Use new UITabBarController API on iOS 18

Packages/Duckable/Sources/Duckable/API.swift

@@ -33,11 +33,11 @@ public enum DuckAttemptAction {
 
 extension UIViewController {
     @available(iOS 16.0, *)
-    public func presentDuckable(_ viewController: DuckableViewController, animated: Bool, isDucked: Bool = false) -> Bool {
+    public func presentDuckable(_ viewController: DuckableViewController, animated: Bool, isDucked: Bool = false, completion: (() -> Void)? = nil) -> Bool {
         var cur: UIViewController? = self
         while let vc = cur {
             if let container = vc as? DuckableContainerViewController {
-                container.presentDuckable(viewController, animated: animated, isDucked: isDucked, completion: nil)
+                container._presentDuckable(viewController, animated: animated, isDucked: isDucked, completion: completion)
                 return true
             } else {
                 cur = vc.parent

Packages/Duckable/Sources/Duckable/DuckableContainerViewController.swift

@@ -58,7 +58,7 @@ public class DuckableContainerViewController: UIViewController {
         ])
     }
     
-    func presentDuckable(_ viewController: DuckableViewController, animated: Bool, isDucked: Bool, completion: (() -> Void)?) {
+    func _presentDuckable(_ viewController: DuckableViewController, animated: Bool, isDucked: Bool, completion: (() -> Void)?) {
         guard case .idle = state else {
             if animated,
                case .ducked(_, placeholder: let placeholder) = state {

Tusker.xcodeproj/project.pbxproj

@@ -129,6 +129,8 @@
 		D646DCD82A07F3500059ECEB /* FollowRequestNotificationCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCD72A07F3500059ECEB /* FollowRequestNotificationCollectionViewCell.swift */; };
 		D646DCDA2A081A2C0059ECEB /* PollFinishedNotificationCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCD92A081A2C0059ECEB /* PollFinishedNotificationCollectionViewCell.swift */; };
 		D646DCDC2A081CF10059ECEB /* StatusUpdatedNotificationCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCDB2A081CF10059ECEB /* StatusUpdatedNotificationCollectionViewCell.swift */; };
+		D64A50462C739DC0009D7193 /* NewMainTabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50452C739DC0009D7193 /* NewMainTabBarViewController.swift */; };
+		D64A50482C739DEA009D7193 /* BaseMainTabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50472C739DEA009D7193 /* BaseMainTabBarViewController.swift */; };
 		D64AAE9126C80DC600FC57FB /* ToastView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64AAE9026C80DC600FC57FB /* ToastView.swift */; };
 		D64AAE9526C88C5000FC57FB /* ToastableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64AAE9426C88C5000FC57FB /* ToastableViewController.swift */; };
 		D64AAE9726C88DC400FC57FB /* ToastConfiguration.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64AAE9626C88DC400FC57FB /* ToastConfiguration.swift */; };
@@ -560,6 +562,8 @@
 		D646DCD72A07F3500059ECEB /* FollowRequestNotificationCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FollowRequestNotificationCollectionViewCell.swift; sourceTree = "<group>"; };
 		D646DCD92A081A2C0059ECEB /* PollFinishedNotificationCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PollFinishedNotificationCollectionViewCell.swift; sourceTree = "<group>"; };
 		D646DCDB2A081CF10059ECEB /* StatusUpdatedNotificationCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StatusUpdatedNotificationCollectionViewCell.swift; sourceTree = "<group>"; };
+		D64A50452C739DC0009D7193 /* NewMainTabBarViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NewMainTabBarViewController.swift; sourceTree = "<group>"; };
+		D64A50472C739DEA009D7193 /* BaseMainTabBarViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BaseMainTabBarViewController.swift; sourceTree = "<group>"; };
 		D64AAE9026C80DC600FC57FB /* ToastView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastView.swift; sourceTree = "<group>"; };
 		D64AAE9426C88C5000FC57FB /* ToastableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastableViewController.swift; sourceTree = "<group>"; };
 		D64AAE9626C88DC400FC57FB /* ToastConfiguration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastConfiguration.swift; sourceTree = "<group>"; };
@@ -1124,7 +1128,9 @@
 				D6FF985F255C717400845181 /* AccountSwitchingContainerViewController.swift */,
 				D6BEA246291A0F2D002F4D01 /* Duckable+Root.swift */,
 				D6F0B12A24A3071C001E48C3 /* MainSplitViewController.swift */,
+				D64A50472C739DEA009D7193 /* BaseMainTabBarViewController.swift */,
 				04DACE8B212CB14B009840C4 /* MainTabBarViewController.swift */,
+				D64A50452C739DC0009D7193 /* NewMainTabBarViewController.swift */,
 				D6F0B17424A3A1AA001E48C3 /* MainSidebarViewController.swift */,
 				D6B93666281D937300237D0E /* MainSidebarMyProfileCollectionViewCell.swift */,
 				D68E525A24A3D77E0054355A /* TuskerRootViewController.swift */,
@@ -2141,6 +2147,7 @@
 				D61F75A5293ABD6F00C0B37F /* EditFilterView.swift in Sources */,
 				D6BC9DB1232C61BC002CA326 /* NotificationsPageViewController.swift in Sources */,
 				D6ADB6EC28EA73CB009924AB /* StatusContentContainer.swift in Sources */,
+				D64A50462C739DC0009D7193 /* NewMainTabBarViewController.swift in Sources */,
 				D6969E9E240C81B9002843CE /* NSTextAttachment+Emoji.swift in Sources */,
 				D6D79F532A0FFE3200AB2315 /* ToggleableButton.swift in Sources */,
 				D6BC9DB3232D4C07002CA326 /* WellnessPrefsView.swift in Sources */,
@@ -2193,6 +2200,7 @@
 				D6934F322BA7E43E002B1C8D /* LoadingGalleryContentViewController.swift in Sources */,
 				D68E525B24A3D77E0054355A /* TuskerRootViewController.swift in Sources */,
 				D62D2422217AA7E1005076CC /* UserActivityManager.swift in Sources */,
+				D64A50482C739DEA009D7193 /* BaseMainTabBarViewController.swift in Sources */,
 				D68A76E329524D2A001DA1B3 /* ListMO.swift in Sources */,
 				D63CC70C2910AADB000E19DE /* TuskerSceneDelegate.swift in Sources */,
 				D61F759D2938574B00C0B37F /* FilterRow.swift in Sources */,

Tusker/Scenes/MainSceneDelegate.swift

@@ -63,7 +63,7 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
                 let draft = mastodonController.createDraft()
                 let text = components.queryItems?.first(where: { $0.name == "text" })?.value
                 draft.text = text ?? ""
-                rootViewController.compose(editing: draft, animated: true, isDucked: false)
+                rootViewController.compose(editing: draft, animated: true, isDucked: false, completion: nil)
             }
         } else {
             // Assume anything else is a search query
@@ -266,15 +266,24 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
         mastodonController.initialize()
         
         #if os(visionOS)
+        if #available(visionOS 2.0, *) {
+            return NewMainTabBarViewController(mastodonController: mastodonController)
+        } else {
             return MainTabBarViewController(mastodonController: mastodonController)
+        }
         #else
-        let split = MainSplitViewController(mastodonController: mastodonController)
+        let mainVC: UIViewController & AccountSwitchableViewController
+        if #available(iOS 18.0, *) {
+            mainVC = NewMainTabBarViewController(mastodonController: mastodonController)
+        } else {
+            mainVC = MainSplitViewController(mastodonController: mastodonController)
+        }
         if UIDevice.current.userInterfaceIdiom == .phone,
            #available(iOS 16.0, *) {
             // TODO: maybe the duckable container should be outside the account switching container
-            return DuckableContainerViewController(child: split)
+            return DuckableContainerViewController(child: mainVC)
         } else {
-            return split
+            return mainVC
         }
         #endif
     }

Tusker/Screens/Main/AccountSwitchingContainerViewController.swift

@@ -147,9 +147,9 @@ extension AccountSwitchingContainerViewController: TuskerRootViewController {
         return root.stateRestorationActivity()
     }
     
-    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool) {
+    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool, completion: (() -> Void)?) {
         loadViewIfNeeded()
-        root.compose(editing: draft, animated: animated, isDucked: isDucked)
+        root.compose(editing: draft, animated: animated, isDucked: isDucked, completion: completion)
     }
     
     func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
@@ -157,11 +157,6 @@ extension AccountSwitchingContainerViewController: TuskerRootViewController {
         root.select(route: route, animated: animated, completion: completion)
     }
     
-    func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {
-        loadViewIfNeeded()
-        return root.getTabController(tab: tab)
-    }
-    
     func getNavigationDelegate() -> TuskerNavigationDelegate? {
         loadViewIfNeeded()
         return root.getNavigationDelegate()

Tusker/Screens/Main/BaseMainTabBarViewController.swift

@@ -0,0 +1,184 @@
+//
+//  BaseMainTabBarViewController.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 8/19/24.
+//  Copyright © 2024 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+class BaseMainTabBarViewController: UITabBarController {
+    
+    let mastodonController: MastodonController
+    
+    #if !os(visionOS)
+    private(set) var fastAccountSwitcher: FastAccountSwitcherViewController!
+    private var fastSwitcherIndicator: FastAccountSwitcherIndicatorView!
+    private var fastSwitcherConstraints: [NSLayoutConstraint] = []
+    #endif
+    
+    init(mastodonController: MastodonController) {
+        self.mastodonController = mastodonController
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func show(_ vc: UIViewController, sender: Any?) {
+        if let nav = selectedViewController as? UINavigationController {
+            nav.pushViewController(vc, animated: true)
+        } else {
+            present(vc, animated: true)
+        }
+    }
+
+    // Fast account switcher is not supported on visionOS
+    #if !os(visionOS)
+    func setupFastAccountSwitcher() {
+        fastAccountSwitcher = FastAccountSwitcherViewController()
+        fastAccountSwitcher.delegate = self
+        fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
+        
+        tabBar.addGestureRecognizer(fastAccountSwitcher.createSwitcherGesture())
+        let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(tabBarTapped))
+        tapRecognizer.cancelsTouchesInView = false
+        tabBar.addGestureRecognizer(tapRecognizer)
+        
+        if findMyProfileTabBarButton() != nil {
+            fastSwitcherIndicator = FastAccountSwitcherIndicatorView()
+            fastSwitcherIndicator.translatesAutoresizingMaskIntoConstraints = false
+            view.addSubview(fastSwitcherIndicator)
+        }
+    }
+    
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        
+        // i hate that we have to do this so often :S
+        // but doing it only in viewWillAppear makes it not appear initially
+        // doing it in viewWillAppear inside a DispatchQueue.main.async works initially but then it disappears when long-pressed
+        repositionFastSwitcherIndicator()
+    }
+    
+    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        super.traitCollectionDidChange(previousTraitCollection)
+        
+        repositionFastSwitcherIndicator()
+    }
+    
+    private func repositionFastSwitcherIndicator() {
+        guard let myProfileButton = findMyProfileTabBarButton() else {
+            return
+        }
+        NSLayoutConstraint.deactivate(fastSwitcherConstraints)
+        let isPortrait = view.bounds.width < view.bounds.height
+        if traitCollection.horizontalSizeClass == .compact && isPortrait {
+            fastSwitcherConstraints = [
+                fastSwitcherIndicator.centerYAnchor.constraint(equalTo: myProfileButton.centerYAnchor, constant: -4),
+                // tab bar button image width is 30
+                fastSwitcherIndicator.leftAnchor.constraint(equalTo: myProfileButton.centerXAnchor, constant: 15 + 2),
+            ]
+        } else {
+            fastSwitcherConstraints = [
+                fastSwitcherIndicator.centerYAnchor.constraint(equalTo: myProfileButton.centerYAnchor),
+                fastSwitcherIndicator.trailingAnchor.constraint(equalTo: myProfileButton.trailingAnchor),
+            ]
+        }
+        NSLayoutConstraint.activate(fastSwitcherConstraints)
+    }
+    
+    private func findMyProfileTabBarButton() -> UIView? {
+        let tabBarButtons = tabBar.subviews.filter { String(describing: type(of: $0)).lowercased().contains("button") }
+        let tabCount: Int?
+        if #available(iOS 18.0, *) {
+            tabCount = viewControllers?.count ?? tabs.count
+        } else {
+            tabCount = viewControllers?.count
+        }
+        // sanity check that there is 1 button per VC
+        guard tabBarButtons.count == tabCount,
+              let myProfileButton = tabBarButtons.last else {
+            return nil
+        }
+        return myProfileButton
+    }
+    
+    @objc private func tabBarTapped(_ recognizer: UITapGestureRecognizer) {
+        fastAccountSwitcher.hide()
+    }
+    #endif // !os(visionOS)
+
+}
+
+#if !os(visionOS)
+extension BaseMainTabBarViewController: FastAccountSwitcherViewControllerDelegate {
+    func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController) {
+        fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(fastAccountSwitcher.view)
+        NSLayoutConstraint.activate([
+            fastAccountSwitcher.accountsStack.bottomAnchor.constraint(equalTo: fastAccountSwitcher.view.bottomAnchor),
+            
+            fastAccountSwitcher.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            fastAccountSwitcher.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            fastAccountSwitcher.view.topAnchor.constraint(equalTo: view.topAnchor),
+            fastAccountSwitcher.view.bottomAnchor.constraint(equalTo: tabBar.topAnchor),
+            
+            // The safe area insets don't automatically propagate for some reason, so do it ourselves.
+            fastAccountSwitcher.view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
+            fastAccountSwitcher.view.safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
+        ])
+    }
+    
+    func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool {
+        guard let myProfileButton = findMyProfileTabBarButton() else {
+            return false
+        }
+        let locationInButton = myProfileButton.convert(point, from: tabBar)
+        return myProfileButton.bounds.contains(locationInButton)
+    }
+}
+#endif // !os(visionOS)
+
+extension BaseMainTabBarViewController: TuskerNavigationDelegate {
+    var apiController: MastodonController! { mastodonController }
+}
+
+extension BaseMainTabBarViewController: StateRestorableViewController {
+    func stateRestorationActivity() -> NSUserActivity? {
+        var activity: NSUserActivity?
+        if let presentedNav = presentedViewController as? UINavigationController,
+           let compose = presentedNav.viewControllers.first as? ComposeHostingController {
+            let draft = compose.controller.draft
+            activity = UserActivityManager.editDraftActivity(id: draft.id, accountID: draft.accountID)
+        } else if let vc = (selectedViewController as! UINavigationController).topViewController as? StateRestorableViewController {
+            activity = vc.stateRestorationActivity()
+        }
+        if activity == nil {
+            stateRestorationLogger.fault("MainTabBarViewController: Unable to create state restoration activity, couldn't find StateRestorableViewController")
+        }
+        return activity
+    }
+}
+
+extension BaseMainTabBarViewController: BackgroundableViewController {
+    func sceneDidEnterBackground() {
+        if let selectedVC = selectedViewController as? BackgroundableViewController {
+            selectedVC.sceneDidEnterBackground()
+        }
+    }
+}
+
+extension BaseMainTabBarViewController: StatusBarTappableViewController {
+    func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
+        guard presentedViewController == nil else {
+            return .stop
+        }
+        guard let vc = selectedViewController as? StatusBarTappableViewController else {
+            return .continue
+        }
+        return vc.handleStatusBarTapped(xPosition: xPosition)
+    }
+}

Tusker/Screens/Main/Duckable+Root.swift

@@ -23,8 +23,8 @@ extension DuckableContainerViewController: AccountSwitchableViewController {
         return activity
     }
     
-    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool) {
+    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool, completion: (() -> Void)?) {
-        (child as? TuskerRootViewController)?.compose(editing: draft, animated: animated, isDucked: isDucked)
+        (child as? TuskerRootViewController)?.compose(editing: draft, animated: animated, isDucked: isDucked, completion: completion)
     }
     
     func getNavigationDelegate() -> TuskerNavigationDelegate? {
@@ -39,10 +39,6 @@ extension DuckableContainerViewController: AccountSwitchableViewController {
         (child as? TuskerRootViewController)?.select(route: route, animated: animated, completion: completion)
     }
     
-    func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {
-        return (child as? TuskerRootViewController)?.getTabController(tab: tab)
-    }
-    
     func performSearch(query: String) {
         (child as? TuskerRootViewController)?.performSearch(query: query)
     }

Tusker/Screens/Main/MainSplitViewController.swift

@@ -10,6 +10,7 @@ import UIKit
 import Combine
 import TuskerPreferences
 
+@available(iOS, obsoleted: 18.0)
 class MainSplitViewController: UISplitViewController {
 
     private let mastodonController: MastodonController
@@ -578,20 +579,6 @@ extension MainSplitViewController: TuskerRootViewController {
         completion?()
     }
     
-    func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController? {
-        if traitCollection.horizontalSizeClass == .compact {
-            return tabBarViewController?.getTabController(tab: tab)
-        } else {
-            if tab == .compose {
-                return nil
-            } else if case .tab(tab) = sidebar.selectedItem {
-                return secondaryNavController
-            } else {
-                return nil
-            }
-        }
-    }
-    
     func getNavigationDelegate() -> TuskerNavigationDelegate? {
         if traitCollection.horizontalSizeClass == .compact {
             return tabBarViewController.getNavigationDelegate()

Tusker/Screens/Main/MainTabBarViewController.swift

@@ -9,18 +9,11 @@
 import UIKit
 import ComposeUI
 
-class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
+@available(iOS, obsoleted: 18.0)
-    
+class MainTabBarViewController: BaseMainTabBarViewController {
-    private let mastodonController: MastodonController
     
     private var composePlaceholder: UIViewController!
     
-    #if !os(visionOS)
-    private var fastAccountSwitcher: FastAccountSwitcherViewController!
-    private var fastSwitcherIndicator: FastAccountSwitcherIndicatorView!
-    private var fastSwitcherConstraints: [NSLayoutConstraint] = []
-    #endif
-    
     var currentTab: Tab {
         return Tab(rawValue: selectedIndex)!
     }
@@ -33,16 +26,6 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
         }
     }
     
-    init(mastodonController: MastodonController) {
-        self.mastodonController = mastodonController
-        
-        super.init(nibName: nil, bundle: nil)
-    }
-    
-    required init?(coder: NSCoder) {
-        fatalError("init(coder:) has not been implemented")
-	}
-    
     override func viewDidLoad() {
         super.viewDidLoad()
         
@@ -62,46 +45,13 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
             embedInNavigationController(Tab.myProfile.createViewController(mastodonController)),
         ]
         
-        #if !os(visionOS)
+        setupFastAccountSwitcher()
-        fastAccountSwitcher = FastAccountSwitcherViewController()
-        fastAccountSwitcher.delegate = self
-        fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
-        
-        tabBar.addGestureRecognizer(fastAccountSwitcher.createSwitcherGesture())
-        let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(tabBarTapped))
-        tapRecognizer.cancelsTouchesInView = false
-        tabBar.addGestureRecognizer(tapRecognizer)
-        
-        if findMyProfileTabBarButton() != nil {
-            fastSwitcherIndicator = FastAccountSwitcherIndicatorView()
-            fastSwitcherIndicator.translatesAutoresizingMaskIntoConstraints = false
-            view.addSubview(fastSwitcherIndicator)
-        }
-        #endif
         
         tabBar.isSpringLoaded = true
         
         view.backgroundColor = .appBackground
     }
     
-    // Fast account switcher is not supported on visionOS
-    #if !os(visionOS)
-    override func viewDidLayoutSubviews() {
-        super.viewDidLayoutSubviews()
-        
-        // i hate that we have to do this so often :S
-        // but doing it only in viewWillAppear makes it not appear initially
-        // doing it in viewWillAppear inside a DispatchQueue.main.async works initially but then it disappears when long-pressed
-        repositionFastSwitcherIndicator()
-    }
-    
-    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
-        super.traitCollectionDidChange(previousTraitCollection)
-        
-        repositionFastSwitcherIndicator()
-    }
-    #endif
-    
     func select(tab: Tab, dismissPresented: Bool) {
         if tab == .compose {
             compose(editing: nil)
@@ -119,53 +69,6 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
         }
     }
     
-    override func show(_ vc: UIViewController, sender: Any?) {
-        if let nav = selectedViewController as? UINavigationController {
-            nav.pushViewController(vc, animated: true)
-        } else {
-            present(vc, animated: true)
-        }
-    }
-    
-    #if !os(visionOS)
-    private func repositionFastSwitcherIndicator() {
-        guard let myProfileButton = findMyProfileTabBarButton() else {
-            return
-        }
-        NSLayoutConstraint.deactivate(fastSwitcherConstraints)
-        let isPortrait = view.bounds.width < view.bounds.height
-        if traitCollection.horizontalSizeClass == .compact && isPortrait {
-            fastSwitcherConstraints = [
-                fastSwitcherIndicator.centerYAnchor.constraint(equalTo: myProfileButton.centerYAnchor, constant: -4),
-                // tab bar button image width is 30
-                fastSwitcherIndicator.leftAnchor.constraint(equalTo: myProfileButton.centerXAnchor, constant: 15 + 2),
-            ]
-        } else {
-            fastSwitcherConstraints = [
-                fastSwitcherIndicator.centerYAnchor.constraint(equalTo: myProfileButton.centerYAnchor),
-                fastSwitcherIndicator.trailingAnchor.constraint(equalTo: myProfileButton.trailingAnchor),
-            ]
-        }
-        NSLayoutConstraint.activate(fastSwitcherConstraints)
-    }
-    #endif
-    
-    private func findMyProfileTabBarButton() -> UIView? {
-        let tabBarButtons = tabBar.subviews.filter { String(describing: type(of: $0)).lowercased().contains("button") }
-        // sanity check that there is 1 button per VC
-        guard tabBarButtons.count == viewControllers!.count,
-              let myProfileButton = tabBarButtons.last else {
-            return nil
-        }
-        return myProfileButton
-    }
-    
-    #if !os(visionOS)
-    @objc private func tabBarTapped(_ recognizer: UITapGestureRecognizer) {
-        fastAccountSwitcher.hide()
-    }
-    #endif
-    
     @objc func handleComposeKeyCommand() {
         compose(editing: nil)
     }
@@ -179,22 +82,6 @@ class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
         }
     }
     
-    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
-        if viewController == composePlaceholder {
-            compose(editing: nil)
-            return false
-        }
-        if selectedIndex != NSNotFound,
-           viewController == viewControllers![selectedIndex],
-           let nav = viewController as? UINavigationController,
-           nav.viewControllers.count == 1,
-           let scrollableVC = nav.viewControllers.first as? TabBarScrollableViewController {
-            scrollableVC.tabBarScrollToTop()
-            return false
-        }
-        return true
-    }
-    
     func setViewController(_ viewController: UIViewController, forTab tab: Tab) {
         viewControllers![tab.rawValue] = viewController
     }
@@ -229,7 +116,7 @@ extension MainTabBarViewController {
         }
     }
     
-    func getTabController(tab: Tab) -> UIViewController? {
+    private func getTabController(tab: Tab) -> UIViewController? {
         if tab == .compose {
             return nil
         } else {
@@ -240,53 +127,21 @@ extension MainTabBarViewController {
     }
 }
 
-#if !os(visionOS)
+extension MainTabBarViewController: UITabBarControllerDelegate {
-extension MainTabBarViewController: FastAccountSwitcherViewControllerDelegate {
+    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
-    func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController) {
+        if viewController == composePlaceholder {
-        fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
+            compose(editing: nil)
-        view.addSubview(fastAccountSwitcher.view)
-        NSLayoutConstraint.activate([
-            fastAccountSwitcher.accountsStack.bottomAnchor.constraint(equalTo: fastAccountSwitcher.view.bottomAnchor),
-            
-            fastAccountSwitcher.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
-            fastAccountSwitcher.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-            fastAccountSwitcher.view.topAnchor.constraint(equalTo: view.topAnchor),
-            fastAccountSwitcher.view.bottomAnchor.constraint(equalTo: tabBar.topAnchor),
-            
-            // The safe area insets don't automatically propagate for some reason, so do it ourselves.
-            fastAccountSwitcher.view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
-            fastAccountSwitcher.view.safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
-        ])
-    }
-    
-    func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool {
-        guard let myProfileButton = findMyProfileTabBarButton() else {
             return false
         }
-        let locationInButton = myProfileButton.convert(point, from: tabBar)
+        if selectedIndex != NSNotFound,
-        return myProfileButton.bounds.contains(locationInButton)
+           viewController == viewControllers![selectedIndex],
+           let nav = viewController as? UINavigationController,
+           nav.viewControllers.count == 1,
+           let scrollableVC = nav.viewControllers.first as? TabBarScrollableViewController {
+            scrollableVC.tabBarScrollToTop()
+            return false
         }
-}
+        return true
-#endif
-
-extension MainTabBarViewController: TuskerNavigationDelegate {
-    var apiController: MastodonController! { mastodonController }
-}
-
-extension MainTabBarViewController: StateRestorableViewController {
-    func stateRestorationActivity() -> NSUserActivity? {
-        var activity: NSUserActivity?
-        if let presentedNav = presentedViewController as? UINavigationController,
-           let compose = presentedNav.viewControllers.first as? ComposeHostingController {
-            let draft = compose.controller.draft
-            activity = UserActivityManager.editDraftActivity(id: draft.id, accountID: draft.accountID)
-        } else if let vc = (selectedViewController as! UINavigationController).topViewController as? StateRestorableViewController {
-            activity = vc.stateRestorationActivity()
-        }
-        if activity == nil {
-            stateRestorationLogger.fault("MainTabBarViewController: Unable to create state restoration activity, couldn't find StateRestorableViewController")
-        }
-        return activity
     }
 }
 
@@ -350,24 +205,6 @@ extension MainTabBarViewController: TuskerRootViewController {
         present(vc, animated: true, completion: completion)
         return vc
     }
-    
-    func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
-        guard presentedViewController == nil else {
-            return .stop
-        }
-        guard let vc = viewController(for: currentTab) as? StatusBarTappableViewController else {
-            return .continue
-        }
-        return vc.handleStatusBarTapped(xPosition: xPosition)
-    }
-}
-
-extension MainTabBarViewController: BackgroundableViewController {
-    func sceneDidEnterBackground() {
-        if let selectedVC = selectedViewController as? BackgroundableViewController {
-            selectedVC.sceneDidEnterBackground()
-        }
-    }
 }
 
 extension MainTabBarViewController: AccountSwitchableViewController {

Tusker/Screens/Main/NewMainTabBarViewController.swift

@@ -0,0 +1,222 @@
+//
+//  NewMainTabBarViewController.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 8/19/24.
+//  Copyright © 2024 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+@available(iOS 18.0, *)
+class NewMainTabBarViewController: BaseMainTabBarViewController {
+    
+    private let composePlaceholder = UIViewController()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        mode = .tabSidebar
+        delegate = self
+        tabBar.isSpringLoaded = true
+        view.backgroundColor = .appBackground
+        
+        let viewControllerProvider = { [unowned self] (tab: UITab) -> UIViewController in
+            self.makeViewController(for: tab)
+        }
+        
+        let topLevelTabs = [
+            Tab.home,
+            .notifications,
+            .compose,
+            .explore,
+            .myProfile
+        ].map {
+            UITab(title: $0.title, image: UIImage(systemName: $0.imageName), identifier: $0.rawValue, viewControllerProvider: viewControllerProvider)
+        }
+        
+        self.tabs = topLevelTabs
+        
+        setupFastAccountSwitcher()
+    }
+    
+    private func makeViewController(for tab: UITab) -> UIViewController {
+        guard let tab = Tab(rawValue: tab.identifier) else {
+            fatalError("unreachable")
+        }
+        let root: UIViewController
+        switch tab {
+        case .home:
+            root = TimelinesPageViewController(mastodonController: mastodonController)
+        case .notifications:
+            root = NotificationsPageViewController(mastodonController: mastodonController)
+        case .compose:
+            return composePlaceholder
+        case .explore:
+            root = ExploreViewController(mastodonController: mastodonController)
+        case .myProfile:
+            root = MyProfileViewController(mastodonController: mastodonController)
+        }
+        return EnhancedNavigationViewController(rootViewController: root)
+    }
+    
+    @objc func handleComposeKeyCommand() {
+        compose(editing: nil)
+    }
+    
+}
+
+@available(iOS 18.0, *)
+extension NewMainTabBarViewController {
+    enum Tab: String, Hashable, CaseIterable {
+        case home
+        case notifications
+        case compose
+        case explore
+        case myProfile
+        
+        var title: String {
+            switch self {
+            case .home:
+                "Home"
+            case .notifications:
+                "Notifications"
+            case .compose:
+                "Compose"
+            case .explore:
+                "Explore"
+            case .myProfile:
+                "My Profile"
+            }
+        }
+        
+        var imageName: String {
+            switch self {
+            case .home:
+                "house"
+            case .notifications:
+                "bell"
+            case .compose:
+                "pencil"
+            case .explore:
+                "magnifyingglass"
+            case .myProfile:
+                "person"
+            }
+        }
+    }
+}
+
+@available(iOS 18.0, *)
+extension NewMainTabBarViewController: UITabBarControllerDelegate {
+    func tabBarController(_ tabBarController: UITabBarController, shouldSelectTab tab: UITab) -> Bool {
+        if tab.identifier == Tab.compose.rawValue {
+            let currentTab = selectedTab
+            compose(editing: nil) {
+                // returning false for shouldSelectTab doesn't prevent the UITabBar from being updated (FB14857254)
+                // but we need it to change to _something_ so that we can change back to the current tab
+                self.selectedTab = tab
+                self.selectedTab = currentTab
+            }
+            return false
+        } else if let selectedTab,
+                  selectedTab == tab,
+                  let nav = selectedViewController as? any NavigationControllerProtocol,
+                  nav.viewControllers.count == 1,
+                  let scrollableVC = nav.viewControllers[0] as? TabBarScrollableViewController {
+            scrollableVC.tabBarScrollToTop()
+            return false
+        } else {
+            return true
+        }
+    }
+}
+
+@available(iOS 18.0, *)
+extension NewMainTabBarViewController: TuskerRootViewController {
+    func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?) {
+        func doSelect() {
+            switch route {
+            case .timelines:
+                selectedTab = tab(forIdentifier: Tab.home.rawValue)
+            case .notifications:
+                selectedTab = tab(forIdentifier: Tab.notifications.rawValue)
+            case .myProfile:
+                selectedTab = tab(forIdentifier: Tab.myProfile.rawValue)
+            case .explore:
+                selectedTab = tab(forIdentifier: Tab.explore.rawValue)
+            case .bookmarks:
+                selectedTab = tab(forIdentifier: Tab.explore.rawValue)
+                let nav = getNavigationController()
+                nav.popToRootViewController(animated: animated)
+                nav.pushViewController(BookmarksViewController(mastodonController: mastodonController), animated: animated)
+            case .list(let id):
+                selectedTab = tab(forIdentifier: Tab.explore.rawValue)
+                if let list = mastodonController.getCachedList(id: id) {
+                    let nav = getNavigationController()
+                    nav.popToRootViewController(animated: animated)
+                    nav.pushViewController(ListTimelineViewController(for: list, mastodonController: mastodonController), animated: animated)
+                }
+            }
+            completion?()
+        }
+        if presentedViewController != nil {
+            dismiss(animated: animated) {
+                doSelect()
+            }
+        } else {
+            doSelect()
+        }
+    }
+    
+    func getNavigationDelegate() -> (any TuskerNavigationDelegate)? {
+        return self
+    }
+    
+    func getNavigationController() -> any NavigationControllerProtocol {
+        return selectedViewController as! any NavigationControllerProtocol
+    }
+    
+    func performSearch(query: String) {
+        selectedTab = tab(forIdentifier: Tab.explore.rawValue)
+        guard let exploreNavController = selectedViewController as? any NavigationControllerProtocol,
+              let exploreController = exploreNavController.viewControllers.first as? ExploreViewController else {
+            return
+        }
+        
+        exploreNavController.popToRootViewController(animated: false)
+        
+        // setting searchController.isActive directly doesn't work until the view has loaded/appeared for the first time
+        if exploreController.isViewLoaded {
+            exploreController.searchController.isActive = true
+        } else {
+            exploreController.searchControllerStatusOnAppearance = true
+            // we still need to load the view so that we can setup the search query
+            exploreController.loadViewIfNeeded()
+        }
+        
+        exploreController.searchController.searchBar.text = query
+        exploreController.resultsController.performSearch(query: query)
+    }
+    
+    func presentPreferences(completion: (() -> Void)?) -> PreferencesNavigationController? {
+        let vc = PreferencesNavigationController(mastodonController: mastodonController)
+        present(vc, animated: true, completion: completion)
+        return vc
+    }
+}
+
+@available(iOS 18.0, *)
+extension NewMainTabBarViewController: AccountSwitchableViewController {
+    var isFastAccountSwitcherActive: Bool {
+        #if os(visionOS)
+        return false
+        #else
+        if let fastAccountSwitcher {
+            return !fastAccountSwitcher.view.isHidden
+        } else {
+            return false
+        }
+        #endif
+    }
+}

Tusker/Screens/Main/TuskerRootViewController.swift

@@ -11,9 +11,8 @@ import ComposeUI
 
 @MainActor
 protocol TuskerRootViewController: UIViewController, StateRestorableViewController, StatusBarTappableViewController {
-    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool)
+    func compose(editing draft: Draft?, animated: Bool, isDucked: Bool, completion: (() -> Void)?)
     func select(route: TuskerRoute, animated: Bool, completion: (() -> Void)?)
-    func getTabController(tab: MainTabBarViewController.Tab) -> UIViewController?
     func getNavigationDelegate() -> TuskerNavigationDelegate?
     func getNavigationController() -> NavigationControllerProtocol
     func performSearch(query: String)

Tusker/Shortcuts/AppShortcutItems.swift

@@ -48,7 +48,7 @@ enum AppShortcutItem: String, CaseIterable {
         case .showNotifications:
             root.select(route: .notifications, animated: false, completion: nil)
         case .composePost:
-            root.compose(editing: nil, animated: false, isDucked: false)
+            root.compose(editing: nil, animated: false, isDucked: false, completion: nil)
         }
     }
 }

Tusker/Shortcuts/UserActivityHandlingContext.swift

@@ -109,10 +109,10 @@ class StateRestorationUserActivityHandlingContext: UserActivityHandlingContext {
     func compose(editing draft: Draft) {
         if #available(iOS 16.0, *),
            UIDevice.current.userInterfaceIdiom == .phone {
-            self.root.compose(editing: draft, animated: false, isDucked: true)
+            self.root.compose(editing: draft, animated: false, isDucked: true, completion: nil)
         } else {
             DispatchQueue.main.async {
-                self.root.compose(editing: draft, animated: true, isDucked: false)
+                self.root.compose(editing: draft, animated: true, isDucked: false, completion: nil)
             }
         }
         state = .presented
@@ -123,7 +123,7 @@ class StateRestorationUserActivityHandlingContext: UserActivityHandlingContext {
         #if !os(visionOS)
         if #available(iOS 16.0, *),
            let duckedDraft = UserActivityManager.getDuckedDraft(from: activity) {
-            self.root.compose(editing: duckedDraft, animated: false, isDucked: true)
+            self.root.compose(editing: duckedDraft, animated: false, isDucked: true, completion: nil)
         }
         #endif
     }

Tusker/TuskerNavigationDelegate.swift

@@ -96,7 +96,7 @@ extension TuskerNavigationDelegate {
         show(ConversationViewController(for: statusID, state: state, mastodonController: apiController), sender: self)
     }
     
-    func compose(editing draft: Draft?, animated: Bool = true, isDucked: Bool = false) {
+    func compose(editing draft: Draft?, animated: Bool = true, isDucked: Bool = false, completion: (() -> Void)? = nil) {
         let draft = draft ?? apiController.createDraft()
         let visionIdiom = UIUserInterfaceIdiom(rawValue: 6) // .vision is not available pre-iOS 17 :S
         if [visionIdiom, .pad, .mac].contains(UIDevice.current.userInterfaceIdiom) {
@@ -108,16 +108,17 @@ extension TuskerNavigationDelegate {
             options.preferredPresentationStyle = .prominent
             #endif
             UIApplication.shared.requestSceneSessionActivation(nil, userActivity: compose, options: options, errorHandler: nil)
+            completion?()
         } else {
             let compose = ComposeHostingController(draft: draft, mastodonController: apiController)
             #if os(visionOS)
             fatalError("unreachable")
             #else
             if #available(iOS 16.0, *),
-               presentDuckable(compose, animated: animated, isDucked: isDucked) {
+               presentDuckable(compose, animated: animated, isDucked: isDucked, completion: completion) {
                 return
             } else {
-                present(compose, animated: animated)
+                present(compose, animated: animated, completion: completion)
             }
             #endif
         }