Size class switching fixes for new tab/side bar

Tusker.xcodeproj/project.pbxproj

@@ -132,6 +132,7 @@
 		D64A50462C739DC0009D7193 /* NewMainTabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50452C739DC0009D7193 /* NewMainTabBarViewController.swift */; };
 		D64A50482C739DEA009D7193 /* BaseMainTabBarViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50472C739DEA009D7193 /* BaseMainTabBarViewController.swift */; };
 		D64A50BC2C74F8F4009D7193 /* FindInstanceViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50BB2C74F8F4009D7193 /* FindInstanceViewController.swift */; };
+		D64A50BE2C752247009D7193 /* AdaptableNavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64A50BD2C752247009D7193 /* AdaptableNavigationController.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 */; };
@@ -563,6 +564,7 @@
 		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>"; };
 		D64A50BB2C74F8F4009D7193 /* FindInstanceViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FindInstanceViewController.swift; sourceTree = "<group>"; };
+		D64A50BD2C752247009D7193 /* AdaptableNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptableNavigationController.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>"; };
@@ -1556,6 +1558,7 @@
 				D6B8DB332182A59300424AF7 /* UIAlertController+Visibility.swift */,
 				D6C693FD2162FEEA007D6A6D /* UIViewController+Children.swift */,
 				D61F759129365C6C00C0B37F /* CollectionViewController.swift */,
+				D64A50BD2C752247009D7193 /* AdaptableNavigationController.swift */,
 			);
 			path = Utilities;
 			sourceTree = "<group>";
@@ -2341,6 +2344,7 @@
 				D6C693FE2162FEEA007D6A6D /* UIViewController+Children.swift in Sources */,
 				D61A45EA28DF51EE002BE511 /* TimelineLikeCollectionViewController.swift in Sources */,
 				D64D0AB12128D9AE005A6F37 /* OnboardingViewController.swift in Sources */,
+				D64A50BE2C752247009D7193 /* AdaptableNavigationController.swift in Sources */,
 				D6934F302BA7AF91002B1C8D /* ImageGalleryContentViewController.swift in Sources */,
 				D6934F3E2BAA19D5002B1C8D /* ImageActivityItemSource.swift in Sources */,
 				D67C1795266D57D10070F250 /* FastAccountSwitcherIndicatorView.swift in Sources */,

Tusker/Screens/Main/BaseMainTabBarViewController.swift

@@ -71,11 +71,12 @@ class BaseMainTabBarViewController: UITabBarController {
     
     private func repositionFastSwitcherIndicator() {
         guard let myProfileButton = findMyProfileTabBarButton(),
-              myProfileButton.window != nil else {
+              myProfileButton.window != nil,
+              let fastSwitcherIndicator else {
             fastSwitcherIndicator?.isHidden = true
             return
         }
-        fastSwitcherIndicator?.isHidden = false
+        fastSwitcherIndicator.isHidden = false
         NSLayoutConstraint.deactivate(fastSwitcherConstraints)
         let isPortrait = view.bounds.width < view.bounds.height
         if traitCollection.horizontalSizeClass == .compact && isPortrait {
@@ -156,7 +157,7 @@ extension BaseMainTabBarViewController: StateRestorableViewController {
            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 {
+        } else if let vc = (selectedViewController as? any NavigationControllerProtocol)?.topViewController as? StateRestorableViewController {
             activity = vc.stateRestorationActivity()
         }
         if activity == nil {

Tusker/Screens/Main/NewMainTabBarViewController.swift

@@ -15,11 +15,19 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
     
     private let composePlaceholder = UIViewController()
     
+    private var homeTab: UITab!
+    private var notificationsTab: UITab!
+    private var composeTab: UITab!
+    private var exploreTab: UITab!
+    private var bookmarksTab: UITab!
+    private var favoritesTab: UITab!
+    private var myProfileTab: UITab!
     private var listsGroup: UITabGroup!
     
     private var cancellables = Set<AnyCancellable>()
     
     private var navigationStacks = [String: [UIViewController]]()
+    private var isCompact: Bool?
 
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -34,19 +42,19 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
             self.makeViewController(for: tab)
         }
         
-        let homeTab = UITab(title: "Home", image: UIImage(systemName: "house"), identifier: Tab.home.rawValue, viewControllerProvider: viewControllerProvider)
+        homeTab = UITab(title: "Home", image: UIImage(systemName: "house"), identifier: Tab.home.rawValue, viewControllerProvider: viewControllerProvider)
-        let notificationsTab = UITab(title: "Notifications", image: UIImage(systemName: "bell"), identifier: Tab.notifications.rawValue, viewControllerProvider: viewControllerProvider)
+        notificationsTab = UITab(title: "Notifications", image: UIImage(systemName: "bell"), identifier: Tab.notifications.rawValue, viewControllerProvider: viewControllerProvider)
-        let composeTab = UITab(title: "Compose", image: UIImage(systemName: "pencil"), identifier: Tab.compose.rawValue, viewControllerProvider: viewControllerProvider)
+        composeTab = UITab(title: "Compose", image: UIImage(systemName: "pencil"), identifier: Tab.compose.rawValue, viewControllerProvider: viewControllerProvider)
-        let exploreTab = UITab(title: "Explore", image: UIImage(systemName: "magnifyingglass"), identifier: Tab.explore.rawValue, viewControllerProvider: viewControllerProvider)
+        exploreTab = UITab(title: "Explore", image: UIImage(systemName: "magnifyingglass"), identifier: Tab.explore.rawValue, viewControllerProvider: viewControllerProvider)
-        let bookmarksTab = UITab(title: "Bookmarks", image: UIImage(systemName: "bookmark"), identifier: Tab.bookmarks.rawValue, viewControllerProvider: viewControllerProvider)
+        bookmarksTab = UITab(title: "Bookmarks", image: UIImage(systemName: "bookmark"), identifier: Tab.bookmarks.rawValue, viewControllerProvider: viewControllerProvider)
         bookmarksTab.preferredPlacement = .optional
-        let favoritesTab = UITab(title: "Favorites", image: UIImage(systemName: "star"), identifier: Tab.favorites.rawValue, viewControllerProvider: viewControllerProvider)
+        favoritesTab = UITab(title: "Favorites", image: UIImage(systemName: "star"), identifier: Tab.favorites.rawValue, viewControllerProvider: viewControllerProvider)
         favoritesTab.preferredPlacement = .optional
-        let myProfileTab = UITab(title: "My Profile", image: UIImage(systemName: "person"), identifier: Tab.myProfile.rawValue, viewControllerProvider: viewControllerProvider)
+        myProfileTab = UITab(title: "My Profile", image: UIImage(systemName: "person"), identifier: Tab.myProfile.rawValue, viewControllerProvider: viewControllerProvider)
         
         listsGroup = UITabGroup(title: "Lists", image: nil, identifier: Tab.lists.rawValue, children: []) { _ in
             // this closure is necessary to prevent UIKit from crashing (FB14860961)
-            return MultiColumnNavigationController()
+            return AdaptableNavigationController()
         }
         listsGroup.preferredPlacement = .sidebarOnly
         listsGroup.sidebarActions = [
@@ -65,6 +73,72 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
                 myProfileTab,
             ]
         } else {
+            self.updatePadTabs()
+            registerForTraitChanges([UITraitHorizontalSizeClass.self]) { (self: NewMainTabBarViewController, previousTraitCollection) in
+                self.updatePadTabs()
+                
+                let vcToUpdate = self.selectedTab!.parent?.viewController ?? self.selectedTab!.viewController!
+                self.updateViewControllerSafeAreaInsets(vcToUpdate)
+            }
+        }
+        
+        setupFastAccountSwitcher()
+        
+        mastodonController.$lists
+            .sink { [unowned self] in self.reloadLists($0) }
+            .store(in: &cancellables)
+    }
+    
+    private func updatePadTabs() {
+        let wasCompact = isCompact
+        
+        if self.traitCollection.horizontalSizeClass == .compact {
+            isCompact = true
+            
+            var exploreNavStack: [UIViewController]? = nil
+            if selectedTab?.parent == listsGroup {
+                let nav = listsGroup.viewController as! any NavigationControllerProtocol
+                exploreNavStack = nav.viewControllers
+                nav.viewControllers = []
+            }
+            
+            self.tabs = [
+                homeTab,
+                notificationsTab,
+                composeTab,
+                exploreTab,
+                myProfileTab,
+            ]
+            
+            if let exploreNavStack {
+                selectedTab = exploreTab
+                let nav = exploreTab.viewController as! any NavigationControllerProtocol
+                nav.viewControllers = exploreNavStack
+            }
+        } else {
+            isCompact = false
+            
+            var newTab: (UITab, [UIViewController])? = nil
+            if wasCompact == true,
+               selectedTab == exploreTab {
+                let nav = exploreTab.viewController as! any NavigationControllerProtocol
+                // skip over the ExploreViewController
+                if nav.viewControllers.count > 1 {
+                    switch nav.viewControllers[1] {
+                    case let listVC as ListTimelineViewController:
+                        if let tab = listsGroup.tab(forIdentifier: "list:\(listVC.list.id)") {
+                            newTab = (tab, Array(nav.viewControllers[1...]))
+                            nav.viewControllers = [
+                                nav.viewControllers[0], // leave the ExploreVC in place
+                                InlineTrendsViewController(mastodonController: mastodonController), // re-insert an InlineTrendsVC
+                            ]
+                        }
+                    default:
+                        break
+                    }
+                }
+            }
+            
             self.tabs = [
                 homeTab,
                 notificationsTab,
@@ -75,13 +149,17 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
                 composeTab,
                 listsGroup,
             ]
+            
+            if let (tab, navStack) = newTab {
+                let nav = tab.parent!.viewController as! any NavigationControllerProtocol
+                nav.viewControllers = navStack
+                // Setting the tab now seems to be clobbered by the UITabBarController itself updating in response
+                // to the size class change. So wait until it finishes to do so.
+                DispatchQueue.main.async {
+                    self.selectedTab = tab
+                }
+            }
         }
-        
-        setupFastAccountSwitcher()
-        
-        mastodonController.$lists
-            .sink { [unowned self] in self.reloadLists($0) }
-            .store(in: &cancellables)
     }
     
     private func makeViewController(for tab: UITab) -> UIViewController {
@@ -100,7 +178,11 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
             if UIDevice.current.userInterfaceIdiom == .phone {
                 root = ExploreViewController(mastodonController: mastodonController)
             } else {
-                root = InlineTrendsViewController(mastodonController: mastodonController)
+                let nav = AdaptableNavigationController(viewControllersToPrependInCompact: [
+                    ExploreViewController(mastodonController: mastodonController)
+                ])
+                nav.viewControllers = [InlineTrendsViewController(mastodonController: mastodonController)]
+                return nav
             }
         case .bookmarks:
             root = BookmarksViewController(mastodonController: mastodonController)
@@ -111,24 +193,11 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
         case .lists:
             fatalError("unreachable")
         }
-        return NewMainTabBarViewController.embedInNavigationController(root)
+        return embedInNavigationController(root)
     }
     
-    private static func embedInNavigationController(_ vc: UIViewController) -> UIViewController {
+    private func embedInNavigationController(_ vc: UIViewController) -> UIViewController {
-        let nav: any NavigationControllerProtocol
+        let nav = AdaptableNavigationController()
-        if UIDevice.current.userInterfaceIdiom == .phone {
-            nav = EnhancedNavigationViewController()
-        } else {
-            // TODO: need to figure out how to update the navigation controller if the pref changes
-            switch Preferences.shared.widescreenNavigationMode {
-            case .stack:
-                nav = EnhancedNavigationViewController()
-            case .splitScreen:
-                nav = SplitNavigationController()
-            case .multiColumn:
-                nav = MultiColumnNavigationController()
-            }
-        }
         nav.viewControllers = [vc]
         return nav
     }
@@ -136,7 +205,7 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
     private func reloadLists(_ lists: [List]) {
         listsGroup.children = lists.map { list in
             UITab(title: list.title, image: UIImage(systemName: "list.bullet"), identifier: "list:\(list.id)") { [unowned self] _ in
-                NewMainTabBarViewController.embedInNavigationController(ListTimelineViewController(for: list, mastodonController: self.mastodonController))
+                return ListTimelineViewController(for: list, mastodonController: self.mastodonController)
             }
         }
     }
@@ -145,7 +214,10 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
         compose(editing: nil)
     }
     
-    fileprivate func updateViewControllerSafeAreaInsets(_ vc: MultiColumnNavigationController) {
+    fileprivate func updateViewControllerSafeAreaInsets(_ vc: UIViewController) {
+        guard vc is MultiColumnNavigationController || (vc as? AdaptableNavigationController)?.current is MultiColumnNavigationController else {
+            return
+        }
         // When in sidebar mode, for multi column mode, don't leave an inset for the floating tab bar, because it leaves a massive gap.
         // The floating tab bar seems to always be 88pt tall, regardless of, e.g., Dynamic Type size.
         vc.additionalSafeAreaInsets = UIEdgeInsets(top: sidebar.isHidden ? 0 : -88, left: 0, bottom: 0, right: 0)
@@ -192,9 +264,7 @@ extension NewMainTabBarViewController: UITabBarControllerDelegate {
     }
     
     func tabBarController(_ tabBarController: UITabBarController, didSelectTab newTab: UITab, previousTab: UITab?) {
-        if let vc = newTab.viewController as? MultiColumnNavigationController {
+        self.updateViewControllerSafeAreaInsets(newTab.viewController!)
-            self.updateViewControllerSafeAreaInsets(vc)
-        }
 
         // All tabs in a tab group deliberately share the same view controller, so we have to do this ourselves.
         // I think this is pretty unfortunate API design--half the time, the tab bar controller takes care of
@@ -207,9 +277,7 @@ extension NewMainTabBarViewController: UITabBarControllerDelegate {
         if let group = newTab.parent,
            group.identifier == Tab.lists.rawValue,
            let nav = group.viewController as? any NavigationControllerProtocol {
-            if let multiColumn = nav as? MultiColumnNavigationController {
+            updateViewControllerSafeAreaInsets(nav)
-                updateViewControllerSafeAreaInsets(multiColumn)
-            }
             
             if let previousTab {
                 navigationStacks[previousTab.identifier] = nav.viewControllers
@@ -217,8 +285,8 @@ extension NewMainTabBarViewController: UITabBarControllerDelegate {
             
             if let existing = navigationStacks[newTab.identifier] {
                 nav.viewControllers = existing
-            } else if let newNav = newTab.viewController as? any NavigationControllerProtocol {
+            } else if let newVC = newTab.viewController {
-                nav.viewControllers = newNav.viewControllers
+                nav.viewControllers = [newVC]
             } else {
                 fatalError("unreachable")
             }
@@ -229,11 +297,10 @@ extension NewMainTabBarViewController: UITabBarControllerDelegate {
 @available(iOS 18.0, *)
 extension NewMainTabBarViewController: UITabBarController.Sidebar.Delegate {
     func tabBarController(_ tabBarController: UITabBarController, sidebarVisibilityWillChange sidebar: UITabBarController.Sidebar, animator: any UITabBarController.Sidebar.Animating) {
-        if let vc = selectedViewController as? MultiColumnNavigationController {
+        let vc = selectedTab!.parent?.viewController ?? selectedTab!.viewController!
-            animator.addAnimations {
+        animator.addAnimations {
-                self.updateViewControllerSafeAreaInsets(vc)
+            self.updateViewControllerSafeAreaInsets(vc)
-                vc.view.layoutIfNeeded()
+            vc.view.layoutIfNeeded()
-            }
         }
     }
 }

Tusker/Screens/Utilities/AdaptableNavigationController.swift

@@ -0,0 +1,136 @@
+//
+//  AdaptableNavigationController.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 8/20/24.
+//  Copyright © 2024 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import Combine
+
+@available(iOS 17.0, *)
+class AdaptableNavigationController: UIViewController {
+    
+    private let viewControllersToPrependInCompact: [UIViewController]
+    
+    private var initialViewControllers: [UIViewController] = []
+    private lazy var regular = makeRegularNavigationController()
+    private lazy var compact = makeCompactNavigationController()
+    private var _current: (any NavigationControllerProtocol)?
+    var current: any NavigationControllerProtocol {
+        traitCollection.horizontalSizeClass == .regular ? regular : compact
+    }
+    
+    init(viewControllersToPrependInCompact: [UIViewController] = []) {
+        self.viewControllersToPrependInCompact = viewControllersToPrependInCompact
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        updateNavigationController()
+        registerForTraitChanges([UITraitHorizontalSizeClass.self]) { (self: AdaptableNavigationController, previousTraitCollection) in
+            self.updateNavigationController()
+        }
+    }
+    
+    private func updateNavigationController() {
+        let isTransferring: Bool
+        var stack: [UIViewController]
+        if let _current {
+            _current.removeViewAndController()
+            stack = _current.viewControllers
+            isTransferring = true
+        } else {
+            stack = initialViewControllers
+            initialViewControllers = []
+            isTransferring = false
+        }
+        
+        if traitCollection.horizontalSizeClass == .regular {
+            if isTransferring {
+                stack.removeFirst(viewControllersToPrependInCompact.count)
+            }
+        } else {
+            stack.insert(contentsOf: viewControllersToPrependInCompact, at: 0)
+        }
+        
+        _current = current
+        current.viewControllers = stack
+        
+        addChild(current)
+        current.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(current.view)
+        NSLayoutConstraint.activate([
+            current.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            current.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            current.view.topAnchor.constraint(equalTo: view.topAnchor),
+            current.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        current.didMove(toParent: self)
+    }
+    
+    private func makeRegularNavigationController() -> any NavigationControllerProtocol {
+        // TODO: need to figure out how to update the navigation controller if the pref changes
+        switch Preferences.shared.widescreenNavigationMode {
+        case .stack:
+            return EnhancedNavigationViewController()
+        case .splitScreen:
+            return SplitNavigationController()
+        case .multiColumn:
+            return MultiColumnNavigationController()
+        }
+    }
+    
+    private func makeCompactNavigationController() -> any NavigationControllerProtocol {
+        EnhancedNavigationViewController()
+    }
+}
+
+@available(iOS 17.0, *)
+extension AdaptableNavigationController: NavigationControllerProtocol {
+    var viewControllers: [UIViewController] {
+        get {
+            _current?.viewControllers ?? initialViewControllers
+        }
+        set {
+            if let _current {
+                _current.viewControllers = newValue
+            } else {
+                initialViewControllers = newValue
+            }
+        }
+    }
+    
+    var topViewController: UIViewController? {
+        if let _current {
+            return _current.topViewController
+        } else {
+            return initialViewControllers.last
+        }
+    }
+    
+    func popToRootViewController(animated: Bool) -> [UIViewController]? {
+        if let _current {
+            return _current.popToRootViewController(animated: animated)
+        } else {
+            defer { initialViewControllers = [] }
+            return initialViewControllers
+        }
+    }
+    
+    func pushViewController(_ vc: UIViewController, animated: Bool) {
+        if let _current {
+            _current.pushViewController(vc, animated: animated)
+        } else {
+            initialViewControllers.append(vc)
+        }
+    }
+}