Replace UINavigationController with custom navigation controller

BrowserCore/NavigationManager.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import  Combine
 
 public protocol NavigationManagerDelegate: class {
     func loadNonGeminiURL(_ url: URL)
@@ -19,6 +20,8 @@ public class NavigationManager: NSObject, ObservableObject {
     @Published public var backStack = [URL]()
     @Published public var forwardStack = [URL]()
     
+    public let navigationOperation = PassthroughSubject<Operation, Never>()
+    
     public var displayURL: String {
         var components = URLComponents(url: currentURL, resolvingAgainstBaseURL: false)!
         if components.port == 1965 {
@@ -58,6 +61,8 @@ public class NavigationManager: NSObject, ObservableObject {
         backStack.append(currentURL)
         currentURL = url
         forwardStack = []
+        
+        navigationOperation.send(.go)
     }
     
     public func reload() {
@@ -66,9 +71,7 @@ public class NavigationManager: NSObject, ObservableObject {
     }
     
     @objc public func back() {
-        guard !backStack.isEmpty else { return }
+        back(count: 1)
-        forwardStack.insert(currentURL, at: 0)
-        currentURL = backStack.removeLast()
     }
     
     public func back(count: Int) {
@@ -78,12 +81,12 @@ public class NavigationManager: NSObject, ObservableObject {
         forwardStack.insert(currentURL, at: 0)
         currentURL = removed.removeFirst()
         forwardStack.insert(contentsOf: removed, at: 0)
+        
+        navigationOperation.send(.backward(count: count))
     }
     
     @objc public func forward() {
-        guard !forwardStack.isEmpty else { return }
+        forward(count: 1)
-        backStack.append(currentURL)
-        currentURL = forwardStack.removeFirst()
     }
     
     public func forward(count: Int) {
@@ -93,6 +96,14 @@ public class NavigationManager: NSObject, ObservableObject {
         backStack.append(currentURL)
         currentURL = removed.removeLast()
         backStack.append(contentsOf: removed)
+        
+        navigationOperation.send(.forward(count: count))
     }
     
 }
+
+public extension NavigationManager {
+    enum Operation {
+        case go, forward(count: Int), backward(count: Int)
+    }
+}

Gemini-iOS/BrowserNavigationController.swift

@@ -2,21 +2,22 @@
 //  BrowserNavigationController.swift
 //  Gemini-iOS
 //
-//  Created by Shadowfacts on 12/16/20.
+//  Created by Shadowfacts on 12/17/20.
 //
 
 import UIKit
 import BrowserCore
 import Combine
 
-class BrowserNavigationController: UINavigationController {
+class BrowserNavigationController: UIViewController {
 
     let navigator: NavigationManager
     
-    var poppedViewControllers = [UIViewController]()
+    private var backBrowserVCs = [BrowserWebViewController]()
-    var skipResetPoppedOnNextPush = false
+    private var forwardBrowserVCs = [BrowserWebViewController]()
+    private var currentBrowserVC: BrowserWebViewController!
     
-    private var interactivePushTransition: InteractivePushTransition!
+    private var gestureState: GestureState?
     
     private var cancellables = [AnyCancellable]()
     
@@ -24,74 +25,169 @@ class BrowserNavigationController: UINavigationController {
         self.navigator = navigator
         
         super.init(nibName: nil, bundle: nil)
-        
-        navigator.$currentURL
-            .sink { [weak self] (newURL) in
-                self?.pushViewController(BrowserWebViewController(navigator: navigator, url: newURL), animated: true)
-            }
-            .store(in: &cancellables)
     }
     
-    required init?(coder aDecoder: NSCoder) {
+    required init?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
     
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        interactivePushTransition = InteractivePushTransition(navigationController: self)
+        view.backgroundColor = .systemBackground
+        
+        currentBrowserVC = BrowserWebViewController(navigator: navigator, url: navigator.currentURL)
+        embedChild(currentBrowserVC)
+        
+        navigator.navigationOperation
+            .sink(receiveValue: self.onNavigate)
+            .store(in: &cancellables)
+        
+        view.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized)))
     }
     
-    override func popViewController(animated: Bool) -> UIViewController? {
+    private func onNavigate(_ operation: NavigationManager.Operation) {
-        if let popped = super.popViewController(animated: animated) {
+        let newVC: BrowserWebViewController
-            poppedViewControllers.insert(popped, at: 0)
+        
-            return popped
+        switch operation {
-        } else {
+        case .go:
-            return nil
+            backBrowserVCs.append(currentBrowserVC)
+            newVC = BrowserWebViewController(navigator: navigator, url: navigator.currentURL)
+            
+        case let .backward(count: count):
+            var removed = backBrowserVCs.suffix(count)
+            backBrowserVCs.removeLast(count)
+            forwardBrowserVCs.insert(currentBrowserVC, at: 0)
+            newVC = removed.removeFirst()
+            forwardBrowserVCs.insert(contentsOf: removed, at: 0)
+            
+        case let .forward(count: count):
+            var removed = forwardBrowserVCs.prefix(count)
+            forwardBrowserVCs.removeFirst(count)
+            backBrowserVCs.append(currentBrowserVC)
+            newVC = removed.removeFirst()
+            backBrowserVCs.append(contentsOf: removed)
         }
+        
+        currentBrowserVC.removeViewAndController()
+        currentBrowserVC = newVC
+        embedChild(newVC)
     }
     
-    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
+    private let startEdgeNavigationSwipeDistance: CGFloat = 75
-        if let popped = super.popToRootViewController(animated: animated) {
+    private let finishEdgeNavigationVelocityThreshold: CGFloat = 500
-            poppedViewControllers = popped
+    private let edgeNavigationMaxDimmingAlpha: CGFloat = 0.35
-            return popped
+    private let edgeNavigationParallaxFactor: CGFloat = 0.25
-        } else {
+    private let totalEdgeNavigationTime: TimeInterval = 0.4
-            return nil
-        }
-    }
     
-    override func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? {
+    @objc private func panGestureRecognized(_ recognizer: UIPanGestureRecognizer) {
-        if let popped = super.popToViewController(viewController, animated: animated) {
+        let location = recognizer.location(in: view)
-            poppedViewControllers.insert(contentsOf: popped, at: 0)
+        let velocity = recognizer.velocity(in: view)
-            return popped
+        
-        } else {
+        switch recognizer.state {
-            return nil
+        case .began:
-        }
+            if location.x < startEdgeNavigationSwipeDistance && velocity.x > 0 && navigator.backStack.count > 0 {
-    }
+                let older = backBrowserVCs.last ?? BrowserWebViewController(navigator: navigator, url: navigator.backStack.last!)
-    
+                embedChild(older)
-    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
+                older.view.layer.zPosition = -2
-        if skipResetPoppedOnNextPush {
+                older.view.transform = CGAffineTransform(translationX: -1 * edgeNavigationParallaxFactor * view.bounds.width, y: 0)
-            skipResetPoppedOnNextPush = false
+                
-        } else {
+                let dimmingView = UIView()
-            self.poppedViewControllers = []
+                dimmingView.translatesAutoresizingMaskIntoConstraints = false
-        }
+                dimmingView.backgroundColor = .black
-        super.pushViewController(viewController, animated: animated)
+                dimmingView.layer.zPosition = -1
-    }
+                dimmingView.alpha = edgeNavigationMaxDimmingAlpha
-    
+                view.embedSubview(dimmingView)
-    func onWillShow() {
+                let animator = UIViewPropertyAnimator(duration: totalEdgeNavigationTime, curve: .easeInOut) {
-        self.transitionCoordinator?.notifyWhenInteractionChanges({ (context) in
+                    dimmingView.alpha = 0
-            if context.isCancelled {
+                    older.view.transform = .identity
-                if self.interactivePushTransition.interactive {
+                    self.currentBrowserVC.view.transform = CGAffineTransform(translationX: self.view.bounds.width, y: 0)
-                    // when an interactive push gesture is cancelled, make sure to adding the VC that was being pushed back onto the popped stack so it doesn't disappear
-                    self.poppedViewControllers.insert(self.interactivePushTransition.pushingViewController!, at: 0)
-                } else {
-                    // when an interactive pop gesture is cancelled (i.e. the user lifts their finger before it triggers),
-                    // the popViewController(animated:) method has already been called so the VC has already been added to the popped stack
-                    // so we make sure to remove it, otherwise there could be duplicate VCs on the navigation stasck
-                    self.poppedViewControllers.remove(at: 0)
                 }
+                animator.addCompletion { (position) in
+                    dimmingView.removeFromSuperview()
+                    
+                    older.view.transform = .identity
+                    older.view.layer.zPosition = 0
+                    older.removeViewAndController()
+                    
+                    self.currentBrowserVC.view.transform = .identity
+                    
+                    if position == .end {
+                        self.navigator.back()
+                    }
+                }
+                gestureState = .backwards(animator)
+            } else if location.x > view.bounds.width - startEdgeNavigationSwipeDistance && velocity.x < 0 && navigator.forwardStack.count > 0 {
+                let newer = forwardBrowserVCs.first ?? BrowserWebViewController(navigator: navigator, url: navigator.backStack.first!)
+                embedChild(newer)
+                newer.view.transform = CGAffineTransform(translationX: view.bounds.width, y: 0)
+                newer.view.layer.zPosition = 2
+                
+                let dimmingView = UIView()
+                dimmingView.translatesAutoresizingMaskIntoConstraints = false
+                dimmingView.backgroundColor = .black
+                dimmingView.layer.zPosition = 1
+                dimmingView.alpha = 0
+                view.embedSubview(dimmingView)
+                let animator = UIViewPropertyAnimator(duration: totalEdgeNavigationTime, curve: .easeInOut) {
+                    dimmingView.alpha = self.edgeNavigationMaxDimmingAlpha
+                    newer.view.transform = .identity
+                    self.currentBrowserVC.view.transform = CGAffineTransform(translationX: -1 * self.edgeNavigationParallaxFactor * self.view.bounds.width, y: 0)
+                }
+                animator.addCompletion { (position) in
+                    dimmingView.removeFromSuperview()
+                    
+                    newer.removeViewAndController()
+                    newer.view.layer.zPosition = 0
+                    newer.view.transform = .identity
+                    
+                    self.currentBrowserVC.view.transform = .identity
+                    
+                    if position == .end {
+                        self.navigator.forward()
+                    }
+                }
+                gestureState = .forwards(animator)
             }
-        })
+        
+        case .changed:
+            let translation = recognizer.translation(in: view)
+            
+            switch gestureState {
+            case let .backwards(animator):
+                animator.fractionComplete = translation.x / view.bounds.width
+            case let .forwards(animator):
+                animator.fractionComplete = abs(translation.x) / view.bounds.width
+            case nil:
+                break
+            }
+            
+        case .ended, .cancelled:
+            switch gestureState {
+            case let .backwards(animator):
+                let shouldComplete = location.x > view.bounds.width / 2 || velocity.x > finishEdgeNavigationVelocityThreshold
+                animator.isReversed = !shouldComplete
+                animator.startAnimation()
+            case let .forwards(animator):
+                let shouldComplete = location.x < view.bounds.width / 2 || velocity.x < -finishEdgeNavigationVelocityThreshold
+                animator.isReversed = !shouldComplete
+                animator.startAnimation()
+            case nil:
+                break
+            }
+            
+            gestureState = nil
+            
+        default:
+            return
+        }
+    }
+
+}
+
+extension BrowserNavigationController {
+    enum GestureState {
+        case backwards(UIViewPropertyAnimator)
+        case forwards(UIViewPropertyAnimator)
     }
-    
 }

Gemini-iOS/BrowserWebViewController.swift

@@ -63,6 +63,8 @@ class BrowserWebViewController: UIViewController {
         view.backgroundColor = .systemBackground        
         
         webView = WKWebView()
+        webView.backgroundColor = .systemBackground
+        webView.isOpaque = false
         webView.navigationDelegate = self
         webView.translatesAutoresizingMaskIntoConstraints = false
         view.addSubview(webView)

Gemini-iOS/InteractivePushTransition.swift

@@ -1,142 +0,0 @@
-//
-//  InteractivePushTransition.swift
-//  Gemini-iOS
-//
-//  Created by Shadowfacts on 12/16/20.
-//
-
-import UIKit
-
-/// Allows interactively moving forward through the navigation stack after popping
-/// Based on https://github.com/NSExceptional/TBInteractivePushTransition
-class InteractivePushTransition: UIPercentDrivenInteractiveTransition {
-    
-    fileprivate let minimumPushVelocityThreshold: CGFloat = 700
-    fileprivate let minimumPushDistanceThreshold: CGFloat = 0.5
-    fileprivate let pushAnimationDuration: TimeInterval = 0.35
-    
-    private(set) weak var navigationController: BrowserNavigationController!
-
-    private(set) weak var interactivePushGestureRecognizer: UIScreenEdgePanGestureRecognizer!
-    
-    private(set) var interactive = false
-    private(set) weak var pushingViewController: UIViewController?
-    
-    init(navigationController: BrowserNavigationController) {
-        super.init()
-        
-        self.navigationController = navigationController
-
-        let interactivePushGestureRecognizer = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(handleSwipeForward(_:)))
-        self.interactivePushGestureRecognizer = interactivePushGestureRecognizer
-        
-        navigationController.delegate = self
-        interactivePushGestureRecognizer.edges = .right
-        interactivePushGestureRecognizer.require(toFail: navigationController.interactivePopGestureRecognizer!)
-        navigationController.view.addGestureRecognizer(interactivePushGestureRecognizer)
-        
-        let trackpadGestureRecognizer = TrackpadScrollGestureRecognizer(target: self, action: #selector(handleSwipeForward(_:)))
-        trackpadGestureRecognizer.require(toFail: navigationController.interactivePopGestureRecognizer!)
-        navigationController.view.addGestureRecognizer(trackpadGestureRecognizer)
-    }
-
-    @objc func handleSwipeForward(_ recognizer: UIPanGestureRecognizer) {
-        interactive = true
-        
-        let velocity = recognizer.velocity(in: recognizer.view)
-        let translation = recognizer.translation(in: recognizer.view)
-        let dx = -translation.x / navigationController.view.bounds.width
-        let vx = -velocity.x
-        
-        switch recognizer.state {
-        case .began:
-            if let viewController = navigationController.poppedViewControllers.first {
-                pushingViewController = viewController
-                navigationController.poppedViewControllers.removeFirst()
-                navigationController.skipResetPoppedOnNextPush = true
-                navigationController.pushViewController(viewController, animated: true)
-            } else {
-                interactive = false
-            }
-            
-        case .changed:
-            update(dx)
-
-        case .ended:
-            if (dx > minimumPushDistanceThreshold || vx > minimumPushVelocityThreshold) {
-                finish()
-            } else {
-                cancel()
-            }
-            interactive = false
-            
-        default:
-            cancel()
-            interactive = false
-        }
-    }
-
-}
-
-extension InteractivePushTransition: UINavigationControllerDelegate {
-    func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
-        self.navigationController.onWillShow()
-    }
-    
-    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
-        if operation == .push, interactive {
-            return self
-        }
-        
-        return nil
-    }
-    
-    func navigationController(_ navigationController: UINavigationController, interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
-        if interactive {
-            return self
-        }
-        return nil
-    }
-}
-
-extension InteractivePushTransition: UIViewControllerAnimatedTransitioning {
-    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
-        return pushAnimationDuration
-    }
-    
-    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
-        let toView = transitionContext.view(forKey: .to)!
-        let fromView = transitionContext.view(forKey: .from)!
-
-        let dimmingView = UIView()
-        dimmingView.backgroundColor = .black
-        dimmingView.alpha = 0
-        dimmingView.frame = fromView.frame
-
-        transitionContext.containerView.addSubview(dimmingView)
-        transitionContext.containerView.addSubview(toView)
-        
-        // modify frame of presented view to go from x = <screen width> to x = 0
-        var frame = fromView.frame
-        frame.origin.x = frame.width
-        toView.frame = frame
-        frame.origin.x = 0
-        
-        // we want it linear while interactive, but we want the "ease out" animation
-        // if the user flicks the screen ahrd enough to finish the transition without interaction
-        let options = interactive ? UIView.AnimationOptions.curveLinear : .curveEaseOut
-        
-        let duration = transitionDuration(using: transitionContext)
-        UIView.animate(withDuration: duration, delay: 0, options: options, animations: {
-            // these magic numbers scientifically determined by repeatedly adjusting and comparing to the system animation
-            let translationDistance = -frame.size.width * 0.3
-            fromView.transform = CGAffineTransform(translationX: translationDistance, y: 0)
-            toView.frame = frame
-            dimmingView.alpha = 0.075
-        }) { (finished) in
-            fromView.transform = .identity
-            dimmingView.removeFromSuperview()
-            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
-        }
-    }
-}

Gemini-iOS/UIViewController+Children.swift

@@ -0,0 +1,86 @@
+//
+//  UIViewController+Children.swift
+//  Gemini-iOS
+//
+//  Created by Shadowfacts on 12/17/20.
+//
+
+import UIKit
+
+// Based on MVCTodo by Dave DeLong: https://github.com/davedelong/MVCTodo/blob/841649dd6aa31bacda3ad7ef9a9a836f66281e50/MVCTodo/Extensions/UIViewController.swift
+extension UIViewController {
+    func embedChild(_ newChild: UIViewController, in container: UIView? = nil) {
+        // if the view controller is already a child of something else, remove it
+        if let oldParent = newChild.parent, oldParent != self {
+            newChild.beginAppearanceTransition(false, animated: false)
+            newChild.willMove(toParent: nil)
+            newChild.removeFromParent()
+            
+            if newChild.viewIfLoaded?.superview != nil {
+                newChild.viewIfLoaded?.removeFromSuperview()
+            }
+            
+            newChild.endAppearanceTransition()
+        }
+        
+        // since .view returns an IUO, by default the type of this is "UIView?"
+        // explicitly type the variable because We Know Better™
+        var targetContainer: UIView = container ?? self.view
+        if !targetContainer.isContainedWithin(view) {
+            targetContainer = view
+        }
+        
+        // add the view controller as a child
+        if newChild.parent != self {
+            newChild.beginAppearanceTransition(true, animated: false)
+            addChild(newChild)
+            newChild.didMove(toParent: self)
+            targetContainer.embedSubview(newChild.view)
+            newChild.endAppearanceTransition()
+        } else {
+            // the view controller is already a child
+            // make sure it's in the right view
+            
+            // we don't do the appearance transition stuff here,
+            // because the vc is already a child, so *presumably*
+            // that transition stuff has already appened
+            targetContainer.embedSubview(newChild.view)
+        }
+    }
+    
+    func removeViewAndController() {
+        view.removeFromSuperview()
+        removeFromParent()
+    }
+}
+
+// Based on MVCTodo by Dave DeLong: https://github.com/davedelong/MVCTodo/blob/841649dd6aa31bacda3ad7ef9a9a836f66281e50/MVCTodo/Extensions/UIView.swift
+extension UIView {
+    func embedSubview(_ subview: UIView) {
+        if subview.superview == self { return }
+        
+        if subview.superview != nil {
+            subview.removeFromSuperview()
+        }
+        
+        subview.frame = bounds
+        addSubview(subview)
+        
+        NSLayoutConstraint.activate([
+            subview.leadingAnchor.constraint(equalTo: leadingAnchor),
+            subview.trailingAnchor.constraint(equalTo: trailingAnchor),
+            subview.topAnchor.constraint(equalTo: topAnchor),
+            subview.bottomAnchor.constraint(equalTo: bottomAnchor)
+        ])
+    }
+    
+    func isContainedWithin(_ other: UIView) -> Bool {
+        var current: UIView? = self
+        while let proposedView = current {
+            if proposedView == other { return true }
+            current = proposedView.superview
+        }
+        return false
+    }
+}
+

Gemini.xcodeproj/project.pbxproj

@@ -44,10 +44,10 @@
 		D688F590258AC814003A0A73 /* HTMLEntities in Frameworks */ = {isa = PBXBuildFile; productRef = D688F58F258AC814003A0A73 /* HTMLEntities */; };
 		D688F599258ACAAE003A0A73 /* BrowserWebViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F598258ACAAE003A0A73 /* BrowserWebViewController.swift */; };
 		D688F5FF258ACE6B003A0A73 /* browser.css in Resources */ = {isa = PBXBuildFile; fileRef = D688F5FE258ACE6B003A0A73 /* browser.css */; };
-		D688F621258B0811003A0A73 /* BrowserNavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F620258B0811003A0A73 /* BrowserNavigationController.swift */; };
-		D688F62A258B0833003A0A73 /* InteractivePushTransition.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F629258B0833003A0A73 /* InteractivePushTransition.swift */; };
 		D688F633258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F632258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift */; };
 		D688F64A258C17F3003A0A73 /* SymbolCache.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F649258C17F3003A0A73 /* SymbolCache.swift */; };
+		D688F65A258C2256003A0A73 /* BrowserNavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F659258C2256003A0A73 /* BrowserNavigationController.swift */; };
+		D688F663258C2479003A0A73 /* UIViewController+Children.swift in Sources */ = {isa = PBXBuildFile; fileRef = D688F662258C2479003A0A73 /* UIViewController+Children.swift */; };
 		D691A64E25217C6F00348C4B /* Preferences.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691A64D25217C6F00348C4B /* Preferences.swift */; };
 		D691A66725217FD800348C4B /* PreferencesView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691A66625217FD800348C4B /* PreferencesView.swift */; };
 		D691A68725223A4700348C4B /* NavigationBar.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691A68625223A4600348C4B /* NavigationBar.swift */; };
@@ -309,10 +309,10 @@
 		D688F585258AC738003A0A73 /* GeminiHTMLRenderer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeminiHTMLRenderer.swift; sourceTree = "<group>"; };
 		D688F598258ACAAE003A0A73 /* BrowserWebViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowserWebViewController.swift; sourceTree = "<group>"; };
 		D688F5FE258ACE6B003A0A73 /* browser.css */ = {isa = PBXFileReference; lastKnownFileType = text.css; path = browser.css; sourceTree = "<group>"; };
-		D688F620258B0811003A0A73 /* BrowserNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowserNavigationController.swift; sourceTree = "<group>"; };
-		D688F629258B0833003A0A73 /* InteractivePushTransition.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InteractivePushTransition.swift; sourceTree = "<group>"; };
 		D688F632258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrackpadScrollGestureRecognizer.swift; sourceTree = "<group>"; };
 		D688F649258C17F3003A0A73 /* SymbolCache.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SymbolCache.swift; sourceTree = "<group>"; };
+		D688F659258C2256003A0A73 /* BrowserNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowserNavigationController.swift; sourceTree = "<group>"; };
+		D688F662258C2479003A0A73 /* UIViewController+Children.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIViewController+Children.swift"; sourceTree = "<group>"; };
 		D691A64D25217C6F00348C4B /* Preferences.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Preferences.swift; sourceTree = "<group>"; };
 		D691A66625217FD800348C4B /* PreferencesView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreferencesView.swift; sourceTree = "<group>"; };
 		D691A6762522382E00348C4B /* BrowserViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowserViewController.swift; sourceTree = "<group>"; };
@@ -581,10 +581,10 @@
 				D6E152A424BFFDF500FDF9D3 /* AppDelegate.swift */,
 				D6E152A624BFFDF500FDF9D3 /* SceneDelegate.swift */,
 				D688F649258C17F3003A0A73 /* SymbolCache.swift */,
-				D688F620258B0811003A0A73 /* BrowserNavigationController.swift */,
+				D688F659258C2256003A0A73 /* BrowserNavigationController.swift */,
-				D688F629258B0833003A0A73 /* InteractivePushTransition.swift */,
-				D688F632258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift */,
 				D688F598258ACAAE003A0A73 /* BrowserWebViewController.swift */,
+				D688F632258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift */,
+				D688F662258C2479003A0A73 /* UIViewController+Children.swift */,
 				D691A6762522382E00348C4B /* BrowserViewController.swift */,
 				D6E152A824BFFDF500FDF9D3 /* ContentView.swift */,
 				D691A68625223A4600348C4B /* NavigationBar.swift */,
@@ -1103,9 +1103,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				D688F621258B0811003A0A73 /* BrowserNavigationController.swift in Sources */,
 				D691A66725217FD800348C4B /* PreferencesView.swift in Sources */,
-				D688F62A258B0833003A0A73 /* InteractivePushTransition.swift in Sources */,
 				D688F599258ACAAE003A0A73 /* BrowserWebViewController.swift in Sources */,
 				D688F633258B09BB003A0A73 /* TrackpadScrollGestureRecognizer.swift in Sources */,
 				D6E152A524BFFDF500FDF9D3 /* AppDelegate.swift in Sources */,
@@ -1113,7 +1111,9 @@
 				D6E152A724BFFDF500FDF9D3 /* SceneDelegate.swift in Sources */,
 				D688F64A258C17F3003A0A73 /* SymbolCache.swift in Sources */,
 				D62BCEE2252553620031D894 /* ActivityView.swift in Sources */,
+				D688F65A258C2256003A0A73 /* BrowserNavigationController.swift in Sources */,
 				D691A68725223A4700348C4B /* NavigationBar.swift in Sources */,
+				D688F663258C2479003A0A73 /* UIViewController+Children.swift in Sources */,
 				D691A64E25217C6F00348C4B /* Preferences.swift in Sources */,
 				D6E152A924BFFDF500FDF9D3 /* ContentView.swift in Sources */,
 			);