如何在tvOS遥控器中处理菜单按钮动作

Question

我遇到了应用程序的一个奇怪问题。实际上，当我呈现一个视图控制器来播放视频时，用户在视频加载时按下菜单按钮，应用程序进入后台。虽然我已经覆盖了菜单按钮操作。

这是我的代码。

override func viewWillAppear(animated: Bool) {
    let menuPressRecognizer = UITapGestureRecognizer()
    menuPressRecognizer.addTarget(self, action: #selector(VideoPlayerViewController.menuButtonAction(_:)))
    menuPressRecognizer.allowedPressTypes = [NSNumber(integer: UIPressType.Menu.hashValue)]
    self.playerController.view.addGestureRecognizer(menuPressRecognizer)
}

func menuButtonAction(ges:UITapGestureRecognizer) {
    self.dismissView()
 }

- Sankalap Yaduraj Singh

Answer 1

这是我的代码，已经在我的设备上运行正常。 Swift 3

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    let menuPressRecognizer = UITapGestureRecognizer()
    menuPressRecognizer.addTarget(self, action: #selector(YourViewController.menuButtonAction(recognizer:)))
    menuPressRecognizer.allowedPressTypes = [NSNumber(value: UIPressType.menu.rawValue)]
    self.view.addGestureRecognizer(menuPressRecognizer)
}

func menuButtonAction(recognizer:UITapGestureRecognizer) {
    self.dismiss(animated: true, completion: nil)
}

Swift 4

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    let menuPressRecognizer = UITapGestureRecognizer()
    menuPressRecognizer.addTarget(self, action: #selector(YourViewController.menuButtonAction(recognizer:)))
    menuPressRecognizer.allowedPressTypes = [NSNumber(value: UIPressType.menu.rawValue)]
    self.view.addGestureRecognizer(menuPressRecognizer)
}

@objc func menuButtonAction(recognizer:UITapGestureRecognizer) {
    self.dismiss(animated: true, completion: nil)
}

Swift 4.2和5

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    let menuPressRecognizer = UITapGestureRecognizer()
    menuPressRecognizer.addTarget(self, action: #selector(YourViewController.menuButtonAction(recognizer:)))
    menuPressRecognizer.allowedPressTypes = [NSNumber(value: UIPress.PressType.menu.rawValue)]
    self.view.addGestureRecognizer(menuPressRecognizer)
}

@objc func menuButtonAction(recognizer:UITapGestureRecognizer) {
    self.dismiss(animated: true, completion: nil)
}

- anas.p

---

请记住，如果您还要重写shouldUpdateFocus和preferredFocusEnvironments方法，则UITapGestureRecognizer解决方案比覆盖presses withEvent方法更理想。因为UITapGestureRecognizer不会取消其他焦点事件，而presses overrides会这样做。 - PostCodeism

如何在SwiftUI中获取allowedPressTypes？ - Abhishek Thapliyal

Answer 2

当你指定allowedPressTypes时，应该使用枚举的rawValue而不是hash： menuPressRecognizer = [NSNumber(value: UIPressType.menu.rawValue)]

- Michał Ciuba

Answer 3

这也可以在IB中完成。TapGestureRecognizer的按钮选项中包括菜单按钮。

- Joe Susnick

Answer 4

当您想要添加多个值时，可以简单地执行以下操作：

let pressTypes: [NSNumber] = [UIPressType.select, UIPressType.playPause, UIPressType.rightArrow].map{ NSNumber(value: $0.rawValue)}

- feca

Answer 5

Swift 5：

private func setupRemoteGesture() {
    let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleMenuPress))
    tapRecognizer.allowedPressTypes = [NSNumber(value: UIPress.PressType.menu.rawValue)]
    view.addGestureRecognizer(tapRecognizer)
}

@objc private func handleMenuPress() {
    // Menu button pressed
}

- atulkhatri

Answer 6

为了更加精细化，您还可以使用以下方法：

- (void)pressesBegan:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);
- (void)pressesChanged:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);
- (void)pressesEnded:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);
- (void)pressesCancelled:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);

请确保根据苹果公司以下的建议覆盖所有这些方法，如果您选择使用它们中的任何一个：

一般来说，所有进行自定义按压处理的响应者都应该覆盖这四个方法。

对于每个它正在处理的按压（在pressesBegan:withEvent:中接收到的那些按压），您的响应者将接收到pressesEnded:withEvent或pressesCancelled:withEvent:。

对于提供模拟值的按压（如拇指杆或模拟推按钮），将调用pressesChanged:withEvent:。

*** 您必须处理取消的按压以确保应用程序的正确行为。不这样做很可能会导致应用程序出现错误行为或崩溃。

- atulkhatri