Fix attachments collection view sizing

This reverts commit f4b51c06c1107cd8149a8e07a0f652ac6816ee3a.

NotificationExtension/NotificationService.swift

@@ -371,13 +371,14 @@ private struct HTMLCallbacks: HTMLConversionCallbacks {
         // Converting WebURL to URL is a small but non-trivial expense (since it works by
         // serializing the WebURL as a string and then having Foundation parse it again),
         // so, if available, use the system parser which doesn't require another round trip.
-        if let url = try? URL.ParseStrategy().parse(string) {
+        if #available(iOS 16.0, macOS 13.0, *),
+           let url = try? URL.ParseStrategy().parse(string) {
             url
         } else if let web = WebURL(string),
                   let url = URL(web) {
             url
         } else {
-            nil
+            URL(string: string)
         }
     }
     

Packages/ComposeUI/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "ComposeUI",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
@@ -20,13 +20,24 @@ let package = Package(
         .package(path: "../InstanceFeatures"),
         .package(path: "../TuskerComponents"),
         .package(path: "../MatchedGeometryPresentation"),
+        .package(path: "../TuskerPreferences"),
+        .package(path: "../UserAccounts"),
+        .package(path: "../GalleryVC"),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
         // Targets can depend on other targets in this package, and on products in packages this package depends on.
         .target(
             name: "ComposeUI",
-            dependencies: ["Pachyderm", "InstanceFeatures", "TuskerComponents", "MatchedGeometryPresentation"],
+            dependencies: [
+                "Pachyderm",
+                "InstanceFeatures",
+                "TuskerComponents",
+                "MatchedGeometryPresentation",
+                "TuskerPreferences",
+                "UserAccounts",
+                "GalleryVC",
+            ],
             swiftSettings: [
                 .swiftLanguageMode(.v5)
             ]),

Packages/ComposeUI/Sources/ComposeUI/API/PostService.swift

@@ -11,7 +11,7 @@ import Pachyderm
 import UniformTypeIdentifiers
 
 @MainActor
-class PostService: ObservableObject {
+final class PostService: ObservableObject {
     private let mastodonController: ComposeMastodonContext
     private let config: ComposeUIConfig
     private let draft: Draft

Packages/ComposeUI/Sources/ComposeUI/CharacterCounter.swift

@@ -12,7 +12,7 @@ import InstanceFeatures
 public struct CharacterCounter {
     
     private static let linkDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
-    private static let mention = try! NSRegularExpression(pattern: "(@[a-z0-9_]+)(?:@[a-z0-9\\-\\.]+[a-z0-9]+)?", options: .caseInsensitive)
+    static let mention = try! NSRegularExpression(pattern: "(@[a-z0-9_]+)(?:@[a-z0-9\\-\\.]+[a-z0-9]+)?", options: .caseInsensitive)
     
     public static func count(text: String, for instanceFeatures: InstanceFeatures) -> Int {
         let mentionsRemoved = removeMentions(in: text)

Packages/ComposeUI/Sources/ComposeUI/ComposeInput.swift

@@ -8,6 +8,7 @@
 import Foundation
 import Combine
 import UIKit
+import SwiftUI
 
 protocol ComposeInput: AnyObject, ObservableObject {
     var toolbarElements: [ToolbarElement] { get }
@@ -27,3 +28,45 @@ enum ToolbarElement {
     case emojiPicker
     case formattingButtons
 }
+
+private struct FocusedComposeInput: FocusedValueKey {
+    typealias Value = (any ComposeInput)?
+}
+
+extension FocusedValues {
+    // double optional is necessary pre-iOS 16
+    var composeInput: (any ComposeInput)?? {
+        get { self[FocusedComposeInput.self] }
+        set { self[FocusedComposeInput.self] = newValue }
+    }
+}
+
+@propertyWrapper
+final class MutableObservableBox<Value>: ObservableObject {
+    @Published var wrappedValue: Value
+    
+    init(wrappedValue: Value) {
+        self.wrappedValue = wrappedValue
+    }
+}
+
+private struct FocusedComposeInputBox: EnvironmentKey {
+    static let defaultValue: MutableObservableBox<(any ComposeInput)?> = .init(wrappedValue: nil)
+}
+
+extension EnvironmentValues {
+    var composeInputBox: MutableObservableBox<(any ComposeInput)?> {
+        get { self[FocusedComposeInputBox.self] }
+        set { self[FocusedComposeInputBox.self] = newValue }
+    }
+}
+
+struct FocusedInputModifier: ViewModifier {
+    @StateObject var box: MutableObservableBox<(any ComposeInput)?> = .init(wrappedValue: nil)
+    
+    func body(content: Content) -> some View {
+        content
+            .environment(\.composeInputBox, box)
+            .focusedValue(\.composeInput, box.wrappedValue)
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/ComposeMastodonContext.swift

@@ -9,6 +9,7 @@ import Foundation
 import Pachyderm
 import InstanceFeatures
 import UserAccounts
+import SwiftUI
 
 public protocol ComposeMastodonContext {
     var accountInfo: UserAccountInfo? { get }
@@ -26,4 +27,6 @@ public protocol ComposeMastodonContext {
     func searchCachedHashtags(query: String) -> [Hashtag]
     
     func storeCreatedStatus(_ status: Status)
+    
+    func fetchStatus(id: String) -> (any StatusProtocol)?
 }

Packages/ComposeUI/Sources/ComposeUI/Controllers/AttachmentRowController.swift

@@ -156,7 +156,7 @@ class AttachmentRowController: ViewController {
                         Button(role: .destructive, action: controller.removeAttachment) {
                             Label("Delete", systemImage: "trash")
                         }
-                    } preview: {
+                    } previewIfAvailable: {
                         ControllerView(controller: { controller.thumbnailController })
                     }
                 

Packages/ComposeUI/Sources/ComposeUI/Controllers/AttachmentThumbnailController.swift

@@ -181,7 +181,7 @@ extension EnvironmentValues {
     }
 }
 
-private struct GIFViewWrapper: UIViewRepresentable {
+struct GIFViewWrapper: UIViewRepresentable {
     typealias UIViewType = GIFImageView
 
     @State var controller: GIFController

Packages/ComposeUI/Sources/ComposeUI/Controllers/AttachmentsListController.swift

@@ -131,7 +131,6 @@ class AttachmentsListController: ViewController {
         @EnvironmentObject private var controller: AttachmentsListController
         @EnvironmentObject private var draft: Draft
         @Environment(\.colorScheme) private var colorScheme
-        @Environment(\.horizontalSizeClass) private var horizontalSizeClass
         
         var body: some View {
             attachmentsList
@@ -214,10 +213,48 @@ fileprivate extension View {
             self
         }
     }
+    
+    @available(iOS, obsoleted: 16.0)
+    @ViewBuilder
+    func sheetOrPopover(isPresented: Binding<Bool>, @ViewBuilder content: @escaping () -> some View) -> some View {
+        if #available(iOS 16.0, *) {
+            self.modifier(SheetOrPopover(isPresented: isPresented, view: content))
+        } else {
+            self.popover(isPresented: isPresented, content: content)
+        }
+    }
+    
+    @available(iOS, obsoleted: 16.0)
+    @ViewBuilder
+    func withSheetDetentsIfAvailable() -> some View {
+        if #available(iOS 16.0, *) {
+            self
+                .presentationDetents([.medium, .large])
+                .presentationDragIndicator(.visible)
+        } else {
+            self
+        }
+    }
+}
+
+@available(iOS 16.0, *)
+fileprivate struct SheetOrPopover<V: View>: ViewModifier {
+    @Binding var isPresented: Bool
+    @ViewBuilder let view: () -> V
+    
+    @Environment(\.horizontalSizeClass) var sizeClass
+    
+    func body(content: Content) -> some View {
+        if sizeClass == .compact {
+            content.sheet(isPresented: $isPresented, content: view)
+        } else {
+            content.popover(isPresented: $isPresented, content: view)
+        }
+    }
 }
 
 @available(visionOS 1.0, *)
-fileprivate struct AttachmentButtonLabelStyle: LabelStyle {
+struct AttachmentButtonLabelStyle: LabelStyle {
     func makeBody(configuration: Configuration) -> some View {
         DefaultLabelStyle().makeBody(configuration: configuration)
             .foregroundStyle(.white)

Packages/ComposeUI/Sources/ComposeUI/Controllers/ComposeController.swift

@@ -125,16 +125,24 @@ public final class ComposeController: ViewController {
         self.toolbarController = ToolbarController(parent: self)
         self.attachmentsListController = AttachmentsListController(parent: self)
         
-        NotificationCenter.default.addObserver(self, selector: #selector(currentInputModeChanged), name: UITextInputMode.currentInputModeDidChangeNotification, object: nil)
+        if #available(iOS 16.0, *) {
+            NotificationCenter.default.addObserver(self, selector: #selector(currentInputModeChanged), name: UITextInputMode.currentInputModeDidChangeNotification, object: nil)
+        }
         NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: DraftsPersistentContainer.shared.viewContext)
     }
     
     public var view: some View {
-        ComposeView(poster: poster)
-            .environment(\.managedObjectContext, DraftsPersistentContainer.shared.viewContext)
-            .environmentObject(draft)
-            .environmentObject(mastodonController.instanceFeatures)
-            .environment(\.composeUIConfig, config)
+        if Preferences.shared.hasFeatureFlag(.composeRewrite) {
+            ComposeUI.ComposeView(draft: draft, mastodonController: mastodonController)
+                .environment(\.currentAccount, currentAccount)
+                .environment(\.composeUIConfig, config)
+        } else {
+            ComposeView(poster: poster)
+                .environment(\.managedObjectContext, DraftsPersistentContainer.shared.viewContext)
+                .environmentObject(draft)
+                .environmentObject(mastodonController.instanceFeatures)
+                .environment(\.composeUIConfig, config)
+        }
     }
     
     @MainActor
@@ -322,6 +330,10 @@ public final class ComposeController: ViewController {
                         ControllerView(controller: { controller.toolbarController })
                         #endif
                     }
+                    #if !os(visionOS)
+                    // on iPadOS15, the toolbar ends up below the keyboard's toolbar without this
+                    .padding(.bottom, keyboardInset)
+                    #endif
                     .transition(.move(edge: .bottom))
                 }
             }
@@ -430,7 +442,7 @@ public final class ComposeController: ViewController {
             }
             .listStyle(.plain)
             #if !os(visionOS)
-            .scrollDismissesKeyboard(.interactively)
+            .scrollDismissesKeyboardInteractivelyIfAvailable()
             #endif
             .disabled(controller.isPosting)
         }
@@ -481,6 +493,19 @@ public final class ComposeController: ViewController {
             .keyboardShortcut(.return, modifiers: .command)
             .disabled(!controller.postButtonEnabled)
         }
+        
+        #if !os(visionOS)
+        @available(iOS, obsoleted: 16.0)
+        private var keyboardInset: CGFloat {
+            if #unavailable(iOS 16.0),
+               UIDevice.current.userInterfaceIdiom == .pad,
+               keyboardReader.isVisible {
+                return ToolbarController.height
+            } else {
+                return 0
+            }
+        }
+        #endif
     }
 }
 

Packages/ComposeUI/Sources/ComposeUI/Controllers/FocusedAttachmentController.swift

@@ -51,11 +51,14 @@ class FocusedAttachmentController: ViewController {
                         .onAppear {
                             player.play()
                         }
-                } else {
+                } else if #available(iOS 16.0, *) {
                     ZoomableScrollView {
                         attachmentView
                             .matchedGeometryDestination(id: attachment.id)
                     }
+                } else {
+                    attachmentView
+                        .matchedGeometryDestination(id: attachment.id)
                 }
                 
                 Spacer(minLength: 0)

Packages/ComposeUI/Sources/ComposeUI/Controllers/PlaceholderController.swift

@@ -17,7 +17,7 @@ final class PlaceholderController: ViewController, PlaceholderViewProvider {
            Date().formatted(date: .numeric, time: .omitted).starts(with: "3") {
             Text("Happy π day!")
         } else if components.month == 4 && components.day == 1 {
-            Text("April Fool's!").rotationEffect(.radians(.pi), anchor: .center)
+            Text("April Fool’s!").rotationEffect(.radians(.pi), anchor: .center)
         } else if components.month == 9 && components.day == 5 {
             // https://weirder.earth/@noracodes/109276419847254552
             // https://retrocomputing.stackexchange.com/questions/14763/what-warning-was-given-on-attempting-to-post-to-usenet-circa-1990
@@ -31,7 +31,7 @@ final class PlaceholderController: ViewController, PlaceholderViewProvider {
                 Text("Any questions?")
             }
         } else {
-            Text("What's on your mind?")
+            Text("What’s on your mind?")
         }
     }
     
@@ -41,7 +41,7 @@ final class PlaceholderController: ViewController, PlaceholderViewProvider {
 }
 
 // exists to provide access to the type alias since the @State property needs it to be explicit
-private protocol PlaceholderViewProvider {
+protocol PlaceholderViewProvider {
     associatedtype PlaceholderView: View
     @ViewBuilder
     static func makePlaceholderView() -> PlaceholderView

Packages/ComposeUI/Sources/ComposeUI/Controllers/PollController.swift

@@ -96,7 +96,7 @@ class PollController: ViewController {
                     .onMove(perform: controller.moveOptions)
                 }
                 .listStyle(.plain)
-                .scrollDisabled(true)
+                .scrollDisabledIfAvailable(true)
                 .frame(height: 44 * CGFloat(poll.options.count))
                 
                 Button(action: controller.addOption) {

Packages/ComposeUI/Sources/ComposeUI/Controllers/ToolbarController.swift

@@ -66,7 +66,7 @@ class ToolbarController: ViewController {
                             }
                     })
             }
-            .scrollDisabled(realWidth ?? 0 <= minWidth ?? 0)
+            .scrollDisabledIfAvailable(realWidth ?? 0 <= minWidth ?? 0)
             .frame(height: ToolbarController.height)
             .frame(maxWidth: .infinity)
             .background(.regularMaterial, ignoresSafeAreaEdges: [.bottom, .leading, .trailing])
@@ -122,7 +122,8 @@ class ToolbarController: ViewController {
                 
                 Spacer()
                 
-                if composeController.mastodonController.instanceFeatures.createStatusWithLanguage {
+                if #available(iOS 16.0, *),
+                   composeController.mastodonController.instanceFeatures.createStatusWithLanguage {
                     LanguagePicker(draftLanguage: $draft.language, hasChangedSelection: $composeController.hasChangedLanguageSelection)
                 }
             }

Packages/ComposeUI/Sources/ComposeUI/CoreData/DraftsPersistentContainer.swift

@@ -170,17 +170,26 @@ public class DraftsPersistentContainer: NSPersistentContainer {
             return
         }
         performBackgroundTask { context in
+            let orphanedAttachmentsReq: NSFetchRequest<any NSFetchRequestResult> = DraftAttachment.fetchRequest()
+            orphanedAttachmentsReq.predicate = NSPredicate(format: "draft == nil")
+            let deleteReq = NSBatchDeleteRequest(fetchRequest: orphanedAttachmentsReq)
+            do {
+                try context.execute(deleteReq)
+            } catch {
+                logger.error("Failed to remove orphaned attachments: \(String(describing: error), privacy: .public)")
+            }
+            
             let allAttachmentsReq = DraftAttachment.fetchRequest()
             allAttachmentsReq.predicate = NSPredicate(format: "fileURL != nil")
             guard let allAttachments = try? context.fetch(allAttachmentsReq) else {
                 return
             }
-            let orphaned = Set(files).subtracting(allAttachments.lazy.compactMap(\.fileURL))
-            for url in orphaned {
+            let orphanedFiles = Set(files).subtracting(allAttachments.lazy.compactMap(\.fileURL))
+            for url in orphanedFiles {
                 do {
                     try FileManager.default.removeItem(at: url)
                 } catch {
-                    logger.error("Failed to remove orphaned attachment: \(String(describing: error), privacy: .public)")
+                    logger.error("Failed to remove orphaned attachment files: \(String(describing: error), privacy: .public)")
                 }
             }
             completion()

Packages/ComposeUI/Sources/ComposeUI/Environment.swift

@@ -0,0 +1,49 @@
+//
+//  Environment.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+import Pachyderm
+
+//@propertyWrapper
+//struct RequiredEnvironment<Value>: DynamicProperty {
+//    private let keyPath: KeyPath<EnvironmentValues, Value?>
+//    @Environment private var value: Value?
+//    
+//    init(_ keyPath: KeyPath<EnvironmentValues, Value?>) {
+//        self.keyPath = keyPath
+//        self._value = Environment(keyPath)
+//    }
+//    
+//    var wrappedValue: Value {
+//        guard let value else {
+//            preconditionFailure("Missing required environment value for \(keyPath)")
+//        }
+//        return value
+//    }
+//}
+
+private struct ComposeMastodonContextKey: EnvironmentKey {
+    static let defaultValue: (any ComposeMastodonContext)? = nil
+}
+
+extension EnvironmentValues {
+    var mastodonController: (any ComposeMastodonContext)? {
+        get { self[ComposeMastodonContextKey.self] }
+        set { self[ComposeMastodonContextKey.self] = newValue }
+    }
+}
+
+private struct CurrentAccountKey: EnvironmentKey {
+    static let defaultValue: (any AccountProtocol)? = nil
+}
+
+extension EnvironmentValues {
+    var currentAccount: (any AccountProtocol)? {
+        get { self[CurrentAccountKey.self] }
+        set { self[CurrentAccountKey.self] = newValue }
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/KeyboardReader.swift

@@ -10,8 +10,8 @@
 import UIKit
 import Combine
 
+@available(iOS, obsoleted: 16.0)
 class KeyboardReader: ObservableObject {
-//    @Published var isVisible = false
     @Published var keyboardHeight: CGFloat = 0
     
     var isVisible: Bool {
@@ -26,14 +26,12 @@ class KeyboardReader: ObservableObject {
     
     @objc func willShow(_ notification: Foundation.Notification) {
         let endFrame = notification.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! CGRect
-//        isVisible = endFrame.height > 72
         keyboardHeight = endFrame.height
     }
     
     @objc func willHide() {
         // sometimes willHide is called during a SwiftUI view update
         DispatchQueue.main.async {
-//            self.isVisible = false
             self.keyboardHeight = 0
         }
     }

Packages/ComposeUI/Sources/ComposeUI/Model/StatusFormat.swift

@@ -9,9 +9,13 @@
 import UIKit
 import Pachyderm
 
-enum StatusFormat: Int, CaseIterable {
+enum StatusFormat: Int, CaseIterable, Identifiable {
     case bold, italics, strikethrough, code
     
+    var id: some Hashable {
+        rawValue
+    }
+    
     func insertionResult(for contentType: StatusContentType) -> FormatInsertionResult? {
         switch contentType {
         case .plain:

Packages/ComposeUI/Sources/ComposeUI/Preferences.swift

@@ -0,0 +1,11 @@
+//
+//  Preferences.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import Foundation
+import TuskerPreferences
+
+typealias Preferences = TuskerPreferences.Preferences

Packages/ComposeUI/Sources/ComposeUI/View+ForwardsCompat.swift

@@ -0,0 +1,55 @@
+//
+//  View+ForwardsCompat.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 3/25/23.
+//
+
+import SwiftUI
+
+extension View {
+    #if os(visionOS)
+    func scrollDisabledIfAvailable(_ disabled: Bool) -> some View {
+        self.scrollDisabled(disabled)
+    }
+    #else
+    @available(iOS, obsoleted: 16.0)
+    @ViewBuilder
+    func scrollDisabledIfAvailable(_ disabled: Bool) -> some View {
+        if #available(iOS 16.0, *) {
+            self.scrollDisabled(disabled)
+        } else {
+            self
+        }
+    }
+    #endif
+    
+    @available(iOS, obsoleted: 16.0)
+    @ViewBuilder
+    func scrollDismissesKeyboardInteractivelyIfAvailable() -> some View {
+        #if os(visionOS)
+        self.scrollDismissesKeyboard(.interactively)
+        #else
+        if #available(iOS 16.0, *) {
+            self.scrollDismissesKeyboard(.interactively)
+        } else {
+            self
+        }
+        #endif
+    }
+    
+    @available(iOS, obsoleted: 16.0)
+    @available(visionOS 1.0, *)
+    @ViewBuilder
+    func contextMenu<M: View, P: View>(@ViewBuilder menuItems: () -> M, @ViewBuilder previewIfAvailable preview: () -> P) -> some View {
+        #if os(visionOS)
+        self.contextMenu(menuItems: menuItems, preview: preview)
+        #else
+        if #available(iOS 16.0, *) {
+            self.contextMenu(menuItems: menuItems, preview: preview)
+        } else {
+            self.contextMenu(menuItems: menuItems)
+        }
+        #endif
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/ViewController.swift

@@ -11,6 +11,7 @@ import Combine
 public protocol ViewController: ObservableObject {
     associatedtype ContentView: View
     
+    @MainActor
     @ViewBuilder
     var view: ContentView { get }
 }

Packages/ComposeUI/Sources/ComposeUI/Views/AttachmentThumbnailView.swift

@@ -0,0 +1,139 @@
+//
+//  AttachmentThumbnailView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 10/14/24.
+//
+
+import SwiftUI
+import TuskerComponents
+import AVFoundation
+import Photos
+
+struct AttachmentThumbnailView: View {
+    let attachment: DraftAttachment
+    var contentMode: ContentMode = .fit
+    
+    var body: some View {
+        AttachmentThumbnailViewContent(attachment: attachment, contentMode: contentMode)
+            .id(attachment.id)
+    }
+    
+}
+
+private struct AttachmentThumbnailViewContent: View {
+    var attachment: DraftAttachment
+    var contentMode: ContentMode = .fit
+    @State private var mode: Mode = .empty
+    @EnvironmentObject private var composeController: ComposeController
+
+    var body: some View {
+        switch mode {
+        case .empty:
+            Image(systemName: "photo")
+                .imageScale(.large)
+                .foregroundStyle(.gray)
+                .task {
+                    await loadThumbnail()
+                }
+        case .image(let image):
+            Image(uiImage: image)
+                .resizable()
+                .aspectRatio(contentMode: contentMode)
+        case .gifController(let controller):
+            GIFViewWrapper(controller: controller)
+        }
+    }
+    
+    private func loadThumbnail() async {
+        switch attachment.data {
+        case .editing(_, let kind, let url):
+            switch kind {
+            case .image:
+                if let image = await composeController.fetchAttachment(url) {
+                    self.mode = .image(image)
+                }
+                
+            case .video, .gifv:
+                await loadVideoThumbnail(url: url)
+                
+            case .audio, .unknown:
+                break
+            }
+            
+        case .asset(let id):
+            guard let asset = PHAsset.fetchAssets(withLocalIdentifiers: [id], options: nil).firstObject else {
+                return
+            }
+            let isGIF = PHAssetResource.assetResources(for: asset).contains {
+                $0.uniformTypeIdentifier == UTType.gif.identifier
+            }
+            if isGIF {
+                PHImageManager.default().requestImageDataAndOrientation(for: asset, options: nil) { data, typeIdentifier, orientation, info in
+                    guard let data else { return }
+                    if typeIdentifier == UTType.gif.identifier {
+                        self.mode = .gifController(GIFController(gifData: data))
+                    } else if let image = UIImage(data: data) {
+                        self.mode = .image(image)
+                    }
+                }
+            } else {
+                let size = CGSize(width: 80, height: 80)
+                PHImageManager.default().requestImage(for: asset, targetSize: size, contentMode: .aspectFill, options: nil) { image, _ in
+                    if let image {
+                        self.mode = .image(image)
+                    }
+                }
+            }
+            
+        case .drawing(let drawing):
+            self.mode = .image(drawing.imageInLightMode(from: drawing.bounds))
+            
+        case .file(let url, let type):
+            if type.conforms(to: .movie) {
+                await loadVideoThumbnail(url: url)
+            } else if let data = try? Data(contentsOf: url) {
+                if type == .gif {
+                    self.mode = .gifController(GIFController(gifData: data))
+                } else if type.conforms(to: .image) {
+                    if let image = UIImage(data: data),
+                       // using prepareThumbnail on images from PHPicker results in extremely high memory usage,
+                       // crashing share extension. see FB12186346
+                       let prepared = await image.byPreparingForDisplay() {
+                        self.mode = .image(prepared)
+                    }
+                }
+            }
+            
+        case .none:
+            break
+        }
+    }
+    
+    private func loadVideoThumbnail(url: URL) async {
+        let asset = AVURLAsset(url: url)
+        let imageGenerator = AVAssetImageGenerator(asset: asset)
+        imageGenerator.appliesPreferredTrackTransform = true
+        #if os(visionOS)
+        if let (cgImage, _) = try? await imageGenerator.image(at: .zero) {
+            self.mode = .image(UIImage(cgImage: cgImage))
+        }
+        #else
+        if #available(iOS 16.0, *) {
+            if let (cgImage, _) = try? await imageGenerator.image(at: .zero) {
+                self.mode = .image(UIImage(cgImage: cgImage))
+            }
+        } else {
+            if let cgImage = try? imageGenerator.copyCGImage(at: .zero, actualTime: nil) {
+                self.mode = .image(UIImage(cgImage: cgImage))
+            }
+        }
+        #endif
+    }
+    
+    enum Mode {
+        case empty
+        case image(UIImage)
+        case gifController(GIFController)
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentCollectionViewCell.swift

@@ -0,0 +1,158 @@
+//
+//  AttachmentCollectionViewCell.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/20/24.
+//
+
+import UIKit
+import SwiftUI
+
+struct AttachmentCollectionViewCellView: View {
+    let attachment: DraftAttachment?
+    
+    var body: some View {
+        if let attachment {
+            AttachmentThumbnailView(attachment: attachment, contentMode: .fill)
+                .squareFrame()
+                .background {
+                    RoundedSquare(cornerRadius: 5)
+                        .fill(.quaternary)
+                }
+                .overlay(alignment: .bottom) {
+                    AttachmentDescriptionLabel(attachment: attachment)
+                }
+                .overlay(alignment: .topTrailing) {
+                    AttachmentRemoveButton(attachment: attachment)
+                }
+                .clipShape(RoundedSquare(cornerRadius: 5))
+        }
+    }
+    
+}
+
+private struct AttachmentRemoveButton: View {
+    let attachment: DraftAttachment
+    
+    var body: some View {
+        Button("Remove", systemImage: "xmark.circle.fill") {
+            let draft = attachment.draft
+            let attachments = draft.attachments.mutableCopy() as! NSMutableOrderedSet
+            attachments.remove(attachment)
+            draft.attachments = attachments
+            DraftsPersistentContainer.shared.viewContext.delete(attachment)
+        }
+        .labelStyle(.iconOnly)
+        .imageScale(.large)
+        .foregroundStyle(.white)
+        .shadow(radius: 2)
+        .padding([.top, .trailing], 2)
+    }
+}
+
+private struct AttachmentDescriptionLabel: View {
+    @ObservedObject var attachment: DraftAttachment
+    
+    var body: some View {
+        ZStack(alignment: .bottomLeading) {
+            LinearGradient(
+                stops: [.init(color: .clear, location: 0), .init(color: .clear, location: 0.6), .init(color: .black.opacity(0.5), location: 1)],
+                startPoint: .top,
+                endPoint: .bottom
+            )
+            
+            label
+                .foregroundStyle(.white)
+                .shadow(color: .black.opacity(0.5), radius: 1)
+                .padding([.horizontal, .bottom], 4)
+        }
+    }
+    
+    @ViewBuilder
+    private var label: some View {
+        if attachment.attachmentDescription.isEmpty {
+            Label("Add alt", systemImage: "pencil")
+                .labelStyle(NarrowSpacingLabelStyle())
+                .font(.callout)
+                .lineLimit(1)
+        } else {
+            Text(attachment.attachmentDescription)
+                .font(.caption)
+                .lineLimit(2)
+        }
+    }
+}
+
+private struct NarrowSpacingLabelStyle: LabelStyle {
+    func makeBody(configuration: Configuration) -> some View {
+        HStack(spacing: 4) {
+            configuration.icon
+            configuration.title
+        }
+    }
+}
+
+private struct RoundedSquare: Shape {
+    let cornerRadius: CGFloat
+    
+    nonisolated func path(in rect: CGRect) -> Path {
+        let minDimension = min(rect.width, rect.height)
+        let square = CGRect(x: rect.minX - (rect.width - minDimension) / 2, y: rect.minY - (rect.height - minDimension), width: minDimension, height: minDimension)
+        return RoundedRectangle(cornerRadius: cornerRadius).path(in: square)
+    }
+}
+
+@available(iOS 16.0, *)
+private struct SquareFrame: Layout {
+    func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
+        precondition(subviews.count == 1)
+        let size = proposal.replacingUnspecifiedDimensions(by: subviews[0].sizeThatFits(proposal))
+        let minDimension = min(size.width, size.height)
+        return CGSize(width: minDimension, height: minDimension)
+    }
+    
+    func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
+        precondition(subviews.count == 1)
+        let subviewSize = subviews[0].sizeThatFits(proposal)
+        let minDimension = min(bounds.width, bounds.height)
+        let origin = CGPoint(x: bounds.minX - (subviewSize.width - minDimension) / 2, y: bounds.minY - (subviewSize.height - minDimension) / 2)
+        subviews[0].place(at: origin, proposal: ProposedViewSize(subviewSize))
+    }
+}
+
+#if !os(visionOS)
+@available(iOS, obsoleted: 16.0)
+private struct LegacySquareFrame<Content: View>: View {
+    @ViewBuilder let content: Content
+    
+    var body: some View {
+        GeometryReader { proxy in
+            let minDimension = min(proxy.size.width, proxy.size.height)
+            content
+                .frame(width: minDimension, height: minDimension, alignment: .center)
+        }
+    }
+}
+#endif
+
+private extension View {
+    @ViewBuilder
+    func squareFrame() -> some View {
+        #if os(visionOS)
+        SquareFrame {
+            self
+        }
+        #else
+        if #available(iOS 16.0, *) {
+            SquareFrame {
+                self
+            }
+        } else {
+            LegacySquareFrame {
+                self
+            }
+        }
+        #endif
+    }
+}
+

Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsGalleryDataSource.swift

@@ -0,0 +1,90 @@
+//
+//  AttachmentGalleryDataSource.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/21/24.
+//
+
+import UIKit
+import GalleryVC
+import TuskerComponents
+import Photos
+
+struct AttachmentsGalleryDataSource: GalleryDataSource {
+    let collectionView: UICollectionView
+    let attachmentAtIndex: (Int) -> DraftAttachment?
+    
+    func galleryItemsCount() -> Int {
+        collectionView.numberOfItems(inSection: 0) - 1
+    }
+    
+    func galleryContentViewController(forItemAt index: Int) -> any GalleryVC.GalleryContentViewController {
+        let attachment = attachmentAtIndex(index)!
+        
+        let content: any GalleryContentViewController
+        switch attachment.data {
+        case .editing(_, _, _):
+            fatalError("TODO")
+            
+        case .asset(let id):
+            content = LoadingGalleryContentViewController(caption: nil) {
+                if let (image, gifData) = await fetchImageAndGIFData(assetID: id) {
+                    let gifController = gifData.map(GIFController.init)
+                    return ImageGalleryContentViewController(image: image, caption: nil, gifController: gifController)
+                } else {
+                    return nil
+                }
+            }
+            
+        case .drawing(let drawing):
+            let image = drawing.imageInLightMode(from: drawing.bounds)
+            content = ImageGalleryContentViewController(image: image, caption: nil, gifController: nil)
+            
+        case .file(let url, let type):
+            if type.conforms(to: .movie) {
+                content = VideoGalleryContentViewController(url: url, caption: nil)
+            } else if type.conforms(to: .image),
+                      let data = try? Data(contentsOf: url),
+                      let image = UIImage(data: data) {
+                let gifController = type == .gif ? GIFController(gifData: data) : nil
+                content = ImageGalleryContentViewController(image: image, caption: nil, gifController: gifController)
+            } else {
+                return LoadingGalleryContentViewController(caption: nil) {
+                    nil
+                }
+            }
+            
+        case .none:
+            return LoadingGalleryContentViewController(caption: nil) {
+                nil
+            }
+        }
+        
+        return EditAttachmentWrapperGalleryContentViewController(draftAttachment: attachment, wrapped: content)
+    }
+    
+    func galleryContentTransitionSourceView(forItemAt index: Int) -> UIView? {
+        collectionView.cellForItem(at: IndexPath(item: index, section: 0))
+    }
+    
+    private func fetchImageAndGIFData(assetID id: String) async -> (UIImage, Data?)? {
+        guard let asset = PHAsset.fetchAssets(withLocalIdentifiers: [id], options: nil).firstObject else {
+            return nil
+        }
+        let (type, data) = await withCheckedContinuation { continuation in
+            PHImageManager.default().requestImageDataAndOrientation(for: asset, options: nil) { data, typeIdentifier, orientation, info in
+                continuation.resume(returning: (typeIdentifier, data))
+            }
+        }
+        guard let data,
+              let image = UIImage(data: data) else {
+            return nil
+        }
+        if type == UTType.gif.identifier {
+            return (image, data)
+        } else {
+            return (image, nil)
+        }
+    }
+    
+}

Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsSection.swift

@@ -0,0 +1,529 @@
+//
+//  AttachmentsSection.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/17/24.
+//
+
+import SwiftUI
+import PhotosUI
+import PencilKit
+import GalleryVC
+import InstanceFeatures
+
+struct AttachmentsSection: View {
+    @ObservedObject var draft: Draft
+    private let spacing: CGFloat = 8
+    private let minItemSize: CGFloat = 100
+    
+    var body: some View {
+        #if os(visionOS)
+        collectionView
+        #else
+        if #available(iOS 16.0, *) {
+            collectionView
+        } else {
+            LegacyCollectionViewSizingView {
+                collectionView
+            } computeHeight: { width in
+                WrappedCollectionView.totalHeight(width: width, minItemSize: minItemSize, spacing: spacing, items: draft.attachments.count + 1)
+            }
+        }
+        #endif
+    }
+    
+    private var collectionView: some View {
+        WrappedCollectionView(
+            draft: draft,
+            spacing: spacing,
+            minItemSize: minItemSize
+        )
+        // Impose a minimum height, because otherwise it defaults to zero which prevents the collection
+        // view from laying out, and leaving the intrinsic content size at zero too.
+        // Add 4 to the minItemSize because otherwise drag-and-drop while reordering can alter the contentOffset by that much.
+        .frame(minHeight: minItemSize + 4)
+    }
+    
+    static func insertAttachments(in draft: Draft, at index: Int, itemProviders: [NSItemProvider]) {
+        for provider in itemProviders where provider.canLoadObject(ofClass: DraftAttachment.self) {
+            provider.loadObject(ofClass: DraftAttachment.self) { object, error in
+                guard let attachment = object as? DraftAttachment else { return }
+                DispatchQueue.main.async {
+                    DraftsPersistentContainer.shared.viewContext.insert(attachment)
+                    attachment.draft = draft
+                    draft.attachments.add(attachment)
+                }
+            }
+        }
+    }
+}
+
+#if !os(visionOS)
+@available(iOS, obsoleted: 16.0)
+private struct LegacyCollectionViewSizingView<Content: View>: View {
+    @ViewBuilder let content: Content
+    let computeHeight: (CGFloat) -> CGFloat
+    @State private var width: CGFloat = 0
+
+    var body: some View {
+        let height = computeHeight(width)
+        
+        content
+            .frame(height: max(height, 10))
+            .overlay {
+                GeometryReader { proxy in
+                    Color.clear
+                        .preference(key: WidthPrefKey.self, value: proxy.size.width)
+                        .onPreferenceChange(WidthPrefKey.self) {
+                            width = $0
+                        }
+                }
+            }
+    }
+}
+
+private struct WidthPrefKey: PreferenceKey {
+    static var defaultValue: CGFloat { 0 }
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        let next = nextValue()
+        if next != 0 {
+            value = next
+        }
+    }
+}
+#endif
+
+// Use a UIViewControllerRepresentable so we have something from which to present the gallery VC.
+private struct WrappedCollectionView: UIViewControllerRepresentable {
+    @ObservedObject var draft: Draft
+    let spacing: CGFloat
+    let minItemSize: CGFloat
+    
+    func makeUIViewController(context: Context) -> WrappedCollectionViewController {
+        WrappedCollectionViewController(spacing: spacing, minItemSize: minItemSize)
+    }
+    
+    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
+        uiViewController.draft = draft
+        uiViewController.addAttachment = {
+            DraftsPersistentContainer.shared.viewContext.insert($0)
+            $0.draft = draft
+            draft.attachments.add($0)
+        }
+        uiViewController.updateAttachments()
+    }
+    
+    @available(iOS 16.0, *)
+    func sizeThatFits(_ proposal: ProposedViewSize, uiViewController: WrappedCollectionViewController, context: Context) -> CGSize? {
+        guard let width = proposal.width,
+              width.isFinite else {
+            return nil
+        }
+        let count = draft.attachments.count + 1
+        return CGSize(
+            width: width,
+            height: Self.totalHeight(width: width, minItemSize: minItemSize, spacing: spacing, items: count)
+        )
+    }
+
+    fileprivate static func itemSize(width: CGFloat, minItemSize: CGFloat, spacing: CGFloat) -> (CGFloat, Int) {
+        // The maximum item size is 2*minItemSize + spacing - 1,
+        // in the case where one item fits in the row but we are one pt short of
+        // adding a second item.
+        var itemSize = minItemSize
+        var fittingCount = floor((width + spacing) / (itemSize + spacing))
+        var usedSpaceForFittingCount = fittingCount * itemSize + (fittingCount - 1) * spacing
+        var remainingSpace = width - usedSpaceForFittingCount
+        if fittingCount == 0 {
+            return (0, 0)
+        } else if fittingCount == 1 && remainingSpace > minItemSize / 2 {
+            // If there's only one item that would fit at min size, and giving
+            // it the rest of the space would increase it by at least 50%,
+            // add a second item anywyas.
+            itemSize = (width - spacing) / 2
+            fittingCount = 2
+            usedSpaceForFittingCount = fittingCount * itemSize + (fittingCount - 1) * spacing
+            remainingSpace = width - usedSpaceForFittingCount
+        }
+        itemSize = itemSize + remainingSpace / fittingCount
+        return (itemSize, Int(fittingCount))
+    }
+    
+    fileprivate static func totalHeight(width: CGFloat, minItemSize: CGFloat, spacing: CGFloat, items: Int) -> CGFloat {
+        let (size, itemsPerRow) = itemSize(width: width, minItemSize: minItemSize, spacing: spacing)
+        guard itemsPerRow != 0 else {
+            return 0
+        }
+        let rows = ceil(Double(items) / Double(itemsPerRow))
+        return size * rows + spacing * (rows - 1)
+    }
+}
+
+private class WrappedCollectionViewController: UIViewController {
+    let spacing: CGFloat
+    let minItemSize: CGFloat
+    var draft: Draft!
+    private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
+    fileprivate var currentInteractiveMoveStartOffsetInCell: CGPoint?
+    fileprivate var currentInteractiveMoveCell: HostingCollectionViewCell?
+    fileprivate var addAttachment: ((DraftAttachment) -> Void)? = nil
+    
+    var collectionView: UICollectionView {
+        view as! UICollectionView
+    }
+    
+    init(spacing: CGFloat, minItemSize: CGFloat) {
+        self.spacing = spacing
+        self.minItemSize = minItemSize
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func loadView() {
+        let layout = UICollectionViewCompositionalLayout { [unowned self] section, environment in
+            let (itemSize, itemsPerRow) = WrappedCollectionView.itemSize(width: environment.container.contentSize.width, minItemSize: minItemSize, spacing: spacing)
+            
+            let items = Array(repeating: NSCollectionLayoutItem(layoutSize: .init(widthDimension: .absolute(itemSize), heightDimension: .absolute(itemSize))), count: itemsPerRow)
+            let group = NSCollectionLayoutGroup.horizontal(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .absolute(itemSize)), subitems: items)
+            group.interItemSpacing = .fixed(spacing)
+            let section = NSCollectionLayoutSection(group: group)
+            section.interGroupSpacing = spacing
+            return section
+        }
+        let attachmentCell = UICollectionView.CellRegistration<HostingCollectionViewCell, DraftAttachment> { [unowned self] cell, indexPath, attachment in
+            cell.containingViewController = self
+            cell.setView(AttachmentCollectionViewCellView(attachment: attachment))
+        }
+        let addButtonCell = UICollectionView.CellRegistration<HostingCollectionViewCell, Bool> { [unowned self] cell, indexPath, item in
+            cell.containingViewController = self
+            cell.setView(AddAttachmentButton(viewController: self, enabled: item))
+        }
+        let collectionView = IntrinsicContentSizeCollectionView(frame: .zero, collectionViewLayout: layout)
+        self.view = collectionView
+        dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
+            switch itemIdentifier {
+            case .attachment(let attachment):
+                return collectionView.dequeueConfiguredReusableCell(using: attachmentCell, for: indexPath, item: attachment)
+            case .addButton:
+                return collectionView.dequeueConfiguredReusableCell(using: addButtonCell, for: indexPath, item: true)
+            }
+        }
+        dataSource.reorderingHandlers.canReorderItem = { item in
+            switch item {
+            case .attachment(_):
+                true
+            case .addButton:
+                false
+            }
+        }
+        dataSource.reorderingHandlers.didReorder = { [unowned self] transaction in
+            let attachmentChanges = transaction.difference.map {
+                switch $0 {
+                case .insert(let offset, let element, let associatedWith):
+                    guard case .attachment(let attachment) = element else { fatalError() }
+                    return CollectionDifference<DraftAttachment>.Change.insert(offset: offset, element: attachment, associatedWith: associatedWith)
+                case .remove(let offset, let element, let associatedWith):
+                    guard case .attachment(let attachment) = element else { fatalError() }
+                    return CollectionDifference<DraftAttachment>.Change.remove(offset: offset, element: attachment, associatedWith: associatedWith)
+                }
+            }
+            let attachmentsDiff = CollectionDifference(attachmentChanges)!
+            let array = draft.draftAttachments.applying(attachmentsDiff)!
+            draft.attachments = NSMutableOrderedSet(array: array)
+        }
+        
+        collectionView.isScrollEnabled = false
+        collectionView.clipsToBounds = false
+        collectionView.delegate = self
+        
+        let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(reorderingLongPressRecognized))
+        longPressRecognizer.delegate = self
+        collectionView.addGestureRecognizer(longPressRecognizer)
+    }
+    
+    func updateAttachments() {
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.all])
+        snapshot.appendItems(draft.draftAttachments.map { .attachment($0) })
+        snapshot.appendItems([.addButton])
+        dataSource.apply(snapshot)
+    }
+    
+    @objc func reorderingLongPressRecognized(_ recognizer: UILongPressGestureRecognizer) {
+        let collectionView = recognizer.view as! UICollectionView
+        switch recognizer.state {
+        case .began:
+            break
+        case .changed:
+            var pos = recognizer.location(in: collectionView)
+            if let currentInteractiveMoveStartOffsetInCell {
+                pos.x -= currentInteractiveMoveStartOffsetInCell.x
+                pos.y -= currentInteractiveMoveStartOffsetInCell.y
+            }
+            collectionView.updateInteractiveMovementTargetPosition(pos)
+        case .ended:
+            collectionView.endInteractiveMovement()
+            UIView.animate(withDuration: 0.2) {
+                self.currentInteractiveMoveCell?.hostView?.transform = .identity
+            }
+            currentInteractiveMoveCell = nil
+            currentInteractiveMoveStartOffsetInCell = nil
+        case .cancelled:
+            collectionView.cancelInteractiveMovement()
+            UIView.animate(withDuration: 0.2) {
+                self.currentInteractiveMoveCell?.hostView?.transform = .identity
+            }
+            currentInteractiveMoveCell = nil
+            currentInteractiveMoveStartOffsetInCell = nil
+        default:
+            break
+        }
+    }
+    
+    enum Section {
+        case all
+    }
+    
+    enum Item: Hashable {
+        case attachment(DraftAttachment)
+        case addButton
+    }
+}
+
+extension WrappedCollectionViewController: UIGestureRecognizerDelegate {
+    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
+        let collectionView = gestureRecognizer.view as! UICollectionView
+        let location = gestureRecognizer.location(in: collectionView)
+        guard let indexPath = collectionView.indexPathForItem(at: location),
+              let cell = collectionView.cellForItem(at: indexPath) as? HostingCollectionViewCell else {
+            return false
+        }
+        guard collectionView.beginInteractiveMovementForItem(at: indexPath) else {
+            return false
+        }
+        UIView.animate(withDuration: 0.2) {
+            cell.hostView?.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
+        }
+        currentInteractiveMoveCell = cell
+        currentInteractiveMoveStartOffsetInCell = gestureRecognizer.location(in: cell)
+        currentInteractiveMoveStartOffsetInCell!.x -= cell.bounds.midX
+        currentInteractiveMoveStartOffsetInCell!.y -= cell.bounds.midY
+        return true
+    }
+}
+
+extension WrappedCollectionViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, targetIndexPathForMoveOfItemFromOriginalIndexPath originalIndexPath: IndexPath, atCurrentIndexPath currentIndexPath: IndexPath, toProposedIndexPath proposedIndexPath: IndexPath) -> IndexPath {
+        let snapshot = dataSource.snapshot()
+        let items = snapshot.itemIdentifiers(inSection: .all).count
+        if proposedIndexPath.row == items - 1 {
+            return IndexPath(item: items - 2, section: proposedIndexPath.section)
+        } else {
+            return proposedIndexPath
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        guard case .attachment(_) = dataSource.itemIdentifier(for: indexPath) else {
+            return
+        }
+        let dataSource = AttachmentsGalleryDataSource(collectionView: collectionView) { [dataSource] in
+            let item = dataSource?.itemIdentifier(for: IndexPath(item: $0, section: 0))
+            switch item {
+            case .attachment(let attachment):
+                return attachment
+            default:
+                return nil
+            }
+        }
+        let galleryVC = GalleryViewController(dataSource: dataSource, initialItemIndex: indexPath.item)
+        galleryVC.showShareButton = false
+        present(galleryVC, animated: true)
+    }
+}
+
+private final class IntrinsicContentSizeCollectionView: UICollectionView {
+    private var _intrinsicContentSize = CGSize.zero
+    
+    override var intrinsicContentSize: CGSize {
+        _intrinsicContentSize
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        if contentSize != _intrinsicContentSize {
+            _intrinsicContentSize = contentSize
+            invalidateIntrinsicContentSize()
+        }
+    }
+}
+
+#if os(visionOS)
+private class HostingCollectionViewCell: UICollectionViewCell {
+    private(set) var hostView: UIView?
+    
+    func setView<V: View>(_ view: V) {
+        let config = UIHostingConfiguration(content: {
+            view
+        }).margins(.all, 0)
+        
+        if let hostView = hostView as? UIContentView {
+            hostView.configuration = config
+        } else {
+            hostView = config.makeContentView()
+            hostView!.frame = contentView.bounds
+            contentView.addSubview(hostView!)
+        }
+    }
+}
+#else
+@available(iOS, obsoleted: 16.0)
+private class HostingCollectionViewCell: UICollectionViewCell {
+    weak var containingViewController: UIViewController?
+    
+    @available(iOS, obsoleted: 16.0)
+    private var hostController: UIHostingController<AnyView>?
+    private(set) var hostView: UIView?
+    
+    func setView<V: View>(_ view: V) {
+        if #available(iOS 16.0, *) {
+            let config = UIHostingConfiguration(content: {
+                view
+            }).margins(.all, 0)
+            
+            // We don't just use the cell's contentConfiguration property because we need to animate
+            // the size of the host view, and when the host view is the contentView, that doesn't work.
+            if let hostView = hostView as? UIContentView {
+                hostView.configuration = config
+            } else {
+                hostView = config.makeContentView()
+                hostView!.frame = contentView.bounds
+                contentView.addSubview(hostView!)
+            }
+        } else {
+            if let hostController {
+                hostController.rootView = AnyView(view)
+            } else {
+                let host = UIHostingController(rootView: AnyView(view))
+                containingViewController!.addChild(host)
+                host.view.frame = contentView.bounds
+                contentView.addSubview(host.view)
+                host.didMove(toParent: containingViewController!)
+                hostController = host
+                hostView = host.view
+            }
+        }
+    }
+}
+#endif
+
+private struct AddAttachmentButton: View {
+    unowned let viewController: WrappedCollectionViewController
+    let enabled: Bool
+    @Environment(\.composeUIConfig.presentAssetPicker) private var presentAssetPicker
+    @Environment(\.composeUIConfig.presentDrawing) private var presentDrawing
+
+    var body: some View {
+        Menu {
+            if let presentAssetPicker {
+                Button("Add photo or video", systemImage: "photo") {
+                    presentAssetPicker {
+                        let draft = viewController.draft!
+                        AttachmentsSection.insertAttachments(in: draft, at: draft.attachments.count, itemProviders: $0.map(\.itemProvider))
+                    }
+                }
+            }
+            if let presentDrawing {
+                Button("Draw something", systemImage: "hand.draw") {
+                    presentDrawing(PKDrawing()) { drawing in
+                        let draft = viewController.draft!
+                        let attachment = DraftAttachment(context: DraftsPersistentContainer.shared.viewContext)
+                        attachment.id = UUID()
+                        attachment.drawing = drawing
+                        attachment.draft = draft
+                        draft.attachments.add(attachment)
+                    }
+                }
+            }
+        } label: {
+            Image(systemName: iconName)
+                .imageScale(.large)
+                .frame(maxWidth: .infinity, maxHeight: .infinity)
+                .background {
+                    RoundedRectangle(cornerRadius: 5)
+                        .foregroundStyle(.tint.opacity(0.1))
+                    
+                    RoundedRectangle(cornerRadius: 5)
+                        .stroke(.tint, style: StrokeStyle(lineWidth: 2, dash: [5]))
+                }
+        }
+        .disabled(!enabled)
+    }
+    
+    private var iconName: String {
+        if #available(iOS 17.0, *) {
+            "photo.badge.plus"
+        } else {
+            "photo"
+        }
+    }
+}
+
+struct AddAttachmentConditionsModifier: ViewModifier {
+    @ObservedObject var draft: Draft
+    @EnvironmentObject private var instanceFeatures: InstanceFeatures
+    
+    private var canAddAttachment: Bool {
+        if instanceFeatures.mastodonAttachmentRestrictions {
+            return draft.attachments.count < 4
+                && draft.draftAttachments.allSatisfy { $0.type == .image }
+                && draft.poll == nil
+        } else {
+            return true
+        }
+    }
+
+    func body(content: Content) -> some View {
+        content
+            .environment(\.canAddAttachment, canAddAttachment)
+    }
+}
+
+private struct CanAddAttachmentKey: EnvironmentKey {
+    static let defaultValue = false
+}
+
+extension EnvironmentValues {
+    var canAddAttachment: Bool {
+        get { self[CanAddAttachmentKey.self] }
+        set { self[CanAddAttachmentKey.self] = newValue }
+    }
+}
+
+struct DropAttachmentModifier: ViewModifier {
+    let draft: Draft
+    @Environment(\.canAddAttachment) private var canAddAttachment
+    
+    func body(content: Content) -> some View {
+        content
+            .onDrop(of: DraftAttachment.readableTypeIdentifiersForItemProvider, delegate: AttachmentDropDelegate(draft: draft, canAddAttachment: canAddAttachment))
+    }
+}
+
+private struct AttachmentDropDelegate: DropDelegate {
+    let draft: Draft
+    let canAddAttachment: Bool
+    
+    func validateDrop(info: DropInfo) -> Bool {
+        canAddAttachment
+    }
+    
+    func performDrop(info: DropInfo) -> Bool {
+        AttachmentsSection.insertAttachments(in: draft, at: draft.attachments.count, itemProviders: info.itemProviders(for: DraftAttachment.readableTypeIdentifiersForItemProvider))
+        return true
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/EditAttachmentWrapperGalleryContentViewController.swift

@@ -0,0 +1,198 @@
+//
+//  EditAttachmentWrapperGalleryContentViewController.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/22/24.
+//
+
+import UIKit
+import GalleryVC
+
+class EditAttachmentWrapperGalleryContentViewController: UIViewController, GalleryContentViewController {
+    let draftAttachment: DraftAttachment
+    let wrapped: any GalleryContentViewController
+    
+    var container: (any GalleryContentViewControllerContainer)?
+    
+    var contentSize: CGSize {
+        wrapped.contentSize
+    }
+    
+    var activityItemsForSharing: [Any] {
+        wrapped.activityItemsForSharing
+    }
+    
+    var caption: String? {
+        wrapped.caption
+    }
+    
+    private lazy var editDescriptionViewController: EditAttachmentDescriptionViewController = EditAttachmentDescriptionViewController(draftAttachment: draftAttachment, wrapped: wrapped.bottomControlsAccessoryViewController)
+    
+    var bottomControlsAccessoryViewController: UIViewController? {
+        editDescriptionViewController
+    }
+    
+    var insetBottomControlsAccessoryViewControllerToSafeArea: Bool {
+        false
+    }
+    
+    var presentationAnimation: GalleryContentPresentationAnimation {
+        wrapped.presentationAnimation
+    }
+    
+    var hideControlsOnZoom: Bool {
+        false
+    }
+    
+    init(draftAttachment: DraftAttachment, wrapped: any GalleryContentViewController) {
+        self.draftAttachment = draftAttachment
+        self.wrapped = wrapped
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        wrapped.container = container
+        addChild(wrapped)
+        wrapped.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(wrapped.view)
+        NSLayoutConstraint.activate([
+            wrapped.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            wrapped.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            wrapped.view.topAnchor.constraint(equalTo: view.topAnchor),
+            wrapped.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        wrapped.didMove(toParent: self)
+    }
+    
+    func setControlsVisible(_ visible: Bool, animated: Bool, dueToUserInteraction: Bool) {
+        wrapped.setControlsVisible(visible, animated: animated, dueToUserInteraction: dueToUserInteraction)
+        if !visible {
+            editDescriptionViewController.textView?.resignFirstResponder()
+        }
+    }
+    
+    func galleryContentDidAppear() {
+        wrapped.galleryContentDidAppear()
+    }
+    
+    func galleryContentWillDisappear() {
+        wrapped.galleryContentWillDisappear()
+    }
+    
+    func shouldHideControls() -> Bool {
+        if editDescriptionViewController.textView.isFirstResponder {
+            editDescriptionViewController.textView.resignFirstResponder()
+            return false
+        } else {
+            return true
+        }
+    }
+}
+
+private class EditAttachmentDescriptionViewController: UIViewController {
+    private let draftAttachment: DraftAttachment
+    private let wrapped: UIViewController?
+    
+    private(set) var textView: UITextView!
+    private var isShowingPlaceholder = false
+    
+    private var descriptionObservation: NSKeyValueObservation?
+    
+    init(draftAttachment: DraftAttachment, wrapped: UIViewController?) {
+        self.draftAttachment = draftAttachment
+        self.wrapped = wrapped
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.overrideUserInterfaceStyle = .dark
+        view.backgroundColor = .secondarySystemFill
+        
+        let stack = UIStackView()
+        stack.axis = .vertical
+        stack.distribution = .fill
+        stack.spacing = 0
+        stack.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(stack)
+        NSLayoutConstraint.activate([
+            stack.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            stack.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            stack.topAnchor.constraint(equalTo: view.topAnchor),
+            stack.bottomAnchor.constraint(equalTo: view.keyboardLayoutGuide.topAnchor),
+        ])
+
+        if let wrapped {
+            stack.addArrangedSubview(wrapped.view)
+        }
+        
+        textView = UITextView()
+        textView.backgroundColor = nil
+        textView.font = .preferredFont(forTextStyle: .body)
+        textView.adjustsFontForContentSizeCategory = true
+        if draftAttachment.attachmentDescription.isEmpty {
+            showPlaceholder()
+        } else {
+            removePlaceholder()
+            textView.text = draftAttachment.attachmentDescription
+        }
+        textView.delegate = self
+        stack.addArrangedSubview(textView)
+        textView.heightAnchor.constraint(equalToConstant: 150).isActive = true
+        
+        descriptionObservation = draftAttachment.observe(\.attachmentDescription) { [unowned self] _, _ in
+            let desc = self.draftAttachment.attachmentDescription
+            if desc.isEmpty {
+                if !isShowingPlaceholder {
+                    showPlaceholder()
+                }
+            } else {
+                if isShowingPlaceholder {
+                    removePlaceholder()
+                }
+                self.textView.text = desc
+            }
+        }
+    }
+    
+    fileprivate func showPlaceholder() {
+        isShowingPlaceholder = true
+        textView.text = "Describe for the visually impaired"
+        textView.textColor = .secondaryLabel
+    }
+    
+    fileprivate func removePlaceholder() {
+        isShowingPlaceholder = false
+        textView.text = ""
+        textView.textColor = .label
+    }
+}
+
+extension EditAttachmentDescriptionViewController: UITextViewDelegate {
+    func textViewDidBeginEditing(_ textView: UITextView) {
+        if isShowingPlaceholder {
+            removePlaceholder()
+        }
+    }
+    
+    func textViewDidEndEditing(_ textView: UITextView) {
+        draftAttachment.attachmentDescription = textView.text
+        
+        if textView.text.isEmpty {
+            showPlaceholder()
+        }
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/ComposeDraftView.swift

@@ -0,0 +1,59 @@
+//
+//  ComposeDraftView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/16/24.
+//
+
+import SwiftUI
+import Pachyderm
+import TuskerComponents
+
+struct ComposeDraftView: View {
+    @ObservedObject var draft: Draft
+    @FocusState.Binding var focusedField: FocusableField?
+    @Environment(\.currentAccount) private var currentAccount
+    @EnvironmentObject private var controller: ComposeController
+
+    var body: some View {
+        HStack(alignment: .top, spacing: 8) {
+            // TODO: scroll effect?
+            AvatarImageView(
+                url: currentAccount?.avatar,
+                size: 50,
+                style: controller.config.avatarStyle,
+                fetchAvatar: controller.fetchAvatar
+            )
+            .accessibilityHidden(true)
+            
+            VStack(alignment: .leading, spacing: 4) {
+                if let currentAccount {
+                    AccountNameView(account: currentAccount)
+                }
+                
+                ContentWarningTextField(draft: draft, focusedField: $focusedField)
+                
+                DraftContentEditor(draft: draft, focusedField: $focusedField)
+                
+                AttachmentsSection(draft: draft)
+            }
+        }
+    }
+}
+
+private struct AccountNameView: View {
+    let account: any AccountProtocol
+    @EnvironmentObject private var controller: ComposeController
+
+    var body: some View {
+        HStack(spacing: 4) {
+            controller.displayNameLabel(account, .body, 16)
+                .lineLimit(1)
+            
+            Text(verbatim: "@\(account.acct)")
+                .font(.body.weight(.light))
+                .foregroundColor(.secondary)
+                .lineLimit(1)
+        }
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/ComposeToolbarView.swift

@@ -0,0 +1,242 @@
+//
+//  ComposeToolbarView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+import TuskerComponents
+import InstanceFeatures
+import Pachyderm
+import TuskerPreferences
+
+struct ComposeToolbarView: View {
+    static let height: CGFloat = 44
+    
+    @ObservedObject var draft: Draft
+    let mastodonController: any ComposeMastodonContext
+    @FocusState.Binding var focusedField: FocusableField?
+    
+    var body: some View {
+        #if os(visionOS)
+        buttons
+        #else
+        ToolbarScrollView {
+            buttons
+                .padding(.horizontal, 16)
+        }
+        .frame(height: Self.height)
+        .background(.regularMaterial, ignoresSafeAreaEdges: [.bottom, .leading, .trailing])
+        .overlay(alignment: .top) {
+            Divider()
+                .ignoresSafeArea(edges: [.leading, .trailing])
+        }
+        #endif
+    }
+    
+    private var buttons: some View {
+        HStack(spacing: 0) {
+            ContentWarningButton(enabled: $draft.contentWarningEnabled, focusedField: $focusedField)
+            
+            VisibilityButton(draft: draft, instanceFeatures: mastodonController.instanceFeatures)
+            
+            LocalOnlyButton(enabled: $draft.localOnly, mastodonController: mastodonController)
+            
+            InsertEmojiButton()
+            
+            FormatButtons()
+            
+            Spacer()
+        }
+    }
+}
+
+#if !os(visionOS)
+private struct ToolbarScrollView<Content: View>: View {
+    @ViewBuilder let content: Content
+    @State private var minWidth: CGFloat?
+    @State private var realWidth: CGFloat?
+    
+    var body: some View {
+        ScrollView(.horizontal, showsIndicators: false) {
+            content
+                .frame(minWidth: minWidth)
+                .background {
+                    GeometryReader { proxy in
+                        Color.clear
+                            .preference(key: ToolbarWidthPrefKey.self, value: proxy.size.width)
+                            .onPreferenceChange(ToolbarWidthPrefKey.self) {
+                                realWidth = $0
+                            }
+                    }
+                }
+        }
+        .scrollDisabledIfAvailable(realWidth ?? 0 <= minWidth ?? 0)
+        .frame(maxWidth: .infinity)
+        .background {
+            GeometryReader { proxy in
+                Color.clear
+                    .preference(key: ToolbarWidthPrefKey.self, value: proxy.size.width)
+                    .onPreferenceChange(ToolbarWidthPrefKey.self) {
+                        minWidth = $0
+                    }
+            }
+        }
+    }
+}
+#endif
+
+private struct ToolbarWidthPrefKey: SwiftUI.PreferenceKey {
+    static var defaultValue: CGFloat? = nil
+    static func reduce(value: inout CGFloat?, nextValue: () -> CGFloat?) {
+        value = value ?? nextValue()
+    }
+}
+
+private struct ContentWarningButton: View {
+    @Binding var enabled: Bool
+    @FocusState.Binding var focusedField: FocusableField?
+    
+    var body: some View {
+        Button("CW", action: toggleContentWarning)
+            .accessibilityLabel(enabled ? "Remove content warning" : "Add content warning")
+            .padding(5)
+            .hoverEffect()
+    }
+    
+    private func toggleContentWarning() {
+        enabled.toggle()
+        if enabled {
+            focusedField = .contentWarning
+        }
+    }
+}
+
+private struct VisibilityButton: View {
+    @ObservedObject var draft: Draft
+    @ObservedObject var instanceFeatures: InstanceFeatures
+    
+    private var visibilityBinding: Binding<Pachyderm.Visibility> {
+        // On instances that conflate visibliity and local only, we still show two separate controls but don't allow
+        // changing the visibility when local-only.
+        if draft.localOnly,
+           instanceFeatures.localOnlyPostsVisibility {
+            return .constant(.public)
+        } else {
+            return $draft.visibility
+        }
+    }
+    
+    private var visibilityOptions: [MenuPicker<Pachyderm.Visibility>.Option] {
+        let visibilities: [Pachyderm.Visibility]
+        if !instanceFeatures.composeDirectStatuses {
+            visibilities = [.public, .unlisted, .private]
+        } else {
+            visibilities = Pachyderm.Visibility.allCases
+        }
+        return visibilities.map { vis in
+            .init(value: vis, title: vis.displayName, subtitle: vis.subtitle, image: UIImage(systemName: vis.unfilledImageName), accessibilityLabel: "Visibility: \(vis.displayName)")
+        }
+    }
+    
+    var body: some View {
+        MenuPicker(selection: visibilityBinding, options: visibilityOptions, buttonStyle: .iconOnly)
+            #if !targetEnvironment(macCatalyst) && !os(visionOS)
+            // the button has a bunch of extra space by default, but combined with what we add it's too much
+            .padding(.horizontal, -8)
+            #endif
+            .disabled(draft.editedStatusID != nil)
+            .disabled(instanceFeatures.localOnlyPostsVisibility && draft.localOnly)
+    }
+}
+
+private struct LocalOnlyButton: View {
+    @Binding var enabled: Bool
+    var mastodonController: any ComposeMastodonContext
+    @ObservedObject private var instanceFeatures: InstanceFeatures
+    
+    init(enabled: Binding<Bool>, mastodonController: any ComposeMastodonContext) {
+        self._enabled = enabled
+        self.mastodonController = mastodonController
+        self.instanceFeatures = mastodonController.instanceFeatures
+    }
+    
+    private var options: [MenuPicker<Bool>.Option] {
+        let domain = mastodonController.accountInfo!.instanceURL.host!
+        return [
+            .init(value: true, title: "Local-only", subtitle: "Only \(domain)", image: UIImage(named: "link.broken")),
+            .init(value: false, title: "Federated", image: UIImage(systemName: "link")),
+        ]
+    }
+    
+    var body: some View {
+        if mastodonController.instanceFeatures.localOnlyPosts {
+            MenuPicker(selection: $enabled, options: options, buttonStyle: .iconOnly)
+        }
+    }
+}
+
+private struct InsertEmojiButton: View {
+    @FocusedValue(\.composeInput) private var input
+    @ScaledMetric(relativeTo: .body) private var imageSize: CGFloat = 22
+    
+    var body: some View {
+        if input??.toolbarElements.contains(.emojiPicker) == true {
+            Button(action: beginAutocompletingEmoji) {
+                Label("Insert custom emoji", systemImage: "face.smiling")
+            }
+            .labelStyle(.iconOnly)
+            .font(.system(size: imageSize))
+            .padding(5)
+            .hoverEffect()
+            .transition(.opacity.animation(.linear(duration: 0.2)))
+        }
+    }
+    
+    private func beginAutocompletingEmoji() {
+        input??.beginAutocompletingEmoji()
+    }
+}
+
+private struct FormatButtons: View {
+    @FocusedValue(\.composeInput) private var input
+    @PreferenceObserving(\.$statusContentType) private var contentType
+    
+    var body: some View {
+        if let input = input.flatMap(\.self),
+           input.toolbarElements.contains(.formattingButtons),
+           contentType != .plain {
+            
+            Spacer()
+            ForEach(StatusFormat.allCases) { format in
+                FormatButton(format: format, input: input)
+            }
+        }
+    }
+}
+
+private struct FormatButton: View {
+    let format: StatusFormat
+    let input: any ComposeInput
+    @ScaledMetric(relativeTo: .body) private var imageSize: CGFloat = 22
+    
+    var body: some View {
+        Button(action: applyFormat) {
+            Image(systemName: format.imageName)
+                .font(.system(size: imageSize))
+        }
+        .accessibilityLabel(format.accessibilityLabel)
+        .padding(5)
+        .hoverEffect()
+        .transition(.opacity.animation(.linear(duration: 0.2)))
+    }
+    
+    private func applyFormat() {
+        input.applyFormat(format)
+    }
+}
+
+//#Preview {
+//    ComposeToolbarView()
+//}

Packages/ComposeUI/Sources/ComposeUI/Views/ComposeView.swift

@@ -0,0 +1,242 @@
+//
+//  ComposeView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+
+struct ComposeView: View {
+    @ObservedObject var draft: Draft
+    let mastodonController: any ComposeMastodonContext
+    @State private var poster: PostService? = nil
+    @FocusState private var focusedField: FocusableField?
+    @EnvironmentObject private var controller: ComposeController
+    
+    var body: some View {
+        navigation
+            .environmentObject(mastodonController.instanceFeatures)
+    }
+    
+    @ViewBuilder
+    private var navigation: some View {
+        #if os(visionOS)
+        NavigationStack {
+            navigationRoot
+        }
+        #else
+        if #available(iOS 16.0, *) {
+            NavigationStack {
+                navigationRoot
+            }
+        } else {
+            NavigationView {
+                navigationRoot
+            }
+            .navigationViewStyle(.stack)
+        }
+        #endif
+    }
+    
+    private var navigationRoot: some View {
+        ZStack {
+            ScrollView {
+                scrollContent
+            }
+            .scrollDismissesKeyboardInteractivelyIfAvailable()
+            #if !os(visionOS) && !targetEnvironment(macCatalyst)
+            .modifier(ToolbarSafeAreaInsetModifier())
+            #endif
+        }
+        .overlay(alignment: .top) {
+            if let poster {
+                PostProgressView(poster: poster)
+                    .frame(alignment: .top)
+            }
+        }
+        #if !os(visionOS)
+        .overlay(alignment: .bottom, content: {
+            // TODO: during ducking animation, toolbar should move off the botto edge
+            // This needs to be in an overlay, ignoring the keyboard safe area
+            // doesn't work with the safeAreaInset modifier.
+            toolbarView
+                .frame(maxHeight: .infinity, alignment: .bottom)
+                .ignoresSafeArea(.keyboard)
+        })
+        #endif
+        // Have these after the overlays so they barely work instead of not working at all. FB11790805
+        .modifier(DropAttachmentModifier(draft: draft))
+        .modifier(AddAttachmentConditionsModifier(draft: draft))
+        .modifier(NavigationTitleModifier(draft: draft, mastodonController: mastodonController))
+        .navigationBarTitleDisplayMode(.inline)
+        .toolbar {
+            ToolbarActions(draft: draft, controller: controller)
+            #if os(visionOS)
+            ToolbarItem(placement: .bottomOrnament) {
+                toolbarView
+            }
+            #endif
+        }
+    }
+    
+    private var toolbarView: some View {
+        ComposeToolbarView(draft: draft, mastodonController: mastodonController, focusedField: $focusedField)
+    }
+    
+    @ViewBuilder
+    private var scrollContent: some View {
+        VStack(spacing: 8) {
+            NewReplyStatusView(draft: draft, mastodonController: mastodonController)
+            
+            ComposeDraftView(draft: draft, focusedField: $focusedField)
+        }
+        .padding(8)
+    }
+    
+    private func addAttachments(_ itemProviders: [NSItemProvider]) {
+        AttachmentsSection.insertAttachments(in: draft, at: draft.attachments.count, itemProviders: itemProviders)
+    }
+}
+
+private struct NavigationTitleModifier: ViewModifier {
+    let draft: Draft
+    let mastodonController: any ComposeMastodonContext
+    
+    private var navigationTitle: String {
+        if let id = draft.inReplyToID,
+           let status = mastodonController.fetchStatus(id: id) {
+            return "Reply to @\(status.account.acct)"
+        } else if draft.editedStatusID != nil {
+            return "Edit Post"
+        } else {
+            return "New Post"
+        }
+    }
+
+    func body(content: Content) -> some View {
+        content
+            .navigationTitle(navigationTitle)
+            .preference(key: NavigationTitlePreferenceKey.self, value: navigationTitle)
+    }
+}
+
+// Public preference so that the host can read the title.
+public struct NavigationTitlePreferenceKey: PreferenceKey {
+    public static var defaultValue: String? { nil }
+    public static func reduce(value: inout String?, nextValue: () -> String?) {
+        value = value ?? nextValue()
+    }
+}
+
+private struct ToolbarActions: ToolbarContent {
+    @ObservedObject var draft: Draft
+    // Prior to iOS 16, the toolbar content doesn't seem to have access
+    // to the environment form the containing view.
+    let controller: ComposeController
+    
+    var body: some ToolbarContent {
+        ToolbarItem(placement: .cancellationAction) { ToolbarCancelButton(draft: draft) }
+        
+        #if targetEnvironment(macCatalyst)
+        ToolbarItem(placement: .topBarTrailing) { draftsButton }
+        ToolbarItem(placement: .confirmationAction) { postButton }
+        #else
+        ToolbarItem(placement: .confirmationAction) { postOrDraftsButton }
+        #endif
+    }
+    
+    private var draftsButton: some View {
+        Button(action: controller.showDrafts) {
+            Text("Drafts")
+        }
+    }
+    
+    private var postButton: some View {
+        // TODO: don't use the controller for this
+        Button(action: controller.postStatus) {
+            Text(draft.editedStatusID == nil ? "Post" : "Edit")
+        }
+        .keyboardShortcut(.return, modifiers: .command)
+        .disabled(!controller.postButtonEnabled)
+    }
+    
+    #if !targetEnvironment(macCatalyst)
+    @ViewBuilder
+    private var postOrDraftsButton: some View {
+        if draft.hasContent || draft.editedStatusID != nil || !controller.config.allowSwitchingDrafts {
+            postButton
+        } else {
+            draftsButton
+        }
+    }
+    #endif
+}
+
+private struct ToolbarCancelButton: View {
+    let draft: Draft
+    @EnvironmentObject private var controller: ComposeController
+    
+    var body: some View {
+        Button(action: controller.cancel) {
+            Text("Cancel")
+                // otherwise all Buttons in the nav bar are made semibold
+                .font(.system(size: 17, weight: .regular))
+        }
+        .disabled(controller.isPosting)
+        .confirmationDialog("Are you sure?", isPresented: $controller.isShowingSaveDraftSheet) {
+            // edit drafts can't be saved
+            if draft.editedStatusID == nil {
+                Button(action: { controller.cancel(deleteDraft: false) }) {
+                    Text("Save Draft")
+                }
+                Button(role: .destructive, action: { controller.cancel(deleteDraft: true) }) {
+                    Text("Delete Draft")
+                }
+            } else {
+                Button(role: .destructive, action: { controller.cancel(deleteDraft: true) }) {
+                    Text("Cancel Edit")
+                }
+            }
+        }
+    }
+}
+
+enum FocusableField: Hashable {
+    case contentWarning
+    case body
+    case attachmentDescription(UUID)
+    
+    var nextField: FocusableField? {
+        switch self {
+        case .contentWarning:
+            return .body
+        default:
+            return nil
+        }
+    }
+}
+
+#if !os(visionOS) && !targetEnvironment(macCatalyst)
+private struct ToolbarSafeAreaInsetModifier: ViewModifier {
+    @StateObject private var keyboardReader = KeyboardReader()
+    
+    func body(content: Content) -> some View {
+        if #available(iOS 17.0, *) {
+            content
+                .safeAreaPadding(.bottom, keyboardReader.isVisible ? 0 : ComposeToolbarView.height)
+        } else {
+            content
+                .safeAreaInset(edge: .bottom) {
+                    if !keyboardReader.isVisible {
+                        Color.clear.frame(height: ComposeToolbarView.height)
+                    }
+                }
+        }
+    }
+}
+#endif
+
+//#Preview {
+//    ComposeView()
+//}

Packages/ComposeUI/Sources/ComposeUI/Views/ContentWarningTextField.swift

@@ -0,0 +1,38 @@
+//
+//  ContentWarningTextField.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+
+struct ContentWarningTextField: View {
+    @ObservedObject var draft: Draft
+    @FocusState.Binding var focusedField: FocusableField?
+    
+    var body: some View {
+        if draft.contentWarningEnabled {
+            EmojiTextField(
+                text: $draft.contentWarning,
+                placeholder: "Write your warning here",
+                maxLength: nil,
+                // TODO: completely replace this with FocusState
+                becomeFirstResponder: .constant(false),
+                focusNextView: Binding(get: {
+                    false
+                }, set: {
+                    if $0 {
+                        focusedField = .body
+                    }
+                })
+            )
+            .focused($focusedField, equals: .contentWarning)
+            .modifier(FocusedInputModifier())
+        }
+    }
+}
+
+//#Preview {
+//    ContentWarningTextField()
+//}

Packages/ComposeUI/Sources/ComposeUI/Views/DraftContentEditor.swift

@@ -0,0 +1,98 @@
+//
+//  DraftContentEditor.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 11/16/24.
+//
+
+import SwiftUI
+import InstanceFeatures
+
+struct DraftContentEditor: View {
+    @ObservedObject var draft: Draft
+    @FocusState.Binding var focusedField: FocusableField?
+    @Environment(\.colorScheme) private var colorScheme
+    @Environment(\.composeUIConfig.fillColor) private var fillColor
+
+    var body: some View {
+        VStack(spacing: 4) {
+            NewMainTextView(value: $draft.text, focusedField: $focusedField, handleAttachmentDrop: self.addAttachments)
+            
+            HStack(alignment: .firstTextBaseline) {
+                LanguageButton(draft: draft)
+                Spacer()
+                CharactersRemaining(draft: draft)
+                    .padding(.trailing, 4)
+            }
+            .padding(.all.subtracting(.top), 2)
+        }
+        .background {
+            RoundedRectangle(cornerRadius: 5)
+                .fill(colorScheme == .dark ? fillColor : Color(uiColor: .secondarySystemBackground))
+        }
+    }
+    
+    private func addAttachments(_ providers: [NSItemProvider]) {
+        AttachmentsSection.insertAttachments(in: draft, at: draft.attachments.count, itemProviders: providers)
+    }
+}
+
+private struct CharactersRemaining: View {
+    @ObservedObject var draft: Draft
+    @EnvironmentObject var instanceFeatures: InstanceFeatures
+    
+    private var charsRemaining: Int {
+        let limit = instanceFeatures.maxStatusChars
+        let cwCount = draft.contentWarningEnabled ? draft.contentWarning.count : 0
+        return limit - (cwCount + CharacterCounter.count(text: draft.text, for: instanceFeatures))
+    }
+    
+    var body: some View {
+        Text(verbatim: charsRemaining.description)
+            .foregroundStyle(charsRemaining < 0 ? .red : .secondary)
+            .font(.callout.monospacedDigit())
+            .accessibility(label: Text(charsRemaining < 0 ? "\(-charsRemaining) characters too many" : "\(charsRemaining) characters remaining"))
+    }
+}
+
+private struct LanguageButton: View {
+    @ObservedObject var draft: Draft
+    @EnvironmentObject private var instanceFeatures: InstanceFeatures
+    @FocusedValue(\.composeInput) private var input
+    @State private var hasChanged = false
+    
+    var body: some View {
+        if #available(iOS 16.0, *),
+           instanceFeatures.createStatusWithLanguage {
+            LanguagePicker(draftLanguage: $draft.language, hasChangedSelection: $hasChanged)
+                .buttonStyle(LanguageButtonStyle())
+                .onReceive(NotificationCenter.default.publisher(for: UITextInputMode.currentInputModeDidChangeNotification), perform: currentInputModeChanged)
+                .onChange(of: draft.id) { _ in
+                    hasChanged = false
+                }
+        }
+    }
+    
+    @available(iOS 16.0, *)
+    private func currentInputModeChanged(_ notification: Foundation.Notification) {
+        guard !hasChanged,
+              !draft.hasContent,
+              let mode = input??.textInputMode,
+              let code = LanguagePicker.codeFromInputMode(mode) else {
+            return
+        }
+        draft.language = code.identifier
+    }
+}
+
+private struct LanguageButtonStyle: ButtonStyle {
+    func makeBody(configuration: Configuration) -> some View {
+        configuration.label
+            .font(.callout)
+            .foregroundStyle(.tint.opacity(configuration.isPressed ? 0.8 : 1))
+            .padding(.vertical, 2)
+            .padding(.horizontal, 4)
+            .background(.tint.opacity(configuration.isPressed ? 0.15 : 0.2), in: RoundedRectangle(cornerRadius: 3))
+            .animation(.linear(duration: 0.1), value: configuration.isPressed)
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/EmojiTextField.swift

@@ -12,6 +12,7 @@ struct EmojiTextField: UIViewRepresentable {
     
     @EnvironmentObject private var controller: ComposeController
     @Environment(\.colorScheme) private var colorScheme
+    @Environment(\.composeInputBox) private var inputBox
     
     @Binding var text: String
     let placeholder: String
@@ -75,7 +76,11 @@ struct EmojiTextField: UIViewRepresentable {
     }
     
     func makeCoordinator() -> Coordinator {
-        Coordinator(controller: controller, text: $text, focusNextView: focusNextView)
+        let coordinator = Coordinator(controller: controller, text: $text, focusNextView: focusNextView)
+        DispatchQueue.main.async {
+            inputBox.wrappedValue = coordinator
+        }
+        return coordinator
     }
     
     class Coordinator: NSObject, UITextFieldDelegate, ComposeInput {
@@ -113,12 +118,16 @@ struct EmojiTextField: UIViewRepresentable {
         }
         
         func textFieldDidBeginEditing(_ textField: UITextField) {
-            controller.currentInput = self
+            DispatchQueue.main.async {
+                self.controller.currentInput = self
+            }
             autocompleteState = textField.updateAutocompleteState(permittedModes: .emojis)
         }
         
         func textFieldDidEndEditing(_ textField: UITextField) {
-            controller.currentInput = nil
+            DispatchQueue.main.async {
+                self.controller.currentInput = nil
+            }
             autocompleteState = textField.updateAutocompleteState(permittedModes: .emojis)
         }
         

Packages/ComposeUI/Sources/ComposeUI/Views/NewMainTextView.swift

@@ -0,0 +1,286 @@
+//
+//  NewMainTextView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/11/24.
+//
+
+import SwiftUI
+
+struct NewMainTextView: View {
+    static var minHeight: CGFloat { 150 }
+    
+    @Binding var value: String
+    @FocusState.Binding var focusedField: FocusableField?
+    var handleAttachmentDrop: ([NSItemProvider]) -> Void
+    @State private var becomeFirstResponder = true
+    
+    var body: some View {
+        NewMainTextViewRepresentable(value: $value, becomeFirstResponder: $becomeFirstResponder, handleAttachmentDrop: handleAttachmentDrop)
+            .focused($focusedField, equals: .body)
+            .modifier(FocusedInputModifier())
+            .overlay(alignment: .topLeading) {
+                if value.isEmpty {
+                    PlaceholderView()
+                }
+            }
+    }
+}
+
+private struct NewMainTextViewRepresentable: UIViewRepresentable {
+    @Binding var value: String
+    @Binding var becomeFirstResponder: Bool
+    var handleAttachmentDrop: ([NSItemProvider]) -> Void
+    @Environment(\.composeInputBox) private var inputBox
+    @Environment(\.isEnabled) private var isEnabled
+    @Environment(\.colorScheme) private var colorScheme
+    @Environment(\.composeUIConfig.fillColor) private var fillColor
+    @Environment(\.composeUIConfig.useTwitterKeyboard) private var useTwitterKeyboard
+    // TODO: test textSelectionStartsAtBeginning
+    @Environment(\.composeUIConfig.textSelectionStartsAtBeginning) private var textSelectionStartsAtBeginning
+    
+    func makeUIView(context: Context) -> UITextView {
+        // TODO: if we're not doing the pill background, reevaluate whether this version fork is necessary
+        let view = if #available(iOS 16.0, *) {
+            WrappedTextView(usingTextLayoutManager: true)
+        } else {
+            WrappedTextView()
+        }
+        view.addInteraction(UIDropInteraction(delegate: context.coordinator))
+        view.delegate = context.coordinator
+        view.adjustsFontForContentSizeCategory = true
+        view.textContainer.lineBreakMode = .byWordWrapping
+        view.isScrollEnabled = false
+        view.typingAttributes = [
+            .foregroundColor: UIColor.label,
+            .font: UIFontMetrics.default.scaledFont(for: .systemFont(ofSize: 20)),
+        ]
+        view.backgroundColor = nil
+        
+//        view.layer.cornerRadius = 5
+//        view.layer.cornerCurve = .continuous
+//        view.layer.shadowColor = UIColor.black.cgColor
+//        view.layer.shadowOpacity = 0.15
+//        view.layer.shadowOffset = .zero
+//        view.layer.shadowRadius = 1
+        
+        if textSelectionStartsAtBeginning {
+            // Update the text immediately so that the selection isn't invalidated by the text changing.
+            context.coordinator.updateTextViewTextIfNecessary(value, textView: view)
+            view.selectedTextRange = view.textRange(from: view.beginningOfDocument, to: view.beginningOfDocument)
+        }
+        
+        return view
+    }
+    
+    func updateUIView(_ uiView: UIViewType, context: Context) {
+        context.coordinator.value = $value
+        context.coordinator.handleAttachmentDrop = handleAttachmentDrop
+        context.coordinator.updateTextViewTextIfNecessary(value, textView: uiView)
+        
+        uiView.isEditable = isEnabled
+        uiView.keyboardType = useTwitterKeyboard ? .twitter : .default
+//        #if !os(visionOS)
+//        uiView.backgroundColor = colorScheme == .dark ? UIColor(fillColor) : .secondarySystemBackground
+//        #endif
+        
+        // Trying to set this with the @FocusState binding in onAppear results in the
+        // keyboard not appearing until after the sheet presentation animation completes :/
+        if becomeFirstResponder {
+            uiView.becomeFirstResponder()
+            DispatchQueue.main.async {
+                becomeFirstResponder = false
+            }
+        }
+    }
+    
+    func makeCoordinator() -> WrappedTextViewCoordinator {
+        let coordinator = WrappedTextViewCoordinator(value: $value, handleAttachmentDrop: handleAttachmentDrop)
+//        DispatchQueue.main.async {
+//            inputBox.wrappedValue = coordinator
+//        }
+        return coordinator
+    }
+    
+    @available(iOS 16.0, *)
+    func sizeThatFits(_ proposal: ProposedViewSize, uiView: UIViewType, context: Context) -> CGSize? {
+        let width = proposal.width ?? 10
+        let size = uiView.sizeThatFits(CGSize(width: width, height: 0))
+        return CGSize(width: width, height: max(NewMainTextView.minHeight, size.height))
+    }
+}
+
+// laxer than the CharacterCounter regex, because we want to find mentions that are being typed but aren't yet complete (e.g., "@a@b")
+private let mentionRegex = try! NSRegularExpression(pattern: "(@[a-z0-9_]+)(?:@[a-z0-9\\-\\.]+)?", options: .caseInsensitive)
+
+private final class WrappedTextViewCoordinator: NSObject {
+    private static let attachment: NSTextAttachment = {
+        let font = UIFont.systemFont(ofSize: 20)
+        let size = /*1.4 * */font.capHeight
+        let renderer = UIGraphicsImageRenderer(size: CGSize(width: size, height: size))
+        let image = renderer.image { ctx in
+            UIColor.systemRed.setFill()
+            ctx.fill(CGRect(x: 0, y: 0, width: size, height: size))
+        }
+        let attachment = NSTextAttachment(image: image)
+        attachment.bounds = CGRect(x: 0, y: -1, width: size + 2, height: size)
+        attachment.lineLayoutPadding = 1
+        return attachment
+    }()
+    
+    var value: Binding<String>
+    var handleAttachmentDrop: ([NSItemProvider]) -> Void
+    
+    init(value: Binding<String>, handleAttachmentDrop: @escaping ([NSItemProvider]) -> Void) {
+        self.value = value
+        self.handleAttachmentDrop = handleAttachmentDrop
+    }
+    
+    private func plainTextFromAttributed(_ attributedText: NSAttributedString) -> String {
+        attributedText.string.replacingOccurrences(of: "\u{FFFC}", with: "")
+    }
+    
+    private func attributedTextFromPlain(_ text: String) -> NSAttributedString {
+        let str = NSMutableAttributedString(string: text)
+        let mentionMatches = CharacterCounter.mention.matches(in: text, range: NSRange(location: 0, length: str.length))
+        for match in mentionMatches.reversed() {
+            str.insert(NSAttributedString(attachment: Self.attachment), at: match.range.location)
+            let range = NSRange(location: match.range.location, length: match.range.length + 1)
+            str.addAttributes([
+                .mention: true,
+                .foregroundColor: UIColor.tintColor,
+            ], range: range)
+        }
+        return str
+    }
+    
+    func updateTextViewTextIfNecessary(_ text: String, textView: UITextView) {
+        if text != plainTextFromAttributed(textView.attributedText) {
+            textView.attributedText = attributedTextFromPlain(text)
+        }
+    }
+    
+    private func updateAttributes(in textView: UITextView) {
+        let str = NSMutableAttributedString(attributedString: textView.attributedText!)
+        var changed = false
+        var cursorOffset = 0
+        
+        // remove existing mentions that aren't valid
+        str.enumerateAttribute(.mention, in: NSRange(location: 0, length: str.length), options: .reverse) { value, range, stop in
+            var substr = (str.string as NSString).substring(with: range)
+            let hasTextAttachment = substr.unicodeScalars.first == UnicodeScalar(NSTextAttachment.character)
+            if hasTextAttachment {
+                substr = String(substr.dropFirst())
+            }
+            if mentionRegex.numberOfMatches(in: substr, range: NSRange(location: 0, length: substr.utf16.count)) == 0 {
+                changed = true
+                str.removeAttribute(.mention, range: range)
+                str.removeAttribute(.foregroundColor, range: range)
+                if hasTextAttachment {
+                    str.deleteCharacters(in: NSRange(location: range.location, length: 1))
+                    cursorOffset -= 1
+                }
+            }
+        }
+        
+        // add mentions for those missing
+        let mentionMatches = mentionRegex.matches(in: str.string, range: NSRange(location: 0, length: str.length))
+        for match in mentionMatches.reversed() {
+            var attributeRange = NSRange()
+            let attribute = str.attribute(.mention, at: match.range.location, effectiveRange: &attributeRange)
+            // the attribute range should always be one greater than the match range, to account for the text attachment
+            if attribute == nil || attributeRange.length <= match.range.length {
+                changed = true
+                let newAttributeRange: NSRange
+                if attribute == nil {
+                    str.insert(NSAttributedString(attachment: Self.attachment), at: match.range.location)
+                    newAttributeRange = NSRange(location: match.range.location, length: match.range.length + 1)
+                    cursorOffset += 1
+                } else {
+                    newAttributeRange = match.range
+                }
+                str.addAttributes([
+                    .mention: true,
+                    .foregroundColor: UIColor.tintColor,
+                ], range: newAttributeRange)
+            }
+        }
+        
+        if changed {
+            let selection = textView.selectedRange
+            
+            textView.attributedText = str
+            
+            textView.selectedRange = NSRange(location: selection.location + cursorOffset, length: selection.length)
+        }
+    }
+}
+
+extension WrappedTextViewCoordinator: UITextViewDelegate {
+    func textViewDidChange(_ textView: UITextView) {
+        if textView.text.isEmpty {
+            textView.typingAttributes = [
+                .foregroundColor: UIColor.label,
+                .font: UIFontMetrics.default.scaledFont(for: .systemFont(ofSize: 20)),
+            ]
+        } else {
+            updateAttributes(in: textView)
+        }
+        
+        let plain = plainTextFromAttributed(textView.attributedText)
+        if plain != value.wrappedValue {
+            value.wrappedValue = plain
+        }
+    }
+    
+    func textViewDidChangeSelection(_ textView: UITextView) {
+    }
+}
+
+//extension WrappedTextViewCoordinator: ComposeInput {
+//    
+//}
+
+// Because of FB11790805, we can't handle drops for the entire screen.
+// The onDrop modifier also doesn't work when applied to the NewMainTextView.
+// So, manually add the UIInteraction to at least handle that.
+extension WrappedTextViewCoordinator: UIDropInteractionDelegate {
+    func dropInteraction(_ interaction: UIDropInteraction, canHandle session: any UIDropSession) -> Bool {
+        session.canLoadObjects(ofClass: DraftAttachment.self)
+    }
+    func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: any UIDropSession) -> UIDropProposal {
+        UIDropProposal(operation: .copy)
+    }
+    func dropInteraction(_ interaction: UIDropInteraction, performDrop session: any UIDropSession) {
+        handleAttachmentDrop(session.items.map(\.itemProvider))
+    }
+}
+
+private final class WrappedTextView: UITextView {
+}
+
+private extension NSAttributedString.Key {
+    static let mention = NSAttributedString.Key("Tusker.ComposeUI.mention")
+}
+
+private struct PlaceholderView: View {
+    @State private var placeholder: PlaceholderController.PlaceholderView = PlaceholderController.makePlaceholderView()
+    @ScaledMetric private var fontSize = 20
+    
+    private var placeholderOffset: CGSize {
+        #if os(visionOS)
+        CGSize(width: 8, height: 8)
+        #else
+        CGSize(width: 4, height: 8)
+        #endif
+    }
+
+    var body: some View {
+        placeholder
+            .font(.system(size: fontSize))
+            .foregroundStyle(.secondary)
+            .offset(placeholderOffset)
+            .accessibilityHidden(true)
+            .allowsHitTesting(false)
+    }
+}

Packages/ComposeUI/Sources/ComposeUI/Views/PostProgressView.swift

@@ -0,0 +1,21 @@
+//
+//  PostProgressView.swift
+//  ComposeUI
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+
+struct PostProgressView: View {
+    @ObservedObject var poster: PostService
+    
+    var body: some View {
+        // can't use SwiftUI.ProgressView because there's no UIProgressView.Style.bar equivalent, see FB8587149
+        WrappedProgressView(value: poster.currentStep, total: poster.totalSteps)
+    }
+}
+
+//#Preview {
+//    PostProgressView()
+//}

Packages/ComposeUI/Sources/ComposeUI/Views/ReplyStatusView.swift

@@ -132,3 +132,21 @@ private struct AvatarContainerRepresentable<Content: View>: UIViewControllerRepr
         }
     }
 }
+
+struct NewReplyStatusView: View {
+    let draft: Draft
+    let mastodonController: any ComposeMastodonContext
+    
+    var body: some View {
+        if let id = draft.inReplyToID,
+           let status = mastodonController.fetchStatus(id: id) {
+            ReplyStatusView(
+                status: status,
+                rowTopInset: 8,
+                globalFrameOutsideList: .zero
+            )
+            // i don't know why swiftui can't infer this from the status that's passed into the ReplyStatusView changing
+            .id(id)
+        }
+    }
+}

Packages/Duckable/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "Duckable",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/GalleryVC/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "GalleryVC",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.

Packages/GalleryVC/Sources/GalleryVC/Content/VideoControlsViewController.swift

@@ -9,6 +9,15 @@
 import UIKit
 import AVFoundation
 
+@propertyWrapper
+final class Box<T> {
+    var wrappedValue: T
+    
+    init(wrappedValue: T) {
+        self.wrappedValue = wrappedValue
+    }
+}
+
 class VideoControlsViewController: UIViewController {
     private static let formatter: DateComponentsFormatter = {
         let f = DateComponentsFormatter()
@@ -18,6 +27,9 @@ class VideoControlsViewController: UIViewController {
     }()
 
     private let player: AVPlayer
+    #if !os(visionOS)
+    @Box private var playbackSpeed: Float
+    #endif
     
     private lazy var muteButton: MuteButton = {
         let button = MuteButton()
@@ -51,8 +63,13 @@ class VideoControlsViewController: UIViewController {
     
     private lazy var optionsButton = MenuButton { [unowned self] in
         let imageName: String
+        #if os(visionOS)
+        let playbackSpeed = player.defaultRate
+        #else
+        let playbackSpeed = self.playbackSpeed
+        #endif
         if #available(iOS 17.0, *) {
-            switch player.defaultRate {
+            switch playbackSpeed {
             case 0.5:
                 imageName = "gauge.with.dots.needle.0percent"
             case 1:
@@ -68,8 +85,12 @@ class VideoControlsViewController: UIViewController {
             imageName = "speedometer"
         }
         let speedMenu = UIMenu(title: "Playback Speed", image: UIImage(systemName: imageName), children: PlaybackSpeed.allCases.map { speed in
-            UIAction(title: speed.displayName, state: self.player.defaultRate == speed.rate ? .on : .off) { [unowned self] _ in
+            UIAction(title: speed.displayName, state: playbackSpeed == speed.rate ? .on : .off) { [unowned self] _ in
+                #if os(visionOS)
                 self.player.defaultRate = speed.rate
+                #else
+                self.playbackSpeed = speed.rate
+                #endif
                 if self.player.rate > 0 {
                     self.player.rate = speed.rate
                 }
@@ -99,11 +120,20 @@ class VideoControlsViewController: UIViewController {
     private var scrubbingTargetTime: CMTime?
     private var isSeeking = false
     
+    #if os(visionOS)
     init(player: AVPlayer) {
         self.player = player
         
         super.init(nibName: nil, bundle: nil)
     }
+    #else
+    init(player: AVPlayer, playbackSpeed: Box<Float>) {
+        self.player = player
+        self._playbackSpeed = playbackSpeed
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    #endif
     
     required init?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
@@ -187,7 +217,11 @@ class VideoControlsViewController: UIViewController {
     @objc private func scrubbingEnded() {
         scrubbingChanged()
         if wasPlayingWhenScrubbingStarted {
+            #if os(visionOS)
             player.play()
+            #else
+            player.rate = playbackSpeed
+            #endif
         }
     }
     

Packages/GalleryVC/Sources/GalleryVC/Content/VideoGalleryContentViewController.swift

@@ -16,6 +16,11 @@ open class VideoGalleryContentViewController: UIViewController, GalleryContentVi
     public private(set) var item: AVPlayerItem
     public let player: AVPlayer
     
+    #if !os(visionOS)
+    @available(iOS, obsoleted: 16.0, message: "Use AVPlayer.defaultRate")
+    @Box private var playbackSpeed: Float = 1
+    #endif
+    
     private var presentationSizeObservation: NSKeyValueObservation?
     private var statusObservation: NSKeyValueObservation?
     private var rateObservation: NSKeyValueObservation?
@@ -157,7 +162,6 @@ open class VideoGalleryContentViewController: UIViewController, GalleryContentVi
     }
     
     open var activityItemsForSharing: [Any] {
-//        [VideoActivityItemSource(asset: item.asset, url: url)]
         []
     }
     
@@ -165,12 +169,20 @@ open class VideoGalleryContentViewController: UIViewController, GalleryContentVi
         isShowingError ? .fade : .fromSourceViewWithoutSnapshot
     }
     
+    #if os(visionOS)
     private lazy var overlayVC = VideoOverlayViewController(player: player)
+    #else
+    private lazy var overlayVC = VideoOverlayViewController(player: player, playbackSpeed: _playbackSpeed)
+    #endif
     public var contentOverlayAccessoryViewController: UIViewController? {
         overlayVC
     }
     
+    #if os(visionOS)
     public private(set) lazy var bottomControlsAccessoryViewController: UIViewController? = VideoControlsViewController(player: player)
+    #else
+    public private(set) lazy var bottomControlsAccessoryViewController: UIViewController? = VideoControlsViewController(player: player, playbackSpeed: _playbackSpeed)
+    #endif
     
     public func setControlsVisible(_ visible: Bool, animated: Bool, dueToUserInteraction: Bool) {
         if !isShowingError {

Packages/GalleryVC/Sources/GalleryVC/Content/VideoOverlayViewController.swift

@@ -15,6 +15,9 @@ class VideoOverlayViewController: UIViewController {
     private static let pauseImage = UIImage(systemName: "pause.fill")!
 
     private let player: AVPlayer
+    #if !os(visionOS)
+    @Box private var playbackSpeed: Float
+    #endif
     
     private var dimmingView: UIView!
     private var controlsStack: UIStackView!
@@ -23,10 +26,18 @@ class VideoOverlayViewController: UIViewController {
 
     private var rateObservation: NSKeyValueObservation?
     
+    #if os(visionOS)
     init(player: AVPlayer) {
         self.player = player
         super.init(nibName: nil, bundle: nil)
     }
+    #else
+    init(player: AVPlayer, playbackSpeed: Box<Float>) {
+        self.player = player
+        self._playbackSpeed = playbackSpeed
+        super.init(nibName: nil, bundle: nil)
+    }
+    #endif
 
     required init?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
@@ -98,7 +109,11 @@ class VideoOverlayViewController: UIViewController {
             if player.currentTime() >= player.currentItem!.duration {
                 player.seek(to: .zero)
             }
+            #if os(visionOS)
             player.play()
+            #else
+            player.rate = playbackSpeed
+            #endif
         }
     }
     

Packages/GalleryVC/Sources/GalleryVC/GalleryContentViewController.swift

@@ -15,8 +15,11 @@ public protocol GalleryContentViewController: UIViewController {
     var caption: String? { get }
     var contentOverlayAccessoryViewController: UIViewController? { get }
     var bottomControlsAccessoryViewController: UIViewController? { get }
+    var insetBottomControlsAccessoryViewControllerToSafeArea: Bool { get }
     var presentationAnimation: GalleryContentPresentationAnimation { get }
+    var hideControlsOnZoom: Bool { get }
     
+    func shouldHideControls() -> Bool
     func setControlsVisible(_ visible: Bool, animated: Bool, dueToUserInteraction: Bool)
     func galleryContentDidAppear()
     func galleryContentWillDisappear()
@@ -31,10 +34,22 @@ public extension GalleryContentViewController {
         nil
     }
     
+    var insetBottomControlsAccessoryViewControllerToSafeArea: Bool {
+        true
+    }
+
     var presentationAnimation: GalleryContentPresentationAnimation {
         .fromSourceView
     }
     
+    var hideControlsOnZoom: Bool {
+        true
+    }
+    
+    func shouldHideControls() -> Bool {
+        true
+    }
+    
     func setControlsVisible(_ visible: Bool, animated: Bool, dueToUserInteraction: Bool) {
     }
     

Packages/GalleryVC/Sources/GalleryVC/GalleryItemViewController.swift

@@ -45,6 +45,12 @@ class GalleryItemViewController: UIViewController {
     
     private var scrollViewSizeForLastZoomScaleUpdate: CGSize?
     
+    var showShareButton: Bool = true {
+        didSet {
+            shareButton?.isHidden = !showShareButton
+        }
+    }
+    
     override var prefersHomeIndicatorAutoHidden: Bool {
         return !controlsVisible
     }
@@ -66,6 +72,10 @@ class GalleryItemViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         
+        // Need to use the keyboard layout guide in some way in this VC,
+        // otherwise the keyboardLayoutGuide inside the bottom controls accessory view doesn't animate
+        _ = view.keyboardLayoutGuide
+        
         scrollView = UIScrollView()
         scrollView.translatesAutoresizingMaskIntoConstraints = false
         scrollView.delegate = self
@@ -109,6 +119,7 @@ class GalleryItemViewController: UIViewController {
             return UIPointerStyle(effect: .highlight(effect.preview), shape: .roundedRect(button.frame))
         }
         shareButton.preferredBehavioralStyle = .pad
+        shareButton.isHidden = !showShareButton
         shareButton.translatesAutoresizingMaskIntoConstraints = false
         updateShareButton()
         topControlsView.addSubview(shareButton)
@@ -141,12 +152,14 @@ class GalleryItemViewController: UIViewController {
             bottomControlsView.addArrangedSubview(controlsAccessory.view)
             controlsAccessory.didMove(toParent: self)
             
-            // Make sure the controls accessory is within the safe area.
-            let spacer = UIView()
-            bottomControlsView.addArrangedSubview(spacer)
-            let spacerTopConstraint = spacer.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
-            spacerTopConstraint.priority = .init(999)
-            spacerTopConstraint.isActive = true
+            if content.insetBottomControlsAccessoryViewControllerToSafeArea {
+                // Make sure the controls accessory is within the safe area.
+                let spacer = UIView()
+                bottomControlsView.addArrangedSubview(spacer)
+                let spacerTopConstraint = spacer.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
+                spacerTopConstraint.priority = .init(999)
+                spacerTopConstraint.isActive = true
+            }
         }
         
         captionTextView = UITextView()
@@ -210,6 +223,14 @@ class GalleryItemViewController: UIViewController {
         singleTap.require(toFail: doubleTap)
         view.addGestureRecognizer(singleTap)
         view.addGestureRecognizer(doubleTap)
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillUpdate), name: UIResponder.keyboardWillShowNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillUpdate), name: UIResponder.keyboardWillHideNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillUpdate), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
+    }
+    
+    @objc private func keyboardWillUpdate() {
+        updateZoomScale(resetZoom: true)
     }
     
     override func viewSafeAreaInsetsDidChange() {
@@ -332,7 +353,7 @@ class GalleryItemViewController: UIViewController {
             return
         }
         
-        let heightScale = view.bounds.height / content.contentSize.height
+        let heightScale = (view.bounds.height - view.keyboardLayoutGuide.layoutFrame.height) / content.contentSize.height
         let widthScale = view.bounds.width / content.contentSize.width
         let minScale = min(widthScale, heightScale)
         let maxScale = minScale >= 1 ? minScale + 2 : 2
@@ -355,7 +376,7 @@ class GalleryItemViewController: UIViewController {
         
         // Note: use frame for the content.view, because that's in the coordinate space of the scroll view
         // which means it's already been scaled by the zoom factor.
-        let yOffset = max(0, (view.bounds.height - content.view.frame.height) / 2)
+        let yOffset = max(0, (view.bounds.height - view.keyboardLayoutGuide.layoutFrame.height - content.view.frame.height) / 2)
         contentViewTopConstraint!.constant = yOffset
         
         let xOffset = max(0, (view.bounds.width - content.view.frame.width) / 2)
@@ -432,7 +453,9 @@ class GalleryItemViewController: UIViewController {
            scrollView.zoomScale > scrollView.minimumZoomScale {
             animateZoomOut()
         } else {
-            setControlsVisible(!controlsVisible, animated: true, dueToUserInteraction: true)
+            if content.shouldHideControls() {
+                setControlsVisible(!controlsVisible, animated: true, dueToUserInteraction: true)
+            }
         }
     }
     
@@ -551,7 +574,9 @@ extension GalleryItemViewController: UIScrollViewDelegate {
         if scrollView.zoomScale <= scrollView.minimumZoomScale {
             setControlsVisible(true, animated: true, dueToUserInteraction: true)
         } else {
-            setControlsVisible(false, animated: true, dueToUserInteraction: true)
+            if content.hideControlsOnZoom {
+                setControlsVisible(false, animated: true, dueToUserInteraction: true)
+            }
         }
         
         centerContent()

Packages/GalleryVC/Sources/GalleryVC/GalleryViewController.swift

@@ -26,6 +26,14 @@ public class GalleryViewController: UIPageViewController {
     private var dismissInteraction: GalleryDismissInteraction!
     private var presentationAnimationCompletionHandlers: [() -> Void] = []
     
+    public var showShareButton: Bool = true {
+        didSet {
+            if viewControllers?.isEmpty == false {
+                currentItemViewController.showShareButton = showShareButton
+            }
+        }
+    }
+    
     override public var prefersStatusBarHidden: Bool {
         true
     }
@@ -89,7 +97,9 @@ public class GalleryViewController: UIPageViewController {
     
     private func makeItemVC(index: Int) -> GalleryItemViewController {
         let content = galleryDataSource.galleryContentViewController(forItemAt: index)
-        return GalleryItemViewController(delegate: self, itemIndex: index, content: content)
+        let itemVC = GalleryItemViewController(delegate: self, itemIndex: index, content: content)
+        itemVC.showShareButton = showShareButton
+        return itemVC
     }
     
     func presentationAnimationCompleted() {

Packages/GalleryVC/Sources/GalleryVC/UIView+Utilities.swift

@@ -14,7 +14,8 @@ extension UIView {
         while let superview = view.superview {
             if superview.layer.masksToBounds {
                 return superview
-            } else if superview is UIScrollView {
+            } else if let scrollView = superview as? UIScrollView,
+                      scrollView.isScrollEnabled {
                 return self
             } else {
                 view = superview

Packages/InstanceFeatures/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "InstanceFeatures",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/MatchedGeometryPresentation/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "MatchedGeometryPresentation",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.

Packages/Pachyderm/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "Pachyderm",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/PushNotifications/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "PushNotifications",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.

Packages/TTTKit/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "TTTKit",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/TuskerComponents/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "TuskerComponents",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/TuskerComponents/Sources/TuskerComponents/AsyncPicker.swift

@@ -9,14 +9,21 @@ import SwiftUI
 
 public struct AsyncPicker<V: Hashable, Content: View>: View {
     let titleKey: LocalizedStringKey
+    #if !os(visionOS)
+    @available(iOS, obsoleted: 16.0, message: "Switch to LabeledContent")
+    let labelHidden: Bool
+    #endif
     let alignment: Alignment
     @Binding var value: V
     let onChange: (V) async -> Bool
     let content: Content
     @State private var isLoading = false
     
-    public init(_ titleKey: LocalizedStringKey, alignment: Alignment = .center, value: Binding<V>, onChange: @escaping (V) async -> Bool, @ViewBuilder content: () -> Content) {
+    public init(_ titleKey: LocalizedStringKey, labelHidden: Bool = false, alignment: Alignment = .center, value: Binding<V>, onChange: @escaping (V) async -> Bool, @ViewBuilder content: () -> Content) {
         self.titleKey = titleKey
+        #if !os(visionOS)
+        self.labelHidden = labelHidden
+        #endif
         self.alignment = alignment
         self._value = value
         self.onChange = onChange
@@ -24,9 +31,25 @@ public struct AsyncPicker<V: Hashable, Content: View>: View {
     }
     
     public var body: some View {
+        #if os(visionOS)
         LabeledContent(titleKey) {
             picker
         }
+        #else
+        if #available(iOS 16.0, *) {
+            LabeledContent(titleKey) {
+                picker
+            }
+        } else if labelHidden {
+            picker
+        } else {
+            HStack {
+                Text(titleKey)
+                Spacer()
+                picker
+            }
+        }
+        #endif
     }
     
     private var picker: some View {

Packages/TuskerComponents/Sources/TuskerComponents/AsyncToggle.swift

@@ -10,19 +10,42 @@ import SwiftUI
 
 public struct AsyncToggle: View {
     let titleKey: LocalizedStringKey
+    #if !os(visionOS)
+    @available(iOS, obsoleted: 16.0, message: "Switch to LabeledContent")
+    let labelHidden: Bool
+    #endif
     @Binding var mode: Mode
     let onChange: (Bool) async -> Bool
     
-    public init(_ titleKey: LocalizedStringKey, mode: Binding<Mode>, onChange: @escaping (Bool) async -> Bool) {
+    public init(_ titleKey: LocalizedStringKey, labelHidden: Bool = false, mode: Binding<Mode>, onChange: @escaping (Bool) async -> Bool) {
         self.titleKey = titleKey
+        #if !os(visionOS)
+        self.labelHidden = labelHidden
+        #endif
         self._mode = mode
         self.onChange = onChange
     }
     
     public var body: some View {
+        #if os(visionOS)
         LabeledContent(titleKey) {
             toggleOrSpinner
         }
+        #else
+        if #available(iOS 16.0, *) {
+            LabeledContent(titleKey) {
+                toggleOrSpinner
+            }
+        } else if labelHidden {
+            toggleOrSpinner
+        } else {
+            HStack {
+                Text(titleKey)
+                Spacer()
+                toggleOrSpinner
+            }
+        }
+        #endif
     }
     
     @ViewBuilder

Packages/TuskerComponents/Sources/TuskerComponents/MenuPicker.swift

@@ -47,7 +47,9 @@ public struct MenuPicker<Value: Hashable>: UIViewRepresentable {
     
     private func makeConfiguration() -> UIButton.Configuration {
         var config = UIButton.Configuration.borderless()
-        config.indicator = .popup
+        if #available(iOS 16.0, *) {
+            config.indicator = .popup
+        }
         if buttonStyle.hasIcon {
             config.image = selectedOption.image
         }

Packages/TuskerPreferences/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "TuskerPreferences",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.

Packages/TuskerPreferences/Sources/TuskerPreferences/Supporting Types/FeatureFlag.swift

@@ -9,5 +9,6 @@ import Foundation
 
 public enum FeatureFlag: String, Codable {
     case iPadBrowserNavigation = "ipad-browser-navigation"
+    case composeRewrite = "compose-rewrite"
     case pushNotifCustomEmoji = "push-notif-custom-emoji"
 }

Packages/TuskerPreferences/Sources/TuskerPreferences/SwiftUI/PreferenceObserving.swift

@@ -0,0 +1,37 @@
+//
+//  PreferenceObserving.swift
+//  TuskerPreferences
+//
+//  Created by Shadowfacts on 8/10/24.
+//
+
+import SwiftUI
+import Combine
+
+@propertyWrapper
+public struct PreferenceObserving<Key: PreferenceKey>: DynamicProperty {
+    public typealias PrefKeyPath = KeyPath<PreferenceStore, PreferencePublisher<Key>>
+    
+    private let keyPath: PrefKeyPath
+    @StateObject private var observer: Observer
+    
+    public init(_ keyPath: PrefKeyPath) {
+        self.keyPath = keyPath
+        self._observer = StateObject(wrappedValue: Observer(keyPath: keyPath))
+    }
+    
+    public var wrappedValue: Key.Value {
+        Preferences.shared.getValue(preferenceKeyPath: keyPath)
+    }
+    
+    @MainActor
+    private class Observer: ObservableObject {
+        private var cancellable: AnyCancellable?
+        
+        init(keyPath: PrefKeyPath) {
+            cancellable = Preferences.shared[keyPath: keyPath].sink { [unowned self] _ in
+                self.objectWillChange.send()
+            }
+        }
+    }
+}

Packages/UserAccounts/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "UserAccounts",
     platforms: [
-        .iOS(.v16),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

ShareExtension/ShareMastodonContext.swift

@@ -83,4 +83,8 @@ final class ShareMastodonContext: ComposeMastodonContext, ObservableObject, Send
     
     func storeCreatedStatus(_ status: Status) {
     }
+    
+    func fetchStatus(id: String) -> (any StatusProtocol)? {
+        return nil
+    }
 }

Tusker.xcodeproj/project.pbxproj

@@ -141,6 +141,7 @@
 		D64B96812BC3279D002C8990 /* PrefsAccountView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64B96802BC3279D002C8990 /* PrefsAccountView.swift */; };
 		D64B96842BC3893C002C8990 /* PushSubscriptionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64B96832BC3893C002C8990 /* PushSubscriptionView.swift */; };
 		D64D0AB12128D9AE005A6F37 /* OnboardingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64D0AB02128D9AE005A6F37 /* OnboardingViewController.swift */; };
+		D64D8CA92463B494006B0BAA /* MultiThreadDictionary.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64D8CA82463B494006B0BAA /* MultiThreadDictionary.swift */; };
 		D651C5B42915B00400236EF6 /* ProfileFieldsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D651C5B32915B00400236EF6 /* ProfileFieldsView.swift */; };
 		D6531DEE246B81C9000F9538 /* GifvPlayerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6531DED246B81C9000F9538 /* GifvPlayerView.swift */; };
 		D6538945214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */; };
@@ -332,7 +333,7 @@
 		D6D79F592A13293200AB2315 /* BackgroundManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6D79F582A13293200AB2315 /* BackgroundManager.swift */; };
 		D6D94955298963A900C59229 /* Colors.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6D94954298963A900C59229 /* Colors.swift */; };
 		D6D9498D298CBB4000C59229 /* TrendingStatusCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6D9498C298CBB4000C59229 /* TrendingStatusCollectionViewCell.swift */; };
-		D6D9498F298EB79400C59229 /* CopyableLabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6D9498E298EB79400C59229 /* CopyableLabel.swift */; };
+		D6D9498F298EB79400C59229 /* CopyableLable.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6D9498E298EB79400C59229 /* CopyableLable.swift */; };
 		D6DD8FFD298495A8002AD3FD /* LogoutService.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD8FFC298495A8002AD3FD /* LogoutService.swift */; };
 		D6DD8FFF2984D327002AD3FD /* BookmarksViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD8FFE2984D327002AD3FD /* BookmarksViewController.swift */; };
 		D6DD996B2998611A0015C962 /* SuggestedProfilesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD996A2998611A0015C962 /* SuggestedProfilesViewController.swift */; };
@@ -567,6 +568,7 @@
 		D64B96802BC3279D002C8990 /* PrefsAccountView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PrefsAccountView.swift; sourceTree = "<group>"; };
 		D64B96832BC3893C002C8990 /* PushSubscriptionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PushSubscriptionView.swift; sourceTree = "<group>"; };
 		D64D0AB02128D9AE005A6F37 /* OnboardingViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OnboardingViewController.swift; sourceTree = "<group>"; };
+		D64D8CA82463B494006B0BAA /* MultiThreadDictionary.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MultiThreadDictionary.swift; sourceTree = "<group>"; };
 		D651C5B32915B00400236EF6 /* ProfileFieldsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileFieldsView.swift; sourceTree = "<group>"; };
 		D6531DED246B81C9000F9538 /* GifvPlayerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GifvPlayerView.swift; sourceTree = "<group>"; };
 		D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewSwipeActionProvider.swift; sourceTree = "<group>"; };
@@ -768,7 +770,7 @@
 		D6D79F582A13293200AB2315 /* BackgroundManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackgroundManager.swift; sourceTree = "<group>"; };
 		D6D94954298963A900C59229 /* Colors.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Colors.swift; sourceTree = "<group>"; };
 		D6D9498C298CBB4000C59229 /* TrendingStatusCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrendingStatusCollectionViewCell.swift; sourceTree = "<group>"; };
-		D6D9498E298EB79400C59229 /* CopyableLabel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CopyableLabel.swift; sourceTree = "<group>"; };
+		D6D9498E298EB79400C59229 /* CopyableLable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CopyableLable.swift; sourceTree = "<group>"; };
 		D6DD8FFC298495A8002AD3FD /* LogoutService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LogoutService.swift; sourceTree = "<group>"; };
 		D6DD8FFE2984D327002AD3FD /* BookmarksViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BookmarksViewController.swift; sourceTree = "<group>"; };
 		D6DD996A2998611A0015C962 /* SuggestedProfilesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestedProfilesViewController.swift; sourceTree = "<group>"; };
@@ -1476,7 +1478,7 @@
 				D6ADB6EF28ED1F25009924AB /* CachedImageView.swift */,
 				D6895DC328D65342006341DA /* ConfirmReblogStatusPreviewView.swift */,
 				D620483523D38075008A63EF /* ContentTextView.swift */,
-				D6D9498E298EB79400C59229 /* CopyableLabel.swift */,
+				D6D9498E298EB79400C59229 /* CopyableLable.swift */,
 				D6E426B225337C7000C02E1C /* CustomEmojiImageView.swift */,
 				D6969E9F240C8384002843CE /* EmojiLabel.swift */,
 				D61F75B8293C15A000C0B37F /* ZeroHeightCollectionViewCell.swift */,
@@ -1613,6 +1615,7 @@
 				D6DEBA8C2B6579830008629A /* MainThreadBox.swift */,
 				D6B81F432560390300F6E31D /* MenuController.swift */,
 				D6CF5B842AC7C56F00F15D83 /* MultiColumnCollectionViewLayout.swift */,
+				D64D8CA82463B494006B0BAA /* MultiThreadDictionary.swift */,
 				D6945C2E23AC47C3005C403C /* SavedDataManager.swift */,
 				D61F759E29385AD800C0B37F /* SemiCaseSensitiveComparator.swift */,
 				D6895DE828D962C2006341DA /* TimelineLikeController.swift */,
@@ -2287,7 +2290,7 @@
 				D61ABEFE28F1C92600B29151 /* FavoriteService.swift in Sources */,
 				D61F75AB293AF11400C0B37F /* FilterKeywordMO.swift in Sources */,
 				D65B4B5A29720AB000DABDFB /* ReportStatusView.swift in Sources */,
-				D6D9498F298EB79400C59229 /* CopyableLabel.swift in Sources */,
+				D6D9498F298EB79400C59229 /* CopyableLable.swift in Sources */,
 				D6333B792139AEFD00CE884A /* Date+TimeAgo.swift in Sources */,
 				D6D706A029466649000827ED /* ScrollingSegmentedControl.swift in Sources */,
 				D686BBE324FBF8110068E6AA /* WrappedProgressView.swift in Sources */,
@@ -2371,6 +2374,7 @@
 				D62E9987279D094F00C26176 /* StatusMetaIndicatorsView.swift in Sources */,
 				D6BEA247291A0F2D002F4D01 /* Duckable+Root.swift in Sources */,
 				D6C1B2082545D1EC00DAAA66 /* StatusCardView.swift in Sources */,
+				D64D8CA92463B494006B0BAA /* MultiThreadDictionary.swift in Sources */,
 				D630C3CA2BC59FF500208903 /* MastodonController+Push.swift in Sources */,
 				D6F6A554291F0D9600F496A8 /* DeleteListService.swift in Sources */,
 				D68E6F5F253C9B2D001A1B4C /* BaseEmojiLabel.swift in Sources */,
@@ -2527,7 +2531,6 @@
 				INFOPLIST_FILE = NotificationExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2560,7 +2563,6 @@
 				INFOPLIST_FILE = NotificationExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2592,7 +2594,6 @@
 				INFOPLIST_FILE = NotificationExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2683,7 +2684,6 @@
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = Tusker/Info.plist;
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.social-networking";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2727,7 +2727,7 @@
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = TuskerUITests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2750,7 +2750,6 @@
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2778,7 +2777,6 @@
 				INFOPLIST_FILE = ShareExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = ShareExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2023 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2807,7 +2805,6 @@
 				INFOPLIST_FILE = ShareExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = ShareExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2023 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2836,7 +2833,6 @@
 				INFOPLIST_FILE = ShareExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = ShareExtension;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2023 Shadowfacts. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -2992,7 +2988,6 @@
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = Tusker/Info.plist;
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.social-networking";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -3025,7 +3020,6 @@
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = Tusker/Info.plist;
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.social-networking";
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -3090,7 +3084,7 @@
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = TuskerUITests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -3110,7 +3104,7 @@
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = TuskerUITests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -3133,7 +3127,6 @@
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -3158,7 +3151,6 @@
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				INFOPLIST_FILE = OpenInTusker/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 16.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",

Tusker/Caching/DiskCache.swift

@@ -8,7 +8,6 @@
 
 import Foundation
 import CryptoKit
-import os
 
 struct DiskCacheTransformer<T> {
     let toData: (T) throws -> Data
@@ -22,7 +21,7 @@ class DiskCache<T> {
     let defaultExpiry: CacheExpiry
     let transformer: DiskCacheTransformer<T>
     
-    private var fileStates = OSAllocatedUnfairLock(initialState: [String: FileState]())
+    private var fileStates = MultiThreadDictionary<String, FileState>()
     
     init(name: String, defaultExpiry: CacheExpiry, transformer: DiskCacheTransformer<T>, fileManager: FileManager = .default) throws {
         self.defaultExpiry = defaultExpiry
@@ -60,9 +59,7 @@ class DiskCache<T> {
     }
     
     private func fileState(forKey key: String) -> FileState {
-        return fileStates.withLock {
-            $0[key] ?? .unknown
-        }
+        return fileStates[key] ?? .unknown
     }
     
     func setObject(_ object: T, forKey key: String) throws {
@@ -71,17 +68,13 @@ class DiskCache<T> {
         guard fileManager.createFile(atPath: path, contents: data, attributes: [.modificationDate: defaultExpiry.date]) else {
             throw Error.couldNotCreateFile
         }
-        fileStates.withLock {
-            $0[key] = .exists
-        }
+        fileStates[key] = .exists
     }
     
     func removeObject(forKey key: String) throws {
         let path = makeFilePath(for: key)
         try fileManager.removeItem(atPath: path)
-        fileStates.withLock {
-            $0[key] = .doesNotExist
-        }
+        fileStates[key] = .doesNotExist
     }
     
     func existsObject(forKey key: String) throws -> Bool {
@@ -112,9 +105,7 @@ class DiskCache<T> {
         }
         guard date.timeIntervalSinceNow >= 0 else {
             try fileManager.removeItem(atPath: path)
-            fileStates.withLock {
-                $0[key] = .doesNotExist
-            }
+            fileStates[key] = .doesNotExist
             throw Error.expired
         }
         

Tusker/CoreData/TimelinePosition.swift

@@ -76,10 +76,17 @@ func fromTimelineKind(_ kind: String) -> Timeline {
     } else if kind == "direct" {
         return .direct
     } else if kind.starts(with: "hashtag:") {
-        return .tag(hashtag: String(kind.trimmingPrefix("hashtag:")))
+        return .tag(hashtag: String(trimmingPrefix("hashtag:", of: kind)))
     } else if kind.starts(with: "list:") {
-        return .list(id: String(kind.trimmingPrefix("list:")))
+        return .list(id: String(trimmingPrefix("list:", of: kind)))
     } else {
         fatalError("invalid timeline kind \(kind)")
     }
 }
+
+// replace with Collection.trimmingPrefix
+@available(iOS, obsoleted: 16.0)
+@available(visionOS 1.0, *)
+private func trimmingPrefix(_ prefix: String, of str: String) -> Substring {
+    return str[str.index(str.startIndex, offsetBy: prefix.count)...]
+}

Tusker/Extensions/View+AppListStyle.swift

@@ -36,12 +36,19 @@ private struct AppGroupedListBackground: ViewModifier {
     }
     
     func body(content: Content) -> some View {
-        if colorScheme == .dark, !pureBlackDarkMode {
-            content
-                .scrollContentBackground(.hidden)
-                .background(Color.appGroupedBackground.edgesIgnoringSafeArea(.all))
+        if #available(iOS 16.0, *) {
+            if colorScheme == .dark, !pureBlackDarkMode {
+                content
+                    .scrollContentBackground(.hidden)
+                    .background(Color.appGroupedBackground.edgesIgnoringSafeArea(.all))
+            } else {
+                content
+            }
         } else {
             content
+                .onAppear {
+                    UITableView.appearance(whenContainedInInstancesOf: [container]).backgroundColor = .appGroupedBackground
+                }
         }
     }
 }
@@ -59,31 +66,3 @@ private struct AppGroupedListRowBackground: ViewModifier {
         }
     }
 }
-
-@propertyWrapper
-private struct PreferenceObserving<Key: TuskerPreferences.PreferenceKey>: DynamicProperty {
-    typealias PrefKeyPath = KeyPath<PreferenceStore, PreferencePublisher<Key>>
-    
-    let keyPath: PrefKeyPath
-    @StateObject private var observer: Observer
-    
-    init(_ keyPath: PrefKeyPath) {
-        self.keyPath = keyPath
-        self._observer = StateObject(wrappedValue: Observer(keyPath: keyPath))
-    }
-    
-    var wrappedValue: Key.Value {
-        Preferences.shared.getValue(preferenceKeyPath: keyPath)
-    }
-    
-    @MainActor
-    private class Observer: ObservableObject {
-        private var cancellable: AnyCancellable?
-        
-        init(keyPath: PrefKeyPath) {
-            cancellable = Preferences.shared[keyPath: keyPath].sink { [unowned self] _ in
-                self.objectWillChange.send()
-            }
-        }
-    }
-}

Tusker/HTMLConverter.swift

@@ -48,13 +48,14 @@ extension HTMLConverter {
             // Converting WebURL to URL is a small but non-trivial expense (since it works by
             // serializing the WebURL as a string and then having Foundation parse it again),
             // so, if available, use the system parser which doesn't require another round trip.
-            if let url = try? URL.ParseStrategy().parse(string) {
+            if #available(iOS 16.0, macOS 13.0, *),
+               let url = try? URL.ParseStrategy().parse(string) {
                 url
             } else if let web = WebURL(string),
                       let url = URL(web) {
                 url
             } else {
-                nil
+                URL(string: string)
             }
         }
         

Tusker/MultiThreadDictionary.swift

@@ -0,0 +1,104 @@
+//
+//  MultiThreadDictionary.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 5/6/20.
+//  Copyright © 2020 Shadowfacts. All rights reserved.
+//
+
+import Foundation
+import os
+
+// once we target iOS 16, replace uses of this with OSAllocatedUnfairLock<[Key: Value]>
+// to make the lock semantics more clear
+@available(iOS, obsoleted: 16.0)
+@available(visionOS 1.0, *)
+final class MultiThreadDictionary<Key: Hashable & Sendable, Value: Sendable>: @unchecked Sendable {
+    #if os(visionOS)
+    private let lock = OSAllocatedUnfairLock(initialState: [Key: Value]())
+    #else
+    private let lock: any Lock<[Key: Value]>
+    #endif
+    
+    init() {
+        #if !os(visionOS)
+        if #available(iOS 16.0, *) {
+            self.lock = OSAllocatedUnfairLock(initialState: [:])
+        } else {
+            self.lock = UnfairLock(initialState: [:])
+        }
+        #endif
+    }
+    
+    subscript(key: Key) -> Value? {
+        get {
+            return lock.withLock { dict in
+                dict[key]
+            }
+        }
+        set(value) {
+            #if os(visionOS)
+            lock.withLock { dict in
+                dict[key] = value
+            }
+            #else
+            _ = lock.withLock { dict in
+                dict[key] = value
+            }
+            #endif
+        }
+    }
+    
+    /// If the result of this function is unused, it is preferable to use `removeValueWithoutReturning` as it executes asynchronously and doesn't block the calling thread.
+    func removeValue(forKey key: Key) -> Value? {
+        return lock.withLock { dict in
+            dict.removeValue(forKey: key)
+        }
+    }
+    
+    func contains(key: Key) -> Bool {
+        return lock.withLock { dict in
+            dict.keys.contains(key)
+        }
+    }
+    
+    // TODO: this should really be throws/rethrows but the stupid type-erased lock makes that not possible
+    func withLock<R>(_ body: @Sendable (inout [Key: Value]) throws -> R) rethrows -> R where R: Sendable {
+        return try lock.withLock { dict in
+            return try body(&dict)
+        }
+    }
+}
+
+#if !os(visionOS)
+// TODO: replace this only with OSAllocatedUnfairLock
+@available(iOS, obsoleted: 16.0)
+fileprivate protocol Lock<State> {
+    associatedtype State
+    func withLock<R>(_ body: @Sendable (inout State) throws -> R) rethrows -> R where R: Sendable
+}
+
+@available(iOS 16.0, *)
+extension OSAllocatedUnfairLock: Lock {
+}
+
+// from http://www.russbishop.net/the-law
+fileprivate class UnfairLock<State>: Lock {
+    private var lock: UnsafeMutablePointer<os_unfair_lock>
+    private var state: State
+    init(initialState: State) {
+        self.state = initialState
+        self.lock = .allocate(capacity: 1)
+        self.lock.initialize(to: os_unfair_lock())
+    }
+    deinit {
+        self.lock.deinitialize(count: 1)
+        self.lock.deallocate()
+    }
+    func withLock<R>(_ body: (inout State) throws -> R) rethrows -> R where R: Sendable {
+        os_unfair_lock_lock(lock)
+        defer { os_unfair_lock_unlock(lock) }
+        return try body(&state)
+    }
+}
+#endif

Tusker/Scenes/MainSceneDelegate.swift

@@ -274,7 +274,8 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
         } else {
             mainVC = MainSplitViewController(mastodonController: mastodonController)
         }
-        if UIDevice.current.userInterfaceIdiom == .phone {
+        if UIDevice.current.userInterfaceIdiom == .phone,
+           #available(iOS 16.0, *) {
             // TODO: maybe the duckable container should be outside the account switching container
             return DuckableContainerViewController(child: mainVC)
         } else {

Tusker/Screens/Announcements/AddReactionView.swift

@@ -86,7 +86,7 @@ struct AddReactionView: View {
             }
         }
         .navigationViewStyle(.stack)
-        .presentationDetents([.medium, .large])
+        .mediumPresentationDetentIfAvailable()
         .alertWithData("Error Adding Reaction", data: $error, actions: { _ in
             Button("OK") {}
         }, message: { error in
@@ -171,6 +171,17 @@ private struct AddReactionButton<Label: View>: View {
 }
 
 private extension View {
+    @available(iOS, obsoleted: 16.0)
+    @available(visionOS 1.0, *)
+    @ViewBuilder
+    func mediumPresentationDetentIfAvailable() -> some View {
+        if #available(iOS 16.0, *) {
+            self.presentationDetents([.medium, .large])
+        } else {
+            self
+        }
+    }
+    
     @available(iOS, obsoleted: 17.1)
     @available(visionOS 1.0, *)
     @ViewBuilder

Tusker/Screens/Announcements/AnnouncementListRow.swift

@@ -20,10 +20,14 @@ struct AnnouncementListRow: View {
     @State private var isShowingAddReactionSheet = false
     
     var body: some View {
-        mostOfTheBody
-            .alignmentGuide(.listRowSeparatorLeading, computeValue: { dimension in
-                dimension[.leading]
-            })
+        if #available(iOS 16.0, *) {
+            mostOfTheBody
+                .alignmentGuide(.listRowSeparatorLeading, computeValue: { dimension in
+                    dimension[.leading]
+                })
+        } else {
+            mostOfTheBody
+        }
     }
     
     private var mostOfTheBody: some View {
@@ -50,7 +54,11 @@ struct AnnouncementListRow: View {
                         Label {
                             Text("Add Reaction")
                         } icon: {
-                            Image("face.smiling.badge.plus")
+                            if #available(iOS 16.0, *) {
+                                Image("face.smiling.badge.plus")
+                            } else {
+                                Image(systemName: "face.smiling")
+                            }
                         }
                     }
                     .labelStyle(.iconOnly)

Tusker/Screens/Compose/ComposeHostingController.swift

@@ -50,6 +50,10 @@ class ComposeHostingController: UIHostingController<ComposeHostingController.Vie
             emojiImageView: { AnyView(CustomEmojiImageView(emoji: $0)) }
         )
         
+        if let account = mastodonController.account {
+            controller.currentAccount = account
+        }
+        
         self.mastodonController = mastodonController
         
         super.init(rootView: View(mastodonController: mastodonController, controller: controller))
@@ -129,7 +133,6 @@ class ComposeHostingController: UIHostingController<ComposeHostingController.Vie
         let picker = PHPickerViewController(configuration: config)
         picker.delegate = self
         picker.modalPresentationStyle = .pageSheet
-        picker.overrideUserInterfaceStyle = .dark
         // sheet detents don't play nice with PHPickerViewController, see
 //        let sheet = picker.sheetPresentationController!
 //        sheet.detents = [.medium(), .large()]
@@ -151,7 +154,8 @@ class ComposeHostingController: UIHostingController<ComposeHostingController.Vie
         var body: some SwiftUI.View {
             ControllerView(controller: { controller })
                 .task {
-                    if let account = try? await mastodonController.getOwnAccount() {
+                    if controller.currentAccount == nil,
+                       let account = try? await mastodonController.getOwnAccount() {
                         controller.currentAccount = account
                     }
                 }
@@ -185,6 +189,7 @@ extension ComposeHostingController: DuckableViewController {
 }
 #endif
 
+// TODO: don't conform MastodonController to this protocol, use a separate type
 extension MastodonController: ComposeMastodonContext {
     @MainActor
     func searchCachedAccounts(query: String) -> [AccountProtocol] {
@@ -227,6 +232,10 @@ extension MastodonController: ComposeMastodonContext {
     func storeCreatedStatus(_ status: Status) {
         persistentContainer.addOrUpdate(status: status)
     }
+    
+    func fetchStatus(id: String) -> (any StatusProtocol)? {
+        return persistentContainer.status(for: id)
+    }
 }
 
 extension ComposeHostingController: PHPickerViewControllerDelegate {

Tusker/Screens/Customize Timelines/AddHashtagPinnedTimelineView.swift

@@ -9,6 +9,20 @@
 import SwiftUI
 import Pachyderm
 
+@available(iOS, obsoleted: 16.0)
+struct AddHashtagPinnedTimelineRepresentable: UIViewControllerRepresentable {
+    typealias UIViewControllerType = UIHostingController<AddHashtagPinnedTimelineView>
+    
+    @Binding var pinnedTimelines: [PinnedTimeline]
+    
+    func makeUIViewController(context: Context) -> UIHostingController<AddHashtagPinnedTimelineView> {
+        return UIHostingController(rootView: AddHashtagPinnedTimelineView(pinnedTimelines: $pinnedTimelines))
+    }
+    
+    func updateUIViewController(_ uiViewController: UIHostingController<AddHashtagPinnedTimelineView>, context: Context) {
+    }
+}
+
 struct AddHashtagPinnedTimelineView: View {
     @EnvironmentObject private var mastodonController: MastodonController
     @Environment(\.dismiss) private var dismiss
@@ -35,6 +49,9 @@ struct AddHashtagPinnedTimelineView: View {
     var body: some View {
         NavigationView {
             list
+                #if !os(visionOS)
+                .appGroupedListBackground(container: AddHashtagPinnedTimelineRepresentable.UIViewControllerType.self)
+                #endif
                 .listStyle(.grouped)
                 .navigationTitle("Add Hashtag")
                 .navigationBarTitleDisplayMode(.inline)

Tusker/Screens/Customize Timelines/CustomizeTimelinesView.swift

@@ -36,8 +36,15 @@ struct CustomizeTimelinesList: View {
     }
 
     var body: some View {
-        NavigationStack {
-            navigationBody
+        if #available(iOS 16.0, *) {
+            NavigationStack {
+                navigationBody
+            }
+        } else {
+            NavigationView {
+                navigationBody
+            }
+            .navigationViewStyle(.stack)
         }
     }
     

Tusker/Screens/Customize Timelines/EditFilterView.swift

@@ -149,7 +149,7 @@ struct EditFilterView: View {
         }
         .appGroupedListBackground(container: UIHostingController<CustomizeTimelinesList>.self)
         #if !os(visionOS)
-        .scrollDismissesKeyboard(.interactively)
+        .scrollDismissesKeyboardInteractivelyIfAvailable()
         #endif
         .navigationTitle(create ? "Add Filter" : "Edit Filter")
         .navigationBarTitleDisplayMode(.inline)
@@ -226,6 +226,18 @@ private struct FilterContextToggleStyle: ToggleStyle {
     }
 }
 
+private extension View {
+    @available(iOS, obsoleted: 16.0)
+    @ViewBuilder
+    func scrollDismissesKeyboardInteractivelyIfAvailable() -> some View {
+        if #available(iOS 16.0, *) {
+            self.scrollDismissesKeyboard(.interactively)
+        } else {
+            self
+        }
+    }
+}
+
 //struct EditFilterView_Previews: PreviewProvider {
 //    static var previews: some View {
 //        EditFilterView()

Tusker/Screens/Customize Timelines/PinnedTimelinesView.swift

@@ -115,8 +115,18 @@ struct PinnedTimelinesModifier: ViewModifier {
     func body(content: Content) -> some View {
         content
             .sheet(isPresented: $isShowingAddHashtagSheet, content: {
+                #if os(visionOS)
                 AddHashtagPinnedTimelineView(pinnedTimelines: $pinnedTimelines)
                     .edgesIgnoringSafeArea(.bottom)
+                #else
+                if #available(iOS 16.0, *) {
+                    AddHashtagPinnedTimelineView(pinnedTimelines: $pinnedTimelines)
+                        .edgesIgnoringSafeArea(.bottom)
+                } else {
+                    AddHashtagPinnedTimelineRepresentable(pinnedTimelines: $pinnedTimelines)
+                        .edgesIgnoringSafeArea(.bottom)
+                }
+                #endif
             })
             .sheet(isPresented: $isShowingAddInstanceSheet, content: {
                 AddInstancePinnedTimelineView(pinnedTimelines: $pinnedTimelines)

Tusker/Screens/Explore/InlineTrendsViewController.swift

@@ -41,7 +41,9 @@ class InlineTrendsViewController: UIViewController {
 
         navigationItem.searchController = searchController
         navigationItem.hidesSearchBarWhenScrolling = false
-        navigationItem.preferredSearchBarPlacement = .stacked
+        if #available(iOS 16.0, *) {
+            navigationItem.preferredSearchBarPlacement = .stacked
+        }
         
         let trends = TrendsViewController(mastodonController: mastodonController)
         trends.view.translatesAutoresizingMaskIntoConstraints = false

Tusker/Screens/Explore/TrendsViewController.swift

@@ -525,12 +525,12 @@ extension TrendsViewController: UICollectionViewDelegate {
         }
     }
     
-    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemsAt indexPaths: [IndexPath], point: CGPoint) -> UIContextMenuConfiguration? {
-        guard indexPaths.count == 1,
-              let item = dataSource.itemIdentifier(for: indexPaths[0])  else {
+    @available(iOS, obsoleted: 16.0)
+    @available(visionOS 1.0, *)
+    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+        guard let item = dataSource.itemIdentifier(for: indexPath) else {
             return nil
         }
-        let indexPath = indexPaths[0]
         
         switch item {
         case .loadingIndicator, .confirmLoadMoreStatuses(_):
@@ -584,6 +584,15 @@ extension TrendsViewController: UICollectionViewDelegate {
         }
     }
     
+    // implementing the highlightPreviewForItemAt method seems to prevent the old, single IndexPath variant of this method from being called on iOS 16
+    @available(iOS 16.0, visionOS 1.0, *)
+    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemsAt indexPaths: [IndexPath], point: CGPoint) -> UIContextMenuConfiguration? {
+        guard indexPaths.count == 1 else {
+            return nil
+        }
+        return self.collectionView(collectionView, contextMenuConfigurationForItemAt: indexPaths[0], point: point)
+    }
+    
     func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
         MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
     }

Tusker/Screens/Lists/EditListAccountsViewController.swift

@@ -100,13 +100,28 @@ class EditListAccountsViewController: UIViewController, CollectionViewController
         
         navigationItem.searchController = searchController
         navigationItem.hidesSearchBarWhenScrolling = false
-        navigationItem.preferredSearchBarPlacement = .stacked
-        
-        navigationItem.renameDelegate = self
-        navigationItem.titleMenuProvider = { [unowned self] suggested in
-            var children = suggested
-            children.append(contentsOf: self.listSettingsMenuElements())
-            return UIMenu(children: children)
+        if #available(iOS 16.0, *) {
+            navigationItem.preferredSearchBarPlacement = .stacked
+            
+            navigationItem.renameDelegate = self
+            navigationItem.titleMenuProvider = { [unowned self] suggested in
+                var children = suggested
+                children.append(contentsOf: self.listSettingsMenuElements())
+                return UIMenu(children: children)
+            }
+        } else {
+            navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Edit", menu: UIMenu(children: [
+                // uncached so that menu always reflects the current state of the list
+                UIDeferredMenuElement.uncached({ [unowned self] elementHandler in
+                    var elements = self.listSettingsMenuElements()
+                    elements.insert(UIAction(title: "Rename…", image: UIImage(systemName: "pencil"), handler: { [unowned self] _ in
+                        RenameListService(list: self.list, mastodonController: self.mastodonController, present: {
+                            self.present($0, animated: true)
+                        }).run()
+                    }), at: 0)
+                    elementHandler(elements)
+                })
+            ]))
         }
     }
     

Tusker/Screens/Mute/MuteAccountView.swift

@@ -41,8 +41,15 @@ struct MuteAccountView: View {
     @State private var error: Error?
     
     var body: some View {
-        NavigationStack {
-            navigationViewContent
+        if #available(iOS 16.0, *) {
+            NavigationStack {
+                navigationViewContent
+            }
+        } else {
+            NavigationView {
+                navigationViewContent
+            }
+            .navigationViewStyle(.stack)
         }
     }
     

Tusker/Screens/Notifications/FollowRequestNotificationViewController.swift

@@ -101,8 +101,14 @@ extension FollowRequestNotificationViewController: UICollectionViewDelegate {
                 UIAction(title: "Accept", image: UIImage(systemName: "checkmark.circle"), handler: { _ in cell.acceptButtonPressed() }),
                 UIAction(title: "Reject", image: UIImage(systemName: "xmark.circle"), handler: { _ in cell.rejectButtonPressed() }),
             ]
+            let acceptRejectMenu: UIMenu
+            if #available(iOS 16.0, *) {
+                acceptRejectMenu = UIMenu(options: .displayInline, preferredElementSize: .medium, children: acceptRejectChildren)
+            } else {
+                acceptRejectMenu = UIMenu(options: .displayInline, children: acceptRejectChildren)
+            }
             return UIMenu(children: [
-                UIMenu(options: .displayInline, preferredElementSize: .medium, children: acceptRejectChildren),
+                acceptRejectMenu,
                 UIMenu(options: .displayInline, children: self.actionsForProfile(accountID: accountID, source: .view(cell))),
             ])
         }

Tusker/Screens/Notifications/NotificationsCollectionViewController.swift

@@ -700,8 +700,14 @@ extension NotificationsCollectionViewController: UICollectionViewDelegate {
                     UIAction(title: "Accept", image: UIImage(systemName: "checkmark.circle"), handler: { _ in cell.acceptButtonPressed() }),
                     UIAction(title: "Reject", image: UIImage(systemName: "xmark.circle"), handler: { _ in cell.rejectButtonPressed() }),
                 ]
+                let acceptRejectMenu: UIMenu
+                if #available(iOS 16.0, *) {
+                    acceptRejectMenu = UIMenu(options: .displayInline, preferredElementSize: .medium, children: acceptRejectChildren)
+                } else {
+                    acceptRejectMenu = UIMenu(options: .displayInline, children: acceptRejectChildren)
+                }
                 return UIMenu(children: [
-                    UIMenu(options: .displayInline, preferredElementSize: .medium, children: acceptRejectChildren),
+                    acceptRejectMenu,
                     UIMenu(options: .displayInline, children: self.actionsForProfile(accountID: accountID, source: .view(cell))),
                 ])
             }

Tusker/Screens/Onboarding/InstanceSelectorTableViewController.swift

@@ -96,7 +96,9 @@ class InstanceSelectorTableViewController: UITableViewController {
         searchController.searchBar.placeholder = "Search or enter a URL"
         navigationItem.searchController = searchController
         navigationItem.hidesSearchBarWhenScrolling = false
-        navigationItem.preferredSearchBarPlacement = .stacked
+        if #available(iOS 16.0, *) {
+            navigationItem.preferredSearchBarPlacement = .stacked
+        }
         definesPresentationContext = true
         
         urlHandler = urlCheckerSubject

Tusker/Screens/Preferences/About/AboutView.swift

@@ -91,10 +91,14 @@ struct AboutView: View {
     
     @ViewBuilder
     private var iconOrGame: some View {
-        FlipView {
+        if #available(iOS 16.0, *) {
+            FlipView {
+                appIcon
+            } back: {
+                TTTView()
+            }
+        } else {
             appIcon
-        } back: {
-            TTTView()
         }
     }
     

Tusker/Screens/Preferences/AdvancedPrefsView.swift

@@ -18,7 +18,6 @@ struct AdvancedPrefsView : View {
     @State private var mastodonCacheSize: Int64 = 0
     @State private var cloudKitStatus: CKAccountStatus?
     @State private var isShowingFeatureFlagAlert = false
-    @State private var featureFlagName = ""
     
     var body: some View {
         List {
@@ -32,23 +31,9 @@ struct AdvancedPrefsView : View {
         .listStyle(.insetGrouped)
         .appGroupedListBackground(container: PreferencesNavigationController.self)
         .onTapGesture(count: 3) {
-            featureFlagName = ""
             isShowingFeatureFlagAlert = true
         }
-        .alert("Enable Feature Flag", isPresented: $isShowingFeatureFlagAlert) {
-            TextField("Flag Name", text: $featureFlagName)
-                .textInputAutocapitalization(.never)
-                .autocorrectionDisabled()
-            
-            Button("Cancel", role: .cancel) {}
-            Button("Enable") {
-                if let flag = FeatureFlag(rawValue: featureFlagName) {
-                    preferences.enabledFeatureFlags.insert(flag)
-                }
-            }
-        } message: {
-            Text("Warning: Feature flags are intended for development and debugging use only. They are experimental and subject to change at any time.")
-        }
+        .modifier(FeatureFlagAlertModifier(showing: $isShowingFeatureFlagAlert))
         .navigationBarTitle(Text("Advanced"))
     }
     
@@ -252,6 +237,74 @@ extension StatusContentType {
     }
 }
 
+private struct FeatureFlagAlertModifier: ViewModifier {
+    @Binding var showing: Bool
+    @ObservedObject private var preferences = Preferences.shared
+    @State private var featureFlagName = ""
+    
+    func body(content: Content) -> some View {
+        if #available(iOS 16.0, *) {
+            content
+                .onChange(of: showing) {
+                    if $0 {
+                        featureFlagName = ""
+                    }
+                }
+                .alert("Enable Feature Flag", isPresented: $showing) {
+                    textField
+                    Button("Cancel", role: .cancel) {}
+                    Button("Enable", action: enableFlag)
+                } message: {
+                    warning
+                }
+        } else {
+            content
+                .sheet(isPresented: $showing) {
+                    NavigationView {
+                        List {
+                            Section {
+                                textField
+                            } footer: {
+                                warning
+                            }
+                        }
+                        .navigationTitle("Enable Feature Flag")
+                        .navigationBarTitleDisplayMode(.inline)
+                        .listStyle(.insetGrouped)
+                        .toolbar {
+                            ToolbarItem(placement: .cancellationAction) {
+                                Button("Cancel") {
+                                    showing = false
+                                }
+                            }
+                            ToolbarItem(placement: .confirmationAction) {
+                                Button("Enable", action: self.enableFlag)
+                            }
+                        }
+                    }
+                    .navigationViewStyle(.stack)
+                }
+        }
+    }
+    
+    private var textField: some View {
+        TextField("Flag Name", text: $featureFlagName)
+            .textInputAutocapitalization(.never)
+            .autocorrectionDisabled()
+    }
+    
+    private var warning: Text {
+        Text("Warning: Feature flags are intended for development and debugging use only. They are experimental and subject to change at any time.")
+    }
+    
+    private func enableFlag() {
+        if let flag = FeatureFlag(rawValue: featureFlagName) {
+            preferences.enabledFeatureFlags.insert(flag)
+            showing = false
+        }
+    }
+}
+
 #if DEBUG
 struct AdvancedPrefsView_Previews : PreviewProvider {
     static var previews: some View {

Tusker/Screens/Preferences/Appearance/AppearancePrefsView.swift

@@ -27,7 +27,14 @@ struct AppearancePrefsView: View {
     private static let accentColorsAndImages: [(AccentColor, UIImage?)] = AccentColor.allCases.map { color in
         var image: UIImage?
         if let color = color.color {
-            image = UIImage(systemName: "circle.fill")!.withTintColor(color, renderingMode: .alwaysTemplate).withRenderingMode(.alwaysOriginal)
+            if #available(iOS 16.0, *) {
+                image = UIImage(systemName: "circle.fill")!.withTintColor(color, renderingMode: .alwaysTemplate).withRenderingMode(.alwaysOriginal)
+            } else {
+                image = UIGraphicsImageRenderer(size: CGSize(width: 20, height: 20)).image { context in
+                    color.setFill()
+                    context.cgContext.fillEllipse(in: CGRect(x: 0, y: 0, width: 20, height: 20))
+                }
+            }
         }
         return (color, image)
     }

Tusker/Screens/Preferences/Notifications/NotificationsPrefsView.swift

@@ -36,7 +36,12 @@ struct NotificationsPrefsView: View {
             if #available(iOS 15.4, *) {
                 Section {
                     Button {
-                        if let url = URL(string: UIApplication.openNotificationSettingsURLString) {
+                        let str = if #available(iOS 16.0, *) {
+                            UIApplication.openNotificationSettingsURLString
+                        } else {
+                            UIApplicationOpenNotificationSettingsURLString
+                        }
+                        if let url = URL(string: str) {
                             UIApplication.shared.open(url)
                         }
                     } label: {

Tusker/Screens/Preferences/Notifications/PushInstanceSettingsView.swift

@@ -34,7 +34,7 @@ struct PushInstanceSettingsView: View {
             HStack {
                 PrefsAccountView(account: account)
                 Spacer()
-                AsyncToggle("\(account.instanceURL.host!) notifications enabled", mode: $mode, onChange: updateNotificationsEnabled(enabled:))
+                AsyncToggle("\(account.instanceURL.host!) notifications enabled", labelHidden: true, mode: $mode, onChange: updateNotificationsEnabled(enabled:))
                     .labelsHidden()
             }
             PushSubscriptionView(account: account, mastodonController: mastodonController, subscription: subscription, updateSubscription: updateSubscription)

Tusker/Screens/Preferences/OppositeCollapseKeywordsView.swift

@@ -43,9 +43,21 @@ struct OppositeCollapseKeywordsView: View {
             .listStyle(.grouped)
             .appGroupedListBackground(container: PreferencesNavigationController.self)
         }
+        #if !os(visionOS)
+        .onAppear(perform: updateAppearance)
+        #endif
         .navigationBarTitle(preferences.expandAllContentWarnings ? "Collapse Post CW Keywords" : "Expand Post CW Keywords")
     }
     
+    @available(iOS, obsoleted: 16.0)
+    private func updateAppearance() {
+        if #available(iOS 16.0, *) {
+            // no longer necessary
+        } else {
+            UIScrollView.appearance(whenContainedInInstancesOf: [PreferencesNavigationController.self]).keyboardDismissMode = .interactive
+        }
+    }
+    
     private func commitExisting(at index: Int) -> () -> Void {
         return {
             if keywords[index].value.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {

Tusker/Screens/Report/ReportAddStatusView.swift

@@ -69,30 +69,34 @@ private struct ScrollBackgroundModifier: ViewModifier {
     @Environment(\.colorScheme) private var colorScheme
     
     func body(content: Content) -> some View {
-        content
-            .scrollContentBackground(.hidden)
-            .background {
-                // otherwise the pureBlackDarkMode isn't propagated, for some reason?
-                // even though it is for ReportSelectRulesView??
-                let traits: UITraitCollection = {
-                    var t = UITraitCollection(userInterfaceStyle: colorScheme == .dark ? .dark : .light)
-                    #if os(visionOS)
-                    t = t.modifyingTraits({ mutableTraits in
-                        mutableTraits.pureBlackDarkMode = true
-                    })
-                    #else
-                    if #available(iOS 17.0, *) {
+        if #available(iOS 16.0, *) {
+            content
+                .scrollContentBackground(.hidden)
+                .background {
+                    // otherwise the pureBlackDarkMode isn't propagated, for some reason?
+                    // even though it is for ReportSelectRulesView??
+                    let traits: UITraitCollection = {
+                        var t = UITraitCollection(userInterfaceStyle: colorScheme == .dark ? .dark : .light)
+                        #if os(visionOS)
                         t = t.modifyingTraits({ mutableTraits in
                             mutableTraits.pureBlackDarkMode = true
                         })
-                    } else {
-                        t.obsoletePureBlackDarkMode = true
-                    }
-                    #endif
-                    return t
-                }()
-                Color(uiColor: .appGroupedBackground.resolvedColor(with: traits))
-                    .edgesIgnoringSafeArea(.all)
-            }
+                        #else
+                        if #available(iOS 17.0, *) {
+                            t = t.modifyingTraits({ mutableTraits in
+                                mutableTraits.pureBlackDarkMode = true
+                            })
+                        } else {
+                            t.obsoletePureBlackDarkMode = true
+                        }
+                        #endif
+                        return t
+                    }()
+                    Color(uiColor: .appGroupedBackground.resolvedColor(with: traits))
+                        .edgesIgnoringSafeArea(.all)
+                }
+        } else {
+            content
+        }
     }
 }

Tusker/Screens/Report/ReportSelectRulesView.swift

@@ -49,12 +49,26 @@ struct ReportSelectRulesView: View {
             }
             .appGroupedListRowBackground()
         }
-        .scrollContentBackground(.hidden)
-        .background(Color.appGroupedBackground)
+        .withAppBackgroundIfAvailable()
         .navigationTitle("Rules")
     }
 }
 
+private extension View {
+    @available(iOS, obsoleted: 16.0)
+    @available(visionOS 1.0, *)
+    @ViewBuilder
+    func withAppBackgroundIfAvailable() -> some View {
+        if #available(iOS 16.0, *) {
+            self
+                .scrollContentBackground(.hidden)
+                .background(Color.appGroupedBackground)
+        } else {
+            self
+        }
+    }
+}
+
 //struct ReportSelectRulesView_Previews: PreviewProvider {
 //    static var previews: some View {
 //        ReportSelectRulesView()

Tusker/Screens/Report/ReportView.swift

@@ -27,11 +27,18 @@ struct ReportView: View {
     }
     
     var body: some View {
-        NavigationStack {
-            navigationViewContent
-                #if !os(visionOS)
-                .scrollDismissesKeyboard(.interactively)
-                #endif
+        if #available(iOS 16.0, *) {
+            NavigationStack {
+                navigationViewContent
+                    #if !os(visionOS)
+                    .scrollDismissesKeyboard(.interactively)
+                    #endif
+            }
+        } else {
+            NavigationView {
+                navigationViewContent
+            }
+            .navigationViewStyle(.stack)
         }
     }
     

Tusker/Screens/Search/MastodonSearchController.swift

@@ -39,7 +39,9 @@ class MastodonSearchController: UISearchController {
         searchResultsUpdater = searchResultsController
         automaticallyShowsSearchResultsController = false
         showsSearchResultsController = true
-        scopeBarActivation = .onSearchActivation
+        if #available(iOS 16.0, *) {
+            scopeBarActivation = .onSearchActivation
+        }
         
         searchBar.autocapitalizationType = .none
         searchBar.delegate = self
@@ -76,8 +78,12 @@ class MastodonSearchController: UISearchController {
         if searchText != defaultLanguage,
            let match = languageRegex.firstMatch(in: searchText, range: NSRange(location: 0, length: searchText.utf16.count)) {
             let identifier = (searchText as NSString).substring(with: match.range(at: 1))
-            if Locale.LanguageCode.isoLanguageCodes.contains(where: { $0.identifier == identifier }) {
-                langSuggestions.append("language:\(identifier)")
+            if #available(iOS 16.0, *) {
+                if Locale.LanguageCode.isoLanguageCodes.contains(where: { $0.identifier == identifier }) {
+                    langSuggestions.append("language:\(identifier)")
+                }
+            } else if searchText != "en" {
+                langSuggestions.append("language:\(searchText)")
             }
         }
         suggestions.append((.language, langSuggestions))

Tusker/Screens/Utilities/EnhancedNavigationViewController.swift

@@ -22,7 +22,8 @@ class EnhancedNavigationViewController: UINavigationController {
     override var viewControllers: [UIViewController] {
         didSet {
             poppedViewControllers = []
-            if useBrowserStyleNavigation {
+            if #available(iOS 16.0, *),
+               useBrowserStyleNavigation {
                 // TODO: this for loop might not be necessary
                 for vc in viewControllers {
                     configureNavItem(vc.navigationItem)
@@ -39,7 +40,8 @@ class EnhancedNavigationViewController: UINavigationController {
         self.interactivePushTransition = InteractivePushTransition(navigationController: self)
         #endif
         
-        if useBrowserStyleNavigation,
+        if #available(iOS 16.0, *),
+           useBrowserStyleNavigation,
            let topViewController {
             configureNavItem(topViewController.navigationItem)
             updateTopNavItemState()
@@ -50,7 +52,9 @@ class EnhancedNavigationViewController: UINavigationController {
         let popped = performAfterAnimating(block: {
             super.popViewController(animated: animated)
         }, after: {
-            self.updateTopNavItemState()
+            if #available(iOS 16.0, *) {
+                self.updateTopNavItemState()
+            }
         }, animated: animated)
         if let popped {
             poppedViewControllers.insert(popped, at: 0)
@@ -62,7 +66,9 @@ class EnhancedNavigationViewController: UINavigationController {
         let popped = performAfterAnimating(block: {
             super.popToRootViewController(animated: animated)
         }, after: {
-            self.updateTopNavItemState()
+            if #available(iOS 16.0, *) {
+                self.updateTopNavItemState()
+            }
         }, animated: animated)
         if let popped {
             poppedViewControllers = popped
@@ -74,7 +80,9 @@ class EnhancedNavigationViewController: UINavigationController {
         let popped = performAfterAnimating(block: {
             super.popToViewController(viewController, animated: animated)
         }, after: {
-            self.updateTopNavItemState()
+            if #available(iOS 16.0, *) {
+                self.updateTopNavItemState()
+            }
         }, animated: animated)
         if let popped {
             poppedViewControllers.insert(contentsOf: popped, at: 0)
@@ -89,11 +97,15 @@ class EnhancedNavigationViewController: UINavigationController {
             self.poppedViewControllers = []
         }
         
-        configureNavItem(viewController.navigationItem)
+        if #available(iOS 16.0, *) {
+            configureNavItem(viewController.navigationItem)
+        }
         
         super.pushViewController(viewController, animated: animated)
         
-        updateTopNavItemState()
+        if #available(iOS 16.0, *) {
+            updateTopNavItemState()
+        }
     }
     
     func pushPoppedViewController() {
@@ -123,7 +135,9 @@ class EnhancedNavigationViewController: UINavigationController {
             pushViewController(target, animated: true)
         }, after: {
             self.viewControllers.insert(contentsOf: toInsert, at: self.viewControllers.count - 1)
-            self.updateTopNavItemState()
+            if #available(iOS 16.0, *) {
+                self.updateTopNavItemState()
+            }
         }, animated: true)
     }
     

Tusker/Screens/Utilities/Previewing.swift

@@ -204,7 +204,8 @@ extension MenuActionProvider {
             }),
         ]
         
-        if includeStatusButtonActions {
+        if #available(iOS 16.0, *),
+           includeStatusButtonActions {
             let favorited = status.favourited
             // TODO: move this color into an asset catalog or something
             var favImage = UIImage(systemName: favorited ? "star.fill" : "star")!
@@ -367,11 +368,19 @@ extension MenuActionProvider {
         
         addOpenInNewWindow(actions: &shareSection, activity: UserActivityManager.showConversationActivity(mainStatusID: status.id, accountID: accountID))
         
-        let toggleableAndActions = toggleableSection + actionsSection
-        return [
-            UIMenu(options: .displayInline, preferredElementSize: toggleableAndActions.count == 1 ? .large : .medium, children: toggleableAndActions),
-            UIMenu(options: .displayInline, children: shareSection),
-        ]
+        if #available(iOS 16.0, *) {
+            let toggleableAndActions = toggleableSection + actionsSection
+            return [
+                UIMenu(options: .displayInline, preferredElementSize: toggleableAndActions.count == 1 ? .large : .medium, children: toggleableAndActions),
+                UIMenu(options: .displayInline, children: shareSection),
+            ]
+        } else {
+            return [
+                UIMenu(options: .displayInline, children: shareSection),
+                UIMenu(options: .displayInline, children: toggleableSection),
+                UIMenu(options: .displayInline, children: actionsSection),
+            ]
+        }
     }
     
     func actionsForTrendingLink(card: Card, source: PopoverSource) -> [UIMenuElement] {

Tusker/Shortcuts/UserActivityHandlingContext.swift

@@ -108,7 +108,8 @@ class StateRestorationUserActivityHandlingContext: UserActivityHandlingContext {
     }
     
     func compose(editing draft: Draft) {
-        if UIDevice.current.userInterfaceIdiom == .phone {
+        if #available(iOS 16.0, *),
+           UIDevice.current.userInterfaceIdiom == .phone {
             self.root.compose(editing: draft, animated: false, isDucked: true, completion: nil)
         } else {
             DispatchQueue.main.async {
@@ -122,7 +123,8 @@ class StateRestorationUserActivityHandlingContext: UserActivityHandlingContext {
         precondition(state > .initial)
         navigation.run()
         #if !os(visionOS)
-        if let duckedDraft = UserActivityManager.getDuckedDraft(from: activity) {
+        if #available(iOS 16.0, *),
+           let duckedDraft = UserActivityManager.getDuckedDraft(from: activity) {
             self.root.compose(editing: duckedDraft, animated: false, isDucked: true, completion: nil)
         }
         #endif

Tusker/TuskerNavigationDelegate.swift

@@ -114,7 +114,8 @@ extension TuskerNavigationDelegate {
             #if os(visionOS)
             fatalError("unreachable")
             #else
-            if presentDuckable(compose, animated: animated, isDucked: isDucked, completion: completion) {
+            if #available(iOS 16.0, *),
+               presentDuckable(compose, animated: animated, isDucked: isDucked, completion: completion) {
                 return
             } else {
                 present(compose, animated: animated, completion: completion)

Tusker/Views/AccountDisplayNameView.swift

@@ -9,7 +9,6 @@
 import SwiftUI
 import Pachyderm
 import WebURLFoundationExtras
-import os
 
 private let emojiRegex = try! NSRegularExpression(pattern: ":(\\w+):", options: [])
 
@@ -41,7 +40,7 @@ struct AccountDisplayNameView: View {
         guard !matches.isEmpty else { return }
         
         let emojiSize = self.emojiSize
-        let emojiImages = OSAllocatedUnfairLock(initialState: [String: Image]())
+        let emojiImages = MultiThreadDictionary<String, Image>()
         
         let group = DispatchGroup()
         
@@ -64,9 +63,7 @@ struct AccountDisplayNameView: View {
                     image.draw(in: CGRect(origin: .zero, size: size))
                 }
                 
-                emojiImages.withLock {
-                    $0[emoji.shortcode] = Image(uiImage: resized)
-                }
+                emojiImages[emoji.shortcode] = Image(uiImage: resized)
             }
             if let request = request {
                 emojiRequests.append(request)
@@ -81,7 +78,7 @@ struct AccountDisplayNameView: View {
             // iterate backwards as to not alter the indices of earlier matches
             for match in matches.reversed() {
                 let shortcode = (account.displayName as NSString).substring(with: match.range(at: 1))
-                guard let image = emojiImages.withLock({ $0[shortcode] }) else { continue }
+                guard let image = emojiImages[shortcode] else { continue }
                 
                 let afterCurrentMatch = (account.displayName as NSString).substring(with: NSRange(location: match.range.upperBound, length: endIndex - match.range.upperBound))
                 

Tusker/Views/Attachments/AttachmentView.swift

@@ -263,7 +263,17 @@ class AttachmentView: GIFImageView {
             let asset = AVURLAsset(url: attachment.url)
             let generator = AVAssetImageGenerator(asset: asset)
             generator.appliesPreferredTrackTransform = true
-            guard let image = try? await generator.image(at: .zero).image,
+            let image: CGImage?
+            #if os(visionOS)
+            image = try? await generator.image(at: .zero).image
+            #else
+            if #available(iOS 16.0, *) {
+                image = try? await generator.image(at: .zero).image
+            } else {
+                image = try? generator.copyCGImage(at: .zero, actualTime: nil)
+            }
+            #endif
+            guard let image,
                   let prepared = await UIImage(cgImage: image).byPreparingForDisplay(),
                   !Task.isCancelled else {
                 return

Tusker/Views/BaseEmojiLabel.swift

@@ -9,7 +9,6 @@
 import UIKit
 import Pachyderm
 import WebURLFoundationExtras
-import os
 
 private let emojiRegex = try! NSRegularExpression(pattern: ":(\\w+):", options: [])
 
@@ -57,7 +56,7 @@ extension BaseEmojiLabel {
             return imageSizeMatchingFontSize
         }
         
-        let emojiImages = OSAllocatedUnfairLock(initialState: [String: UIImage]())
+        let emojiImages = MultiThreadDictionary<String, UIImage>()
         var foundEmojis = false
         
         let group = DispatchGroup()
@@ -80,11 +79,9 @@ extension BaseEmojiLabel {
                 // todo: consider caching these somewhere? the cache needs to take into account both the url and the font size, which may vary across labels, so can't just use ImageCache
                 if let thumbnail = image.preparingThumbnail(of: emojiImageSize(image)),
                    let cgImage = thumbnail.cgImage {
-                    emojiImages.withLock {
-                        // the thumbnail API takes a pixel size and returns an image with scale 1, but we want the actual screen scale, so convert
-                        // see FB12187798
-                        $0[emoji.shortcode] = UIImage(cgImage: cgImage, scale: screenScale, orientation: .up)
-                    }
+                    // the thumbnail API takes a pixel size and returns an image with scale 1, but we want the actual screen scale, so convert
+                    // see FB12187798
+                    emojiImages[emoji.shortcode] = UIImage(cgImage: cgImage, scale: screenScale, orientation: .up)
                 }
             } else {
                 // otherwise, perform the network request
@@ -102,9 +99,7 @@ extension BaseEmojiLabel {
                             group.leave()
                             return
                         }
-                        emojiImages.withLock {
-                            $0[emoji.shortcode] = transformedImage
-                        }
+                        emojiImages[emoji.shortcode] = transformedImage
                         group.leave()
                     }
                 }

Tusker/Views/ContentTextView.swift

@@ -146,7 +146,8 @@ class ContentTextView: LinkTextView, BaseEmojiLabel {
 
     func getLinkAtPoint(_ point: CGPoint) -> (URL, NSRange)? {
         let locationInTextContainer = CGPoint(x: point.x - textContainerInset.left, y: point.y - textContainerInset.top)
-        if let textLayoutManager {
+        if #available(iOS 16.0, *),
+           let textLayoutManager {
             guard let fragment = textLayoutManager.textLayoutFragment(for: locationInTextContainer) else {
                 return nil
             }
@@ -304,7 +305,8 @@ extension ContentTextView: UIContextMenuInteractionDelegate {
         
         // Determine the line rects that the link takes up in the coordinate space of this view.
         var rects = [CGRect]()
-        if let textLayoutManager,
+        if #available(iOS 16.0, *),
+           let textLayoutManager,
            let contentManager = textLayoutManager.textContentManager {
             // convert from NSRange to NSTextRange
             // i have no idea under what circumstances any of these calls could fail

Tusker/Views/CopyableLable.swift

@@ -1,5 +1,5 @@
 //
-//  CopyableLabel.swift
+//  CopyableLable.swift
 //  Tusker
 //
 //  Created by Shadowfacts on 2/4/23.
@@ -8,7 +8,7 @@
 
 import UIKit
 
-class CopyableLabel: UILabel {
+class CopyableLable: UILabel {
     
     private var _editMenuInteraction: Any!
     @available(iOS 16.0, *)
@@ -28,10 +28,12 @@ class CopyableLabel: UILabel {
     }
     
     private func commonInit() {
-        editMenuInteraction = UIEditMenuInteraction(delegate: nil)
-        addInteraction(editMenuInteraction)
-        isUserInteractionEnabled = true
-        addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(longPressed)))
+        if #available(iOS 16.0, *) {
+            editMenuInteraction = UIEditMenuInteraction(delegate: nil)
+            addInteraction(editMenuInteraction)
+            isUserInteractionEnabled = true
+            addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(longPressed)))
+        }
     }
     
     override func copy(_ sender: Any?) {

Tusker/Views/Profile Header/ProfileHeaderView.xib

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="23094" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="32700.99.1234" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
     <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="23084"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="22685"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
@@ -124,16 +125,16 @@
                     </constraints>
                 </stackView>
                 <stackView opaque="NO" contentMode="scaleToFill" alignment="center" spacing="4" translatesAutoresizingMaskIntoConstraints="NO" id="jwU-EH-hmC">
-                    <rect key="frame" x="144" y="235" width="101.5" height="23"/>
+                    <rect key="frame" x="144" y="235" width="103.5" height="23"/>
                     <subviews>
-                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" verticalCompressionResistancePriority="751" text="@username" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1C3-Pd-QiL" customClass="CopyableLabel" customModule="Tusker" customModuleProvider="target">
+                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" verticalCompressionResistancePriority="751" text="@username" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1C3-Pd-QiL" customClass="CopyableLable" customModule="Tusker" customModuleProvider="target">
                             <rect key="frame" x="0.0" y="2.5" width="81" height="18"/>
                             <fontDescription key="fontDescription" type="system" weight="light" pointSize="15"/>
                             <color key="textColor" systemColor="secondaryLabelColor"/>
                             <nil key="highlightedColor"/>
                         </label>
                         <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" horizontalCompressionResistancePriority="751" image="lock.fill" catalog="system" translatesAutoresizingMaskIntoConstraints="NO" id="KNY-GD-beC">
-                            <rect key="frame" x="85" y="1.5" width="16.5" height="19.5"/>
+                            <rect key="frame" x="85" y="1.5" width="18.5" height="19.5"/>
                             <color key="tintColor" systemColor="secondaryLabelColor"/>
                             <preferredSymbolConfiguration key="preferredSymbolConfiguration" weight="light"/>
                         </imageView>
@@ -186,14 +187,14 @@
         </view>
     </objects>
     <resources>
-        <image name="ellipsis" catalog="system" width="32" height="32"/>
-        <image name="lock.fill" catalog="system" width="32" height="32"/>
-        <image name="person.badge.plus" catalog="system" width="32" height="32"/>
+        <image name="ellipsis" catalog="system" width="128" height="37"/>
+        <image name="lock.fill" catalog="system" width="125" height="128"/>
+        <image name="person.badge.plus" catalog="system" width="128" height="124"/>
         <systemColor name="labelColor">
             <color white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
         </systemColor>
         <systemColor name="secondaryLabelColor">
-            <color red="0.23529411764705882" green="0.23529411764705882" blue="0.2627450980392157" alpha="0.59999999999999998" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.23529411759999999" green="0.23529411759999999" blue="0.26274509800000001" alpha="0.59999999999999998" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
         <systemColor name="systemBackgroundColor">
             <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>

Tusker/Views/Status/ConversationMainStatusCollectionViewCell.swift

@@ -143,7 +143,10 @@ class ConversationMainStatusCollectionViewCell: UICollectionViewListCell, Status
         $0.isEditable = false
         $0.isSelectable = true
         $0.emojiFont = ConversationMainStatusCollectionViewCell.contentFont
-        $0.dataDetectorTypes = [.flightNumber, .address, .shipmentTrackingNumber, .phoneNumber, .money, .physicalValue]
+        $0.dataDetectorTypes = [.flightNumber, .address, .shipmentTrackingNumber, .phoneNumber]
+        if #available(iOS 16.0, *) {
+            $0.dataDetectorTypes.formUnion([.money, .physicalValue])
+        }
     }
     
     private var translateButton: TranslateButton?