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Simulates view controller lifecycle more accurately
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| import UIKit | ||
|
|
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| // Custom Window to have proper simulation of presentation and dismissal lifecycle events | ||
| final class HammerWindow: UIWindow { | ||
| private let hammerViewController = HammerViewController() | ||
|
|
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| override var safeAreaInsets: UIEdgeInsets { | ||
| return .zero | ||
| } | ||
|
|
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| init() { | ||
| super.init(frame: UIScreen.main.bounds) | ||
| self.rootViewController = self.hammerViewController | ||
|
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| if #available(iOS 13.0, *) { | ||
| self.backgroundColor = .systemBackground | ||
| } else { | ||
| self.backgroundColor = .white | ||
| } | ||
| } | ||
|
|
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| @available(*, unavailable) | ||
| required init?(coder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
|
|
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| func presentContained(_ viewController: UIViewController) { | ||
| self.makeVisibleAndKey() | ||
| self.hammerViewController.presentContained(viewController) | ||
| } | ||
|
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| func dismissContained() { | ||
| self.hammerViewController.dismissContained() | ||
| self.removeFromScene(removeViewController: false) | ||
| } | ||
| } | ||
|
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| private final class HammerViewController: UIViewController { | ||
| private let containerView = UIView() | ||
|
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| override var shouldAutomaticallyForwardAppearanceMethods: Bool { false } | ||
| override var prefersStatusBarHidden: Bool { true } | ||
|
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
| self.view.backgroundColor = .clear | ||
| self.containerView.translatesAutoresizingMaskIntoConstraints = false | ||
| self.view.addSubview(self.containerView) | ||
|
|
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| // We only activate the top and leading constraints to allow the content to size itself. | ||
| NSLayoutConstraint.activate([ | ||
| self.containerView.topAnchor.constraint(equalTo: self.view.topAnchor), | ||
| self.containerView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor), | ||
| self.containerView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor), | ||
| self.containerView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor), | ||
| ]) | ||
| } | ||
|
|
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| func presentContained(_ viewController: UIViewController) { | ||
| viewController.beginAppearanceTransition(true, animated: false) | ||
| self.addChild(viewController) | ||
|
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| viewController.view.translatesAutoresizingMaskIntoConstraints = false | ||
| self.containerView.addSubview(viewController.view) | ||
| NSLayoutConstraint.activate([ | ||
| viewController.view.topAnchor.constraint(equalTo: self.containerView.topAnchor), | ||
| viewController.view.bottomAnchor.constraint(equalTo: self.containerView.bottomAnchor), | ||
| viewController.view.leadingAnchor.constraint(equalTo: self.containerView.leadingAnchor), | ||
| viewController.view.trailingAnchor.constraint(equalTo: self.containerView.trailingAnchor), | ||
| ]) | ||
|
|
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| viewController.didMove(toParent: self) | ||
| viewController.endAppearanceTransition() | ||
| self.view.layoutIfNeeded() | ||
| } | ||
|
|
||
| func dismissContained() { | ||
| for viewController in self.children { | ||
| viewController.beginAppearanceTransition(false, animated: false) | ||
| viewController.willMove(toParent: nil) | ||
| viewController.view.removeFromSuperview() | ||
| viewController.removeFromParent() | ||
| viewController.endAppearanceTransition() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension UIWindow { | ||
| func makeVisibleAndKey(file: StaticString = #file, line: UInt = #line) { | ||
| self.addToMainSceneIfNeeded(file: file, line: line) | ||
| self.makeKeyAndVisible() | ||
| } | ||
|
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| func addToMainSceneIfNeeded(file: StaticString = #file, line: UInt = #line) { | ||
| guard #available(iOS 13.0, *) else { | ||
| return | ||
| } | ||
|
|
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| guard self.windowScene == nil else { | ||
| return | ||
| } | ||
|
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| if let mainScene = UIScene.mainOrFirstConnectedScene { | ||
| self.windowScene = mainScene | ||
| } else { | ||
| assertionFailure("Unable to find main scene", file: file, line: line) | ||
| } | ||
| } | ||
|
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| func removeFromScene(removeViewController: Bool = true) { | ||
| self.isHidden = true | ||
|
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| if #available(iOS 13.0, *) { | ||
| self.windowScene = nil | ||
| } | ||
|
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| if removeViewController { | ||
| self.rootViewController = nil | ||
| } | ||
| } | ||
| } | ||
|
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| @available(iOS 13.0, *) | ||
| private extension UIScene { | ||
| static var mainOrFirstConnectedScene: UIWindowScene? { | ||
| let scenes = UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene } | ||
| return scenes.first { $0.screen == UIScreen.main } ?? scenes.first | ||
| } | ||
| } |
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