Add jump to present button to timelines

Tusker.xcodeproj/project.pbxproj

@@ -298,6 +298,7 @@
 		D6C3F4F9298EDBF20009FCFF /* ConversationTree.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F4F8298EDBF20009FCFF /* ConversationTree.swift */; };
 		D6C3F4FB299035650009FCFF /* TrendsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F4FA299035650009FCFF /* TrendsViewController.swift */; };
 		D6C3F5172991C1A00009FCFF /* View+AppListStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F5162991C1A00009FCFF /* View+AppListStyle.swift */; };
+		D6C3F5192991F5D60009FCFF /* TimelineJumpButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C3F5182991F5D60009FCFF /* TimelineJumpButton.swift */; };
 		D6C693EF216192C2007D6A6D /* TuskerNavigationDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693EE216192C2007D6A6D /* TuskerNavigationDelegate.swift */; };
 		D6C693FC2162FE6F007D6A6D /* LoadingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693FB2162FE6F007D6A6D /* LoadingViewController.swift */; };
 		D6C693FE2162FEEA007D6A6D /* UIViewController+Children.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6C693FD2162FEEA007D6A6D /* UIViewController+Children.swift */; };
@@ -710,6 +711,7 @@
 		D6C3F4F8298EDBF20009FCFF /* ConversationTree.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationTree.swift; sourceTree = "<group>"; };
 		D6C3F4FA299035650009FCFF /* TrendsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrendsViewController.swift; sourceTree = "<group>"; };
 		D6C3F5162991C1A00009FCFF /* View+AppListStyle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "View+AppListStyle.swift"; sourceTree = "<group>"; };
+		D6C3F5182991F5D60009FCFF /* TimelineJumpButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelineJumpButton.swift; sourceTree = "<group>"; };
 		D6C693EE216192C2007D6A6D /* TuskerNavigationDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TuskerNavigationDelegate.swift; sourceTree = "<group>"; };
 		D6C693FB2162FE6F007D6A6D /* LoadingViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoadingViewController.swift; sourceTree = "<group>"; };
 		D6C693FD2162FEEA007D6A6D /* UIViewController+Children.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIViewController+Children.swift"; sourceTree = "<group>"; };
@@ -1050,6 +1052,7 @@
 				D66C900A28DAB7FD00217BF2 /* TimelineViewController.swift */,
 				D6ADB6E728E8C878009924AB /* PublicTimelineDescriptionCollectionViewCell.swift */,
 				D6D12B2E2925D66500D528E1 /* TimelineGapCollectionViewCell.swift */,
+				D6C3F5182991F5D60009FCFF /* TimelineJumpButton.swift */,
 			);
 			path = Timeline;
 			sourceTree = "<group>";
@@ -2090,6 +2093,7 @@
 				D6CA8CDE296387310050C433 /* SaveToPhotosActivity.swift in Sources */,
 				D6B936712829F72900237D0E /* NSManagedObjectContext+Helpers.swift in Sources */,
 				D68A76EE295369C7001DA1B3 /* AcknowledgementsView.swift in Sources */,
+				D6C3F5192991F5D60009FCFF /* TimelineJumpButton.swift in Sources */,
 				D63CC7102911F1E4000E19DE /* UIScrollView+Top.swift in Sources */,
 				D6F6A557291F4F1600F496A8 /* MuteAccountView.swift in Sources */,
 				D65B4B8B297879E900DABDFB /* AccountFollowsViewController.swift in Sources */,

Tusker/Screens/FindInstanceViewController.swift

@@ -50,7 +50,7 @@ class FindInstanceViewController: InstanceSelectorTableViewController {
 extension FindInstanceViewController: InstanceSelectorTableViewControllerDelegate {
     func didSelectInstance(url: URL) {
         let instanceTimelineController = InstanceTimelineViewController(for: url, parentMastodonController: parentMastodonController!)
-        instanceTimelineController.delegate = instanceTimelineDelegate
+        instanceTimelineController.instanceTimelineDelegate = instanceTimelineDelegate
         instanceTimelineController.browsingEnabled = false
         show(instanceTimelineController, sender: self)
     }

Tusker/Screens/Timeline/InstanceTimelineViewController.swift

@@ -16,7 +16,7 @@ protocol InstanceTimelineViewControllerDelegate: AnyObject {
 
 class InstanceTimelineViewController: TimelineViewController {
     
-    weak var delegate: InstanceTimelineViewControllerDelegate?
+    weak var instanceTimelineDelegate: InstanceTimelineViewControllerDelegate?
 
     weak var parentMastodonController: MastodonController?
     
@@ -145,10 +145,10 @@ class InstanceTimelineViewController: TimelineViewController {
         let existing = try? context.fetch(req).first
         if let existing = existing {
             context.delete(existing)
-            delegate?.didUnsaveInstance(url: instanceURL)
+            instanceTimelineDelegate?.didUnsaveInstance(url: instanceURL)
         } else {
             _ = SavedInstance(url: instanceURL, account: parentMastodonController!.accountInfo!, context: context)
-            delegate?.didSaveInstance(url: instanceURL)
+            instanceTimelineDelegate?.didSaveInstance(url: instanceURL)
         }
         mastodonController.persistentContainer.save(context: context)
     }

Tusker/Screens/Timeline/TimelineJumpButton.swift

@@ -0,0 +1,175 @@
+//
+//  TimelineJumpButton.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 2/6/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+class TimelineJumpButton: UIView {
+    
+    var action: ((Mode) async -> Void)?
+    
+    override var intrinsicContentSize: CGSize {
+        CGSize(width: UIView.noIntrinsicMetric, height: 44)
+    }
+    
+    private let button: UIButton = {
+        var config = UIButton.Configuration.plain()
+        config.image = UIImage(systemName: "arrow.up")
+        config.contentInsets = .zero
+        return UIButton(configuration: config)
+    }()
+    
+    private(set) var mode = Mode.jump
+    var offscreen = false {
+        didSet {
+            updateOffscreenTransform()
+        }
+    }
+    private(set) var isSyncing = false
+    
+    init() {
+        super.init(frame: .zero)
+        
+        layer.masksToBounds = true
+        
+        button.addAction(UIAction(handler: { [unowned self] _ in
+            Task {
+                switch self.mode {
+                case .jump:
+                    await self.jumpAction()
+                case .sync:
+                    await self.syncAction()
+                }
+            }
+        }), for: .touchUpInside)
+        
+        button.translatesAutoresizingMaskIntoConstraints = false
+        addSubview(button)
+        NSLayoutConstraint.activate([
+            button.leadingAnchor.constraint(equalTo: leadingAnchor),
+            button.trailingAnchor.constraint(equalTo: trailingAnchor),
+            button.topAnchor.constraint(equalTo: topAnchor),
+            button.bottomAnchor.constraint(equalTo: bottomAnchor),
+        ])
+        
+        let jumpToPresentAction = UIAction(title: "Jump to Present", image: UIImage(systemName: "arrow.up")) { [unowned self] _ in
+            Task {
+                self.setMode(.jump, animated: false)
+                await self.jumpAction()
+            }
+        }
+        jumpToPresentAction.accessibilityAttributedLabel = TimelinesPageViewController.jumpToPresentTitle
+        
+        button.menu = UIMenu(children: [
+            jumpToPresentAction,
+            UIAction(title: "Sync Position", image: UIImage(systemName: "arrow.triangle.2.circlepath"), handler: { [unowned self] _ in
+                Task {
+                    self.setMode(.sync, animated: false)
+                    await self.syncAction()
+                }
+            })
+        ])
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        updateOffscreenTransform()
+    }
+    
+    private func updateOffscreenTransform() {
+        if offscreen {
+            button.transform = CGAffineTransform(translationX: 0, y: button.bounds.height)
+        } else {
+            button.transform = .identity
+        }
+    }
+    
+    func setMode(_ mode: Mode, animated: Bool) {
+        guard self.mode != mode else {
+            return
+        }
+        self.mode = mode
+        
+        var config = UIButton.Configuration.plain()
+        config.contentInsets = .zero
+        switch mode {
+        case .jump:
+            config.image = UIImage(systemName: "arrow.up")
+        case .sync:
+            config.image = UIImage(systemName: "arrow.triangle.2.circlepath")
+        }
+        
+        if animated,
+           let snapshot = button.snapshotView(afterScreenUpdates: false) {
+            snapshot.translatesAutoresizingMaskIntoConstraints = false
+            addSubview(snapshot)
+            NSLayoutConstraint.activate([
+                snapshot.centerXAnchor.constraint(equalTo: centerXAnchor),
+                snapshot.centerYAnchor.constraint(equalTo: centerYAnchor),
+            ])
+            button.configuration = config
+            button.layer.opacity = 0
+            UIView.animate(withDuration: 0.5, delay: 0) {
+                self.button.layer.opacity = 1
+                snapshot.layer.opacity = 0
+            } completion: { _ in
+                snapshot.removeFromSuperview()
+            }
+        } else {
+            button.configuration = config
+        }
+    }
+    
+    private func jumpAction() async {
+        button.isUserInteractionEnabled = false
+        var config = button.configuration!
+        config.showsActivityIndicator = true
+        button.configuration = config
+        
+        await action?(.jump)
+        
+        config.showsActivityIndicator = false
+        button.configuration = config
+        button.isUserInteractionEnabled = true
+    }
+    
+    private func syncAction() async {
+        isSyncing = true
+        button.isUserInteractionEnabled = false
+        UIView.animateKeyframes(withDuration: 1, delay: 0, options: .repeat) {
+            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5) {
+                self.button.imageView!.transform = CGAffineTransform(rotationAngle: 0.5 * .pi)
+            }
+            UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5) {
+                // the translation is because the symbol isn't perfectly centered
+                self.button.imageView!.transform = CGAffineTransform(translationX: -0.5, y: 0).rotated(by: .pi)
+            }
+        } completion: { _ in
+        }
+
+        await action?(.sync)
+        
+        button.imageView!.layer.removeAllAnimations()
+        button.imageView!.transform = .identity
+        button.isUserInteractionEnabled = true
+        isSyncing = false
+        setMode(.jump, animated: true)
+    }
+    
+}
+
+extension TimelineJumpButton {
+    enum Mode {
+        case jump
+        case sync
+    }
+}

Tusker/Screens/Timeline/TimelineViewController.swift

@@ -11,7 +11,23 @@ import Pachyderm
 import Combine
 import Sentry
 
+protocol TimelineViewControllerDelegate: AnyObject {
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowJumpToPresentToastWith animator: UIViewPropertyAnimator?)
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissJumpToPresentToastWith animator: UIViewPropertyAnimator?)
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowSyncToastWith animator: UIViewPropertyAnimator?)
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissSyncToastWith animator: UIViewPropertyAnimator?)
+}
+
+extension TimelineViewControllerDelegate {
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowJumpToPresentToastWith animator: UIViewPropertyAnimator?) {}
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissJumpToPresentToastWith animator: UIViewPropertyAnimator?) {}
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowSyncToastWith animator: UIViewPropertyAnimator?) {}
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissSyncToastWith animator: UIViewPropertyAnimator?) {}
+}
+
 class TimelineViewController: UIViewController, TimelineLikeCollectionViewController, CollectionViewController, RefreshableViewController {
+    weak var delegate: TimelineViewControllerDelegate?
+    
     let timeline: Timeline
     weak var mastodonController: MastodonController!
     let filterer: Filterer
@@ -145,7 +161,9 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             }
             .debounce(for: .milliseconds(500), scheduler: DispatchQueue.main)
             .sink { [unowned self] _ in
-                _ = syncPositionIfNecessary(alwaysPrompt: true)
+                Task {
+                    _ = await syncPositionIfNecessary(alwaysPrompt: true)
+                }
             }
             .store(in: &cancellables)
         NotificationCenter.default.addObserver(self, selector: #selector(handleStatusDeleted), name: .statusDeleted, object: nil)
@@ -227,7 +245,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         if case .notLoadedInitial = controller.state {
             Task {
                 if await restoreState() {
-                    await checkPresent(jumpImmediately: false)
+                    await checkPresent(jumpImmediately: false, animateImmediateJump: false)
                 } else {
                     await controller.loadInitial()
                 }
@@ -359,28 +377,12 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     
     @MainActor
     private func loadStatusesToRestore(position: TimelinePosition) async -> Bool {
-        {
-            let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
-            crumb.message = "Original statusIDs before filtering"
-            crumb.data = [
-                "statusIDs": position.statusIDs,
-            ]
-            SentrySDK.addBreadcrumb(crumb)
-        }()
         let originalPositionStatusIDs = position.statusIDs
         
         let unloaded = position.statusIDs.filter({ mastodonController.persistentContainer.status(for: $0) == nil })
         guard !unloaded.isEmpty else {
             return true
         }
-        {
-            let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
-            crumb.message = "Unloaded ids"
-            crumb.data = [
-                "unloaded": unloaded
-            ]
-            SentrySDK.addBreadcrumb(crumb)
-        }()
         let results = await withTaskGroup(of: (String, Result<Status, Swift.Error>).self) { group -> [(String, Result<Status, Swift.Error>)] in
             for id in unloaded {
                 group.addTask {
@@ -401,9 +403,6 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             switch result {
             case .success(let status):
                 statuses.append(status)
-                let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
-                crumb.message = "Loaded status \(id)"
-                SentrySDK.addBreadcrumb(crumb)
             case .failure(let error):
                 let crumb = Breadcrumb(level: .error, category: "TimelineViewController")
                 crumb.message = "Error loading status"
@@ -416,15 +415,6 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         }
         await mastodonController.persistentContainer.addAll(statuses: statuses, in: mastodonController.persistentContainer.viewContext)
         
-        _ = {
-            let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
-            crumb.message = "Position statusIDs before filtering"
-            crumb.data = [
-                "statusIDs": position.statusIDs,
-            ]
-            SentrySDK.addBreadcrumb(crumb)
-        }()
-        
         // if an icloud sync completed in between starting to load the statuses and finishing, try to load again
         if position.statusIDs != originalPositionStatusIDs {
             let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
@@ -446,15 +436,6 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             !unloaded.contains(id) || statuses.contains(where: { $0.id == id })
         }
         
-        {
-            let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
-            crumb.message = "Filtered position statusIDs"
-            crumb.data = [
-                "statusIDs": position.statusIDs,
-            ]
-            SentrySDK.addBreadcrumb(crumb)
-        }()
-        
         return !position.statusIDs.isEmpty
     }
     
@@ -565,7 +546,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         saveState()
     }
     
-    private func syncPositionIfNecessary(alwaysPrompt: Bool) -> Bool {
+    func syncPositionIfNecessary(alwaysPrompt: Bool) async -> Bool {
         guard persistsState,
               let timelinePosition = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) else {
             return false
@@ -593,9 +574,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
         }
         stateRestorationLogger.info("Potential restore with centerStatusID: \(timelinePosition.centerStatusID ?? "<none>")")
         if !alwaysPrompt {
-            Task {
             _ = await restoreState()
-            }
         } else {
             var config = ToastConfiguration(title: "Sync Position")
             config.edge = .top
@@ -617,6 +596,12 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                     toast.dismissToast(animated: true)
                 }
             }
+            config.onAppear = { [unowned self] animator in
+                self.delegate?.timelineViewController(self, willShowSyncToastWith: animator)
+            }
+            config.onDismiss = { [unowned self] animator in
+                self.delegate?.timelineViewController(self, willDismissSyncToastWith: animator)
+            }
             showToast(configuration: config, animated: true)
             UIAccessibility.post(notification: .announcement, argument: "Synced Position Updated")
         }
@@ -654,32 +639,33 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             return
         }
         self.disappearedAt = nil
-        if syncPositionIfNecessary(alwaysPrompt: false) {
+        Task {
+            if await syncPositionIfNecessary(alwaysPrompt: false) {
                 // no-op
             } else {
-            Task {
+                await checkPresent(jumpImmediately: false, animateImmediateJump: false)
-                await checkPresent(jumpImmediately: false)
             }
         }
     }
     
-    func checkPresent(jumpImmediately: Bool) async {
+    func checkPresent(jumpImmediately: Bool, animateImmediateJump: Bool) async {
-        if case .idle = controller.state,
+        guard case .idle = controller.state,
               let presentItems = try? await loadInitial(),
-           !presentItems.isEmpty {
+              !presentItems.isEmpty else {
+            return
+        }
         if jumpImmediately {
             var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
             snapshot.appendSections([.statuses])
             snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
-                dataSource.apply(snapshot, animatingDifferences: false) {
+            dataSource.apply(snapshot, animatingDifferences: animateImmediateJump) {
-                    self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: false)
+                self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: animateImmediateJump)
                 UIAccessibility.post(notification: .screenChanged, argument: self.collectionView.cellForItem(at: IndexPath(row: 0, section: 0)))
             }
         } else {
             insertPresentItemsAndShowJumpToast(presentItems)
         }
     }
-    }
     
     private func insertPresentItemsAndShowJumpToast(_ presentItems: [String]) {
         var snapshot = dataSource.snapshot()
@@ -780,6 +766,12 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                     self.showToast(configuration: config, animated: true)
                 }
             }
+            config.onAppear = { [unowned self] animator in
+                self.delegate?.timelineViewController(self, willShowJumpToPresentToastWith: animator)
+            }
+            config.onDismiss = { [unowned self] animator in
+                self.delegate?.timelineViewController(self, willDismissJumpToPresentToastWith: animator)
+            }
             self.showToast(configuration: config, animated: true)
         }
     }

Tusker/Screens/Timeline/TimelinesPageViewController.swift

@@ -13,12 +13,22 @@ import Combine
 
 class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageViewController.Page> {
 
+    static let jumpToPresentTitle: NSAttributedString = {
+        let s = NSMutableAttributedString("Jump to Present")
+        // otherwise it pronounces it as 'pɹizˈənt'
+        // its IPA is also bad, this should be an alveolar approximant not a trill
+        s.addAttribute(.accessibilitySpeechIPANotation, value: "ˈprɛ.zənt", range: NSRange(location: "Jump to ".count, length: "Present".count))
+        return s
+    }()
+    
     private let homeTitle = NSLocalizedString("Home", comment: "home timeline tab title")
     private let federatedTitle = NSLocalizedString("Federated", comment: "federated timeline tab title")
     private let localTitle = NSLocalizedString("Local", comment: "local timeline tab title")
     
     weak var mastodonController: MastodonController!
     
+    private let jumpButton = TimelineJumpButton()
+    
     private var cancellables = Set<AnyCancellable>()
     
     init(mastodonController: MastodonController) {
@@ -46,30 +56,17 @@ class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageView
         customizeItem.accessibilityLabel = "Customize Timelines"
         navigationItem.rightBarButtonItem = customizeItem
         
-        let jumpToPresentName = NSMutableAttributedString("Jump to Present")
+        jumpButton.action = { [unowned self] mode in
-        // otherwise it pronounces it as 'pɹizˈənt'
+            switch mode {
-        // its IPA is also bad, this should be an alveolar approximant not a trill
+            case .jump:
-        jumpToPresentName.addAttribute(.accessibilitySpeechIPANotation, value: "ˈprɛ.zənt", range: NSRange(location: "Jump to ".count, length: "Present".count))
+                await (self.currentViewController as! TimelineViewController).checkPresent(jumpImmediately: true, animateImmediateJump: true)
-        segmentedControl.accessibilityCustomActions = [
+            case .sync:
-            UIAccessibilityCustomAction(attributedName: jumpToPresentName, actionHandler: { [unowned self] _ in
+                _ = await (self.currentViewController as! TimelineViewController).syncPositionIfNecessary(alwaysPrompt: false)
-                guard let vc = currentViewController as? TimelineViewController else {
-                    return false
             }
-                Task {
-                    await vc.checkPresent(jumpImmediately: true)
         }
-                return true
+        let jumpItem = UIBarButtonItem(customView: jumpButton)
-            }),
+        jumpItem.accessibilityAttributedLabel = Self.jumpToPresentTitle
-            UIAccessibilityCustomAction(name: "Jump to Sync Position", actionHandler: { [unowned self] _ in
+        navigationItem.leftBarButtonItem = jumpItem
-                guard let vc = currentViewController as? TimelineViewController else {
-                    return false
-                }
-                Task {
-                    _ = await vc.restoreState()
-                }
-                return true
-            }),
-        ]
         
         mastodonController.accountPreferences.publisher(for: \.pinnedTimelinesData)
             .map { _ in () }
@@ -87,6 +84,23 @@ class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageView
         fatalError("init(coder:) has not been implemented")
     }
     
+    override func configureViewController(_ viewController: UIViewController) {
+        let vc = viewController as! TimelineViewController
+        vc.delegate = self
+    }
+    
+    override func selectPage(_ page: Page, animated: Bool) {
+        super.selectPage(page, animated: animated)
+        if jumpButton.offscreen {
+            jumpButton.setMode(.jump, animated: false)
+            UIView.animate(withDuration: 0.2, delay: 0) {
+                self.jumpButton.offscreen = false
+            }
+        } else {
+            jumpButton.setMode(.jump, animated: true)
+        }
+    }
+    
     func selectTimeline(_ timeline: PinnedTimeline, animated: Bool) {
         self.selectPage(Page(mastodonController: mastodonController, timeline: timeline), animated: animated)
     }
@@ -136,3 +150,75 @@ extension TimelinesPageViewController {
         }
     }
 }
+
+extension TimelinesPageViewController: TimelineViewControllerDelegate {
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowJumpToPresentToastWith animator: UIViewPropertyAnimator?) {
+        guard timelineViewController === currentViewController else {
+            return
+        }
+        if let animator {
+            animator.addAnimations {
+                self.jumpButton.offscreen = true
+            }
+        } else {
+            self.jumpButton.offscreen = true
+        }
+    }
+    
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissJumpToPresentToastWith animator: UIViewPropertyAnimator?) {
+        guard timelineViewController === currentViewController else {
+            return
+        }
+        jumpButton.setMode(.jump, animated: false)
+        if let animator {
+            animator.addAnimations {
+                self.jumpButton.offscreen = false
+            }
+        } else {
+            self.jumpButton.offscreen = false
+        }
+    }
+    
+    func timelineViewController(_ timelineViewController: TimelineViewController, willShowSyncToastWith animator: UIViewPropertyAnimator?) {
+        guard timelineViewController === currentViewController else {
+            return
+        }
+        if let animator {
+            animator.addAnimations {
+                self.jumpButton.offscreen = true
+            }
+        } else {
+            self.jumpButton.offscreen = true
+        }
+    }
+    
+    func timelineViewController(_ timelineViewController: TimelineViewController, willDismissSyncToastWith animator: UIViewPropertyAnimator?) {
+        guard timelineViewController === currentViewController else {
+            return
+        }
+        
+        jumpButton.setMode(.sync, animated: false)
+        func resetJumpButtonMode() {
+            DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(5)) { [weak self] in
+                guard let self,
+                      timelineViewController === self.currentViewController,
+                      !self.jumpButton.isSyncing else { return }
+                self.jumpButton.setMode(.jump, animated: true)
+            }
+        }
+        
+        if let animator {
+            animator.addAnimations {
+                self.jumpButton.offscreen = false
+            }
+            animator.addCompletion { position in
+                if position == .end {
+                    resetJumpButtonMode()
+                }
+            }
+        } else {
+            self.jumpButton.offscreen = false
+            resetJumpButtonMode()
+        }
+    }
+}

Tusker/Screens/Utilities/SegmentedPageViewController.swift

@@ -94,6 +94,9 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIView
         }
     }
     
+    func configureViewController(_ viewController: UIViewController) {
+    }
+    
     func selectPage(_ page: Page, animated: Bool) {
         guard pages.contains(page) else {
             fatalError("invalid page \(page) that is not in SegmentedPageViewController.pages")
@@ -116,6 +119,7 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIView
             newController = existing
         } else {
             newController = pageProvider(page)
+            configureViewController(newController)
             pageControllers[page] = newController
         }
         
@@ -130,7 +134,16 @@ class SegmentedPageViewController<Page: SegmentedPageViewControllerPage>: UIView
               animated != .none else {
             currentViewController?.removeViewAndController()
             newViewController.view.translatesAutoresizingMaskIntoConstraints = false
-            embedChild(newViewController)
+            // don't use embedChild here because it triggers an appearance transition, even though this vc hasn't appeared yet
+            addChild(newViewController)
+            view.addSubview(newViewController.view)
+            NSLayoutConstraint.activate([
+                newViewController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+                newViewController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+                newViewController.view.topAnchor.constraint(equalTo: view.topAnchor),
+                newViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            ])
+            newViewController.didMove(toParent: self)
             self.currentViewController = newViewController
             return
         }

Tusker/Views/Toast/ToastConfiguration.swift

@@ -22,6 +22,8 @@ struct ToastConfiguration {
     var edge: Edge = .automatic
     var dismissOnScroll = true
     var dismissAutomaticallyAfter: TimeInterval? = nil
+    var onAppear: ((UIViewPropertyAnimator?) -> Void)?
+    var onDismiss: ((UIViewPropertyAnimator?) -> Void)?
     
     init(title: String) {
         self.title = title

Tusker/Views/Toast/ToastView.swift

@@ -127,22 +127,30 @@ class ToastView: UIView {
     func dismissToast(animated: Bool) {
         guard animated else {
             removeFromSuperview()
+            configuration.onDismiss?(nil)
             return
         }
-        UIView.animate(withDuration: 0.25, delay: 0, options: .curveEaseInOut) {
+        let animator = UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
+        animator.addAnimations {
             self.transform = CGAffineTransform(translationX: 0, y: self.offscreenTranslation)
-        } completion: { (_) in
+        }
+        animator.addCompletion { _ in
             self.removeFromSuperview()
         }
+        configuration.onDismiss?(animator)
+        animator.startAnimation()
     }
     
     func animateAppearance() {
         self.transform = CGAffineTransform(translationX: 0, y: offscreenTranslation)
         let duration = 0.5
-        let velocity = 0.5
+        let velocity = CGVector(dx: 0, dy: 0.5)
-        UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 0.65, initialSpringVelocity: velocity, options: []) {
+        let animator = UIViewPropertyAnimator(duration: duration, timingParameters: UISpringTimingParameters(dampingRatio: 0.65, initialVelocity: velocity))
+        animator.addAnimations {
             self.transform = .identity
         }
+        configuration.onAppear?(animator)
+        animator.startAnimation()
     }
     
     func setupDismissOnScroll(connectedTo scrollView: UIScrollView) {
@@ -184,11 +192,14 @@ class ToastView: UIView {
         shrinkAnimator = nil
     }
     
+    private var panGestureDismissAnimator: UIViewPropertyAnimator?
+    
     @objc private func panRecognized(_ recognizer: UIPanGestureRecognizer) {
         let translation = recognizer.translation(in: self).y
         
         let isDraggingAwayFromDismissalEdge = (configuration.edge == .top && translation > 0) || (configuration.edge == .bottom && translation < 0)
         
+        
         switch recognizer.state {
         case .began:
             recognizedGesture = true
@@ -196,19 +207,25 @@ class ToastView: UIView {
             UIView.animate(withDuration: 0.1, delay: 0, options: [.curveEaseInOut, .allowUserInteraction]) {
                 self.transform = .identity
             }
-            break
+            panGestureDismissAnimator = UIViewPropertyAnimator(duration: 0.2, curve: .easeInOut)
+            configuration.onDismiss?(panGestureDismissAnimator!)
             
         case .changed:
             var distance: CGFloat
+            var alongsideAnimationProgress: CGFloat
             if isDraggingAwayFromDismissalEdge {
                 distance = sqrt(abs(translation))
                 if configuration.edge == .bottom {
                     distance *= -1
                 }
+                alongsideAnimationProgress = 0
             } else {
                 distance = translation
+                alongsideAnimationProgress = abs(translation) / (configuration.edgeSpacing + bounds.height)
             }
+            
             transform = CGAffineTransform(translationX: 0, y: distance)
+            panGestureDismissAnimator!.fractionComplete = alongsideAnimationProgress
             
         case .ended, .cancelled:
             let velocity = recognizer.velocity(in: self).y
@@ -219,27 +236,31 @@ class ToastView: UIView {
             
             let minDismissalVelocity: CGFloat = 250
             let dismissDueToVelocity = configuration.edge == .bottom ? velocity > minDismissalDistance : velocity < -minDismissalVelocity
+            
             if dismissDueToDistance || dismissDueToVelocity {
                 
                 if abs(translation) < abs(offscreenTranslation) {
-                    let distanceLeft = offscreenTranslation - translation
+                    panGestureDismissAnimator!.addAnimations {
-                    let duration = 1 / TimeInterval(max(velocity, minDismissalVelocity) / distanceLeft)
-                
-                    UIView.animate(withDuration: duration, delay: 0, options: .allowUserInteraction) {
                         self.transform = CGAffineTransform(translationX: 0, y: self.offscreenTranslation)
-                    } completion: { (_) in
+                    }
+                    panGestureDismissAnimator!.addCompletion { _ in
                         self.removeFromSuperview()
                     }
                 } else {
                     self.removeFromSuperview()
                 }
                 
+                panGestureDismissAnimator!.startAnimation()
+                
             } else {
                 let duration = 0.5
                 let velocity = distance * duration
                 UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 0.65, initialSpringVelocity: velocity, options: .allowUserInteraction) {
                     self.transform = .identity
                 }
+                
+                panGestureDismissAnimator!.isReversed = true
+                panGestureDismissAnimator!.startAnimation()
             }
             
         default:

Tusker/Views/Toast/ToastableViewController.swift

@@ -77,6 +77,8 @@ extension ToastableViewController {
         
         if animated {
             toast.animateAppearance()
+        } else {
+            config.onAppear?(nil)
         }
         
         if config.dismissOnScroll,