Optimize code and support rotation

Tiptoes/Tiptoes.xcodeproj/project.pbxproj

@@ -9,7 +9,6 @@
 /* Begin PBXBuildFile section */
 		674123551E279E47007E4393 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 674123541E279E47007E4393 /* AppDelegate.swift */; };
 		674123571E279E47007E4393 /* TopMostViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 674123561E279E47007E4393 /* TopMostViewController.swift */; };
-		6741235C1E279E47007E4393 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6741235B1E279E47007E4393 /* Assets.xcassets */; };
 		6741235F1E279E47007E4393 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 6741235D1E279E47007E4393 /* LaunchScreen.storyboard */; };
 		674123671E279EBC007E4393 /* TiptoesNavController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 674123661E279EBC007E4393 /* TiptoesNavController.swift */; };
 		674123691E27A01F007E4393 /* BelowBackViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 674123681E27A01F007E4393 /* BelowBackViewController.swift */; };
@@ -19,7 +18,6 @@
 		674123511E279E47007E4393 /* Tiptoes.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Tiptoes.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		674123541E279E47007E4393 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		674123561E279E47007E4393 /* TopMostViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TopMostViewController.swift; sourceTree = "<group>"; };
-		6741235B1E279E47007E4393 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		6741235E1E279E47007E4393 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		674123601E279E47007E4393 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		674123661E279EBC007E4393 /* TiptoesNavController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TiptoesNavController.swift; sourceTree = "<group>"; };
@@ -60,7 +58,6 @@
 				674123561E279E47007E4393 /* TopMostViewController.swift */,
 				674123681E27A01F007E4393 /* BelowBackViewController.swift */,
 				674123661E279EBC007E4393 /* TiptoesNavController.swift */,
-				6741235B1E279E47007E4393 /* Assets.xcassets */,
 				6741235D1E279E47007E4393 /* LaunchScreen.storyboard */,
 				674123601E279E47007E4393 /* Info.plist */,
 			);
@@ -128,7 +125,6 @@
 			buildActionMask = 2147483647;
 			files = (
 				6741235F1E279E47007E4393 /* LaunchScreen.storyboard in Resources */,
-				6741235C1E279E47007E4393 /* Assets.xcassets in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -298,6 +294,7 @@
 				674123651E279E47007E4393 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};

Tiptoes/Tiptoes/AppDelegate.swift

@@ -12,18 +12,11 @@ import UIKit
 class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
-    var navigationController: TiptoesNavController!
-    var homeViewController: BelowBackViewController!
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
         window = UIWindow(frame: UIScreen.main.bounds)
-        homeViewController = BelowBackViewController()
-        navigationController = TiptoesNavController(rootViewController: homeViewController)
-        window?.rootViewController = navigationController
+        window?.rootViewController = TiptoesNavController(rootViewController: BelowBackViewController())
         window?.makeKeyAndVisible()
-
-        UIApplication.shared.statusBarStyle = .lightContent
-
         return true
     }
 

Tiptoes/Tiptoes/BelowBackViewController.swift

@@ -10,19 +10,26 @@ import UIKit
 
 class BelowBackViewController: UIViewController {
 
+    lazy var demoButton: UIButton = {
+        let b = UIButton()
+        b.setTitle("JUMP TO NEXT", for: .normal)
+        b.setTitleColor(UIColor.black, for: .normal)
+        b.addTarget(self, action: #selector(nav), for: .touchUpInside)
+        return b
+    }()
+
     override func viewDidLoad() {
         super.viewDidLoad()
 
         title = "HOME"
-        view.backgroundColor = UIColor(red: 59.0/255.0, green: 62.0/255.0, blue: 67.0/255.0, alpha: 1.0)
-        let button = UIButton()
-        button.setTitle("Button", for: .normal)
-        button.sizeToFit()
-        button.center = view.center
-        button.setTitleColor(UIColor.white, for: .normal)
-        button.addTarget(self, action: #selector(nav), for: .touchUpInside)
-
-        view.addSubview(button)
+        view.backgroundColor = .white
+        view.addSubview(demoButton)
+    }
+
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        demoButton.center = view.center
+        demoButton.sizeToFit()
     }
 
     func nav(){

Tiptoes/Tiptoes/TiptoesNavController.swift

@@ -15,11 +15,11 @@ class TiptoesNavController: UINavigationController {
     override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
         super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
     }
-
+    
     override init(rootViewController: UIViewController) {
         super.init(navigationBarClass: TiptoesNavBar.self, toolbarClass: nil)
         viewControllers = [rootViewController]
-    } // 因为子类提供了这个 Designated Method，因此不会自动继承 init(nibName:bundle:) 方法，但是 init(nibName:bundle:) 又是必须实现的，那么就遵循一下吧。可以说这是一个 bug，是应该在父类的 init(nibName:bundle:) 前加入 required 关键字的。
+    }
 
     required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
@@ -31,28 +31,32 @@ class TiptoesNavController: UINavigationController {
         // Hide the system navigation bar
         navigationBar.isHidden = true
         interactivePopGestureRecognizer?.addTarget(self, action: #selector(handleTiptoesDisplay(sender:)))
-        configureNavigationBar()
+        setupBar()
     }
 
-    fileprivate func configureNavigationBar() {
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+
         guard let bar = navigationBar as? TiptoesNavBar else { return }
-        view.addSubview(bar.tiptoes)
-        view.addSubview(bar.currentTitleLabel)
-        view.addSubview(bar.priorTitleLabel)
         bar.tiptoes.frame = CGRect(x: 0, y: view.frame.height - tiptoesHeight, width: view.frame.width, height: tiptoesHeight)
         bar.currentTitleLabel.sizeToFit()
         bar.currentTitleLabel.center = CGPoint(x: view.center.x, y: bar.tiptoes.center.y)
         bar.priorTitleLabel.frame = bar.currentTitleLabel.frame
     }
 
+    fileprivate func setupBar() {
+        guard let bar = navigationBar as? TiptoesNavBar else { return }
+        view.addSubview(bar.tiptoes)
+        view.addSubview(bar.currentTitleLabel)
+        view.addSubview(bar.priorTitleLabel)
+    }
+
     @objc private func handleTiptoesDisplay(sender: UIGestureRecognizer) {
         guard let bar = navigationBar as? TiptoesNavBar else { return }
 
-        // You can customize the transition style here
         let portionValue = sender.location(in: view).x
         let currentAlpha = portionValue / view.frame.width
 
-        // Magic number is to fix the bug that when pan gesture goed half and stop
         bar.currentTitleLabel.alpha = (1 - currentAlpha) < 0.5 ? (1 - currentAlpha) * 2 : 1 // 1 -> 0
         bar.priorTitleLabel.alpha = currentAlpha > 0.5 ? currentAlpha * 2 - 1 : 0 // 0 -> 1
     }
@@ -85,6 +89,7 @@ extension TiptoesNavController: UINavigationBarDelegate {
         if numberOfViewControllers > 0 {
             if let popTitle = viewControllers[numberOfViewControllers - 1].title {
                 bar.priorTitleLabel.text = popTitle
+                bar.priorTitleLabel.sizeToFit()
             }
         }
         return true
@@ -107,7 +112,7 @@ class TiptoesNavBar: UINavigationBar {
     var currentTitleLabel: UILabel = {
         let label = UILabel()
         label.font = UIFont.systemFont(ofSize: 8)
-        label.textColor = UIColor.white
+        label.textColor = UIColor.black
         label.text = "HOME"
         label.textAlignment = .center
         return label
@@ -117,14 +122,13 @@ class TiptoesNavBar: UINavigationBar {
     var priorTitleLabel: UILabel = {
         let label = UILabel()
         label.font = UIFont.systemFont(ofSize: 8)
-        label.textColor = UIColor.white
+        label.textColor = UIColor.black
         label.textAlignment = .center
         return label
     }()
 
     var tiptoes: UIView = {
         let toes = UIView()
-        toes.backgroundColor = UIColor(red: 66.0/255.0, green: 69.0/255.0, blue: 78.0/255.0, alpha:1.0)
         return toes
     }()
 

Tiptoes/Tiptoes/TopMostViewController.swift

@@ -10,12 +10,24 @@ import UIKit
 
 class TopMostViewController: UIViewController {
 
+    lazy var hintLabel: UILabel = {
+        let l = UILabel()
+        l.textColor = .black
+        l.text = "SWIPE TO RETURN"
+        l.sizeToFit()
+        return l
+    }()
+
     override func viewDidLoad() {
         super.viewDidLoad()
-
         title = "NEXT"
-        view.backgroundColor = UIColor(red: 59.0/255.0, green: 62.0/255.0, blue: 67.0/255.0, alpha: 1.0)
+        view.addSubview(hintLabel)
+        view.backgroundColor = .white
     }
 
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        hintLabel.center = view.center
+    }
 }