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| 1 | +import UIKit |
| 2 | + |
| 3 | +// Custom Window to have proper simulation of presentation and dismissal lifecycle events |
| 4 | +final class HammerWindow: UIWindow { |
| 5 | + private let hammerViewController = HammerViewController() |
| 6 | + |
| 7 | + override var safeAreaInsets: UIEdgeInsets { |
| 8 | + return .zero |
| 9 | + } |
| 10 | + |
| 11 | + init() { |
| 12 | + super.init(frame: UIScreen.main.bounds) |
| 13 | + self.rootViewController = self.hammerViewController |
| 14 | + |
| 15 | + if #available(iOS 13.0, *) { |
| 16 | + self.backgroundColor = .systemBackground |
| 17 | + } else { |
| 18 | + self.backgroundColor = .white |
| 19 | + } |
| 20 | + } |
| 21 | + |
| 22 | + @available(*, unavailable) |
| 23 | + required init?(coder: NSCoder) { |
| 24 | + fatalError("init(coder:) has not been implemented") |
| 25 | + } |
| 26 | + |
| 27 | + func presentContained(_ viewController: UIViewController) { |
| 28 | + self.makeVisibleAndKey() |
| 29 | + self.hammerViewController.presentContained(viewController) |
| 30 | + } |
| 31 | + |
| 32 | + func dismissContained() { |
| 33 | + self.hammerViewController.dismissContained() |
| 34 | + self.removeFromScene(removeViewController: false) |
| 35 | + } |
| 36 | +} |
| 37 | + |
| 38 | +private final class HammerViewController: UIViewController { |
| 39 | + private let containerView = UIView() |
| 40 | + |
| 41 | + override var shouldAutomaticallyForwardAppearanceMethods: Bool { false } |
| 42 | + override var prefersStatusBarHidden: Bool { true } |
| 43 | + |
| 44 | + override func viewDidLoad() { |
| 45 | + super.viewDidLoad() |
| 46 | + self.view.backgroundColor = .clear |
| 47 | + self.containerView.translatesAutoresizingMaskIntoConstraints = false |
| 48 | + self.view.addSubview(self.containerView) |
| 49 | + |
| 50 | + // We only activate the top and leading constraints to allow the content to size itself. |
| 51 | + NSLayoutConstraint.activate([ |
| 52 | + self.containerView.topAnchor.constraint(equalTo: self.view.topAnchor), |
| 53 | + self.containerView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor), |
| 54 | + self.containerView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor), |
| 55 | + self.containerView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor), |
| 56 | + ]) |
| 57 | + } |
| 58 | + |
| 59 | + func presentContained(_ viewController: UIViewController) { |
| 60 | + viewController.beginAppearanceTransition(true, animated: false) |
| 61 | + self.addChild(viewController) |
| 62 | + |
| 63 | + viewController.view.translatesAutoresizingMaskIntoConstraints = false |
| 64 | + self.containerView.addSubview(viewController.view) |
| 65 | + NSLayoutConstraint.activate([ |
| 66 | + viewController.view.topAnchor.constraint(equalTo: self.containerView.topAnchor), |
| 67 | + viewController.view.bottomAnchor.constraint(equalTo: self.containerView.bottomAnchor), |
| 68 | + viewController.view.leadingAnchor.constraint(equalTo: self.containerView.leadingAnchor), |
| 69 | + viewController.view.trailingAnchor.constraint(equalTo: self.containerView.trailingAnchor), |
| 70 | + ]) |
| 71 | + |
| 72 | + viewController.didMove(toParent: self) |
| 73 | + viewController.endAppearanceTransition() |
| 74 | + self.view.layoutIfNeeded() |
| 75 | + } |
| 76 | + |
| 77 | + func dismissContained() { |
| 78 | + for viewController in self.children { |
| 79 | + viewController.beginAppearanceTransition(false, animated: false) |
| 80 | + viewController.willMove(toParent: nil) |
| 81 | + viewController.view.removeFromSuperview() |
| 82 | + viewController.removeFromParent() |
| 83 | + viewController.endAppearanceTransition() |
| 84 | + } |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +extension UIWindow { |
| 89 | + func makeVisibleAndKey(file: StaticString = #file, line: UInt = #line) { |
| 90 | + self.addToMainSceneIfNeeded(file: file, line: line) |
| 91 | + self.makeKeyAndVisible() |
| 92 | + } |
| 93 | + |
| 94 | + func addToMainSceneIfNeeded(file: StaticString = #file, line: UInt = #line) { |
| 95 | + guard #available(iOS 13.0, *) else { |
| 96 | + return |
| 97 | + } |
| 98 | + |
| 99 | + guard self.windowScene == nil else { |
| 100 | + return |
| 101 | + } |
| 102 | + |
| 103 | + if let mainScene = UIScene.mainOrFirstConnectedScene { |
| 104 | + self.windowScene = mainScene |
| 105 | + } else { |
| 106 | + assertionFailure("Unable to find main scene", file: file, line: line) |
| 107 | + } |
| 108 | + } |
| 109 | + |
| 110 | + func removeFromScene(removeViewController: Bool = true) { |
| 111 | + self.isHidden = true |
| 112 | + |
| 113 | + if #available(iOS 13.0, *) { |
| 114 | + self.windowScene = nil |
| 115 | + } |
| 116 | + |
| 117 | + if removeViewController { |
| 118 | + self.rootViewController = nil |
| 119 | + } |
| 120 | + } |
| 121 | +} |
| 122 | + |
| 123 | +@available(iOS 13.0, *) |
| 124 | +private extension UIScene { |
| 125 | + static var mainOrFirstConnectedScene: UIWindowScene? { |
| 126 | + let scenes = UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene } |
| 127 | + return scenes.first { $0.screen == UIScreen.main } ?? scenes.first |
| 128 | + } |
| 129 | +} |
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