swift – 如何在按钮焦点上执行tvOS中的动作事件

您可以为每个按钮分配一个标记,并使用聚焦按钮的标记来确定要采取的操作.为了便于阅读,您可以为每个标记定义一个包含值的枚举.

enum FocusedButtonTag: Int {
    case First // Substitute with names that correspond to button's title/action
    case Second
    case Third
    case Fourth
}

override func didUpdateFocusInContext(context: UIFocusUpdateContext,withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
    super.didUpdateFocusInContext(context,withAnimationCoordinator: coordinator)
    guard let button = UIScreen.mainScreen().focusedView as? UIButton else {
        return
    }
    // Update your UIView with the desired information based on the focused button
    switch button.tag {
        case FocusedButtonTag.First.rawValue:
            ... // first button's action
        case FocusedButtonTag.Second.rawValue:
            ... // second button's action
        case FocusedButtonTag.Third.rawValue:
            ... // third button's action
        case FocusedButtonTag.Fourth.rawValue:
            ... // fourth button's action
        default:
            break
    }
}