Custom nav controller

Reader.xcodeproj/project.pbxproj

@@ -47,6 +47,7 @@
 		D6E2436E278BD8160005E546 /* ReadViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6E2436D278BD8160005E546 /* ReadViewController.swift */; };
 		D6E24371278BE1250005E546 /* HTMLEntities in Frameworks */ = {isa = PBXBuildFile; productRef = D6E24370278BE1250005E546 /* HTMLEntities */; };
 		D6E24373278BE2B80005E546 /* read.css in Resources */ = {isa = PBXBuildFile; fileRef = D6E24372278BE2B80005E546 /* read.css */; };
+		D6EB531D278C89C300AD2E61 /* AppNavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6EB531C278C89C300AD2E61 /* AppNavigationController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -129,6 +130,7 @@
 		D6E2436A278BB1880005E546 /* HomeCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeCollectionViewCell.swift; sourceTree = "<group>"; };
 		D6E2436D278BD8160005E546 /* ReadViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ReadViewController.swift; sourceTree = "<group>"; };
 		D6E24372278BE2B80005E546 /* read.css */ = {isa = PBXFileReference; lastKnownFileType = text.css; path = read.css; sourceTree = "<group>"; };
+		D6EB531C278C89C300AD2E61 /* AppNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppNavigationController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -169,6 +171,7 @@
 		D65B18AF2750468B004A9448 /* Screens */ = {
 			isa = PBXGroup;
 			children = (
+				D6EB531C278C89C300AD2E61 /* AppNavigationController.swift */,
 				D65B18BF2750533E004A9448 /* Home */,
 				D65B18B027504691004A9448 /* Login */,
 				D6E2434A278B455C0005E546 /* Items */,
@@ -492,6 +495,7 @@
 				D6E2435F278B97240005E546 /* Group+CoreDataClass.swift in Sources */,
 				D6E24369278BABB40005E546 /* UIColor+App.swift in Sources */,
 				D6E2435D278B97240005E546 /* Item+CoreDataClass.swift in Sources */,
+				D6EB531D278C89C300AD2E61 /* AppNavigationController.swift in Sources */,
 				D6E24360278B97240005E546 /* Group+CoreDataProperties.swift in Sources */,
 				D6E2434C278B456A0005E546 /* ItemsViewController.swift in Sources */,
 				D6E2435E278B97240005E546 /* Item+CoreDataProperties.swift in Sources */,

Reader/SceneDelegate.swift

@@ -67,7 +67,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
     
     private func createAppUI() {
         let home = HomeViewController(fervorController: fervorController)
-        let nav = UINavigationController(rootViewController: home)
+        let nav = AppNavigationController(rootViewController: home)
         nav.navigationBar.prefersLargeTitles = true
         window!.rootViewController = nav
             

Reader/Screens/AppNavigationController.swift

@@ -0,0 +1,126 @@
+//
+//  AppNavigationController.swift
+//  Reader
+//
+//  Created by Shadowfacts on 1/10/22.
+//
+
+import UIKit
+
+class AppNavigationController: UINavigationController, UINavigationControllerDelegate {
+    
+    private var statusBarBlockingView: UIView!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        let appearance = UINavigationBarAppearance()
+        appearance.configureWithOpaqueBackground()
+        navigationBar.scrollEdgeAppearance = appearance
+
+        interactivePopGestureRecognizer?.isEnabled = false
+        let recognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized))
+        recognizer.allowedScrollTypesMask = .continuous
+        view.addGestureRecognizer(recognizer)
+        
+        isNavigationBarHidden = true
+        
+        statusBarBlockingView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
+        statusBarBlockingView.translatesAutoresizingMaskIntoConstraints = false
+        statusBarBlockingView.layer.zPosition = 101
+        view.addSubview(statusBarBlockingView)
+        
+        NSLayoutConstraint.activate([
+            statusBarBlockingView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            statusBarBlockingView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            statusBarBlockingView.topAnchor.constraint(equalTo: view.topAnchor),
+            statusBarBlockingView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
+        ])
+        
+        delegate = self
+    }
+    
+    func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
+        statusBarBlockingView.isHidden = viewController.prefersStatusBarHidden
+    }
+    
+    private var poppingViewController: UIViewController?
+    private var prevNavBarHidden = false
+    private var dimmingView: UIView = {
+        let v = UIView()
+        v.backgroundColor = .black
+        return v
+    }()
+    
+    @objc private func panGestureRecognized(_ recognizer: UIPanGestureRecognizer) {
+        let translation = recognizer.translation(in: view)
+        let translationProgress = max(0, translation.x) / view.bounds.width
+        
+        switch recognizer.state {
+        case .began:
+            guard viewControllers.count > 1 else {
+                break
+            }
+            prevNavBarHidden = isNavigationBarHidden
+            poppingViewController = popViewController(animated: false)
+            view.addSubview(poppingViewController!.view)
+            poppingViewController!.view.transform = CGAffineTransform(translationX: max(0, translation.x), y: 0)
+            poppingViewController!.view.layer.zPosition = 100
+            dimmingView.frame = view.bounds
+            dimmingView.layer.opacity = Float(1 - translationProgress) * 0.075
+            dimmingView.layer.zPosition = 99
+            view.addSubview(dimmingView)
+            // changing the transform directly on topViewController.view doesn't work for some reason, have to go 2 superviews up
+            topViewController!.view.superview?.superview?.transform = CGAffineTransform(translationX: (1 - translationProgress) * -0.3 * view.bounds.width, y: 0)
+            
+        case .changed:
+            guard let poppingViewController = poppingViewController else {
+                break
+            }
+
+            poppingViewController.view.transform = CGAffineTransform(translationX: max(0, translation.x), y: 0)
+            dimmingView.layer.opacity = Float(1 - max(0, translation.x) / view.bounds.width) * 0.075
+            topViewController!.view.superview?.superview?.transform = CGAffineTransform(translationX: (1 - translationProgress) * -0.3 * view.bounds.width, y: 0)
+            
+        case .ended:
+            guard let poppingViewController = poppingViewController else {
+                break
+            }
+            
+            let velocity = recognizer.velocity(in: view)
+            let shouldComplete = translation.x >= view.bounds.width / 2 || velocity.x >= 500
+            
+            UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseInOut) {
+                if shouldComplete {
+                    poppingViewController.view.transform = CGAffineTransform(translationX: self.view.bounds.width, y: 0)
+                    self.topViewController!.view.superview?.superview?.transform = .identity
+                } else {
+                    poppingViewController.view.transform = .identity
+                    self.topViewController!.view.superview?.superview?.transform = CGAffineTransform(translationX: -0.3 * self.view.bounds.width, y: 0)
+                }
+                self.dimmingView.layer.opacity = 0
+            } completion: { _ in
+                self.topViewController!.view.superview?.superview?.transform = .identity
+                
+                if shouldComplete {
+                    poppingViewController.beginAppearanceTransition(false, animated: true)
+                    poppingViewController.willMove(toParent: nil)
+                    poppingViewController.removeFromParent()
+                    poppingViewController.view.removeFromSuperview()
+                    poppingViewController.endAppearanceTransition()
+                } else {
+                    self.pushViewController(poppingViewController, animated: false)
+                    self.isNavigationBarHidden = self.prevNavBarHidden
+                }
+                
+                poppingViewController.view.layer.zPosition = 0
+                self.poppingViewController = nil
+                self.dimmingView.removeFromSuperview()
+            }
+
+        default:
+            break
+        }
+    }
+
+}

Reader/Screens/Read/ReadViewController.swift

@@ -66,18 +66,6 @@ class ReadViewController: UIViewController {
         
     }
     
-    override func viewWillAppear(_ animated: Bool) {
-        super.viewWillAppear(animated)
-        
-        navigationController?.hidesBarsOnSwipe = true
-    }
-    
-    override func viewWillDisappear(_ animated: Bool) {
-        super.viewWillDisappear(animated)
-        
-        navigationController?.hidesBarsOnSwipe = false
-    }
-    
     private func itemContentHTML() -> String? {
         guard let content = item.content else {
             return nil