tvOS 上的 UIViewControllerTransitioningDelegate 未被调用

Question

所以我正在尝试在 tvOS 10 上的 viewcontroller 之间进行动画转换。

tvOS 上提供了 UIViewControllerTransitioningDelegate 协议，所以我想我也可以为它设置动画。但是由于某些原因 none 函数在呈现新的 viewcontroller 时被调用。

我不知道我做错了什么，因为我在 iOS 上做的基本上完全一样。

这是我使用的代码：

显示代码

func showStuff() {
    let viewController = ResultViewController()
    viewController.transitioningDelegate = ResultViewControllerTransitionManager()
    viewController.modalPresentationStyle = .custom
    navigationController?.present(viewController, animated: true, completion: nil)
}

过渡代表

class ResultViewControllerTransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate {
    var duration = 0.5
    var isPresenting = false

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return duration
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from) else {return}
        guard let toView = transitionContext.view(forKey: UITransitionContextViewKey.to) else {return}

        (...)
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isPresenting = false
        return self
    }

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isPresenting = true
        return self
    }
}

Answer 1

您可以在第一个视图控制器中实现 UIViewControllerAnimatedTransitioning 和 UIViewControllerTransitioningDelegate 协议。您的第一个 UIViewController 可能具有以下代码：

class ViewController: UIViewController, UIViewControllerTransitioningDelegate, UIViewControllerAnimatedTransitioning {
    func showStuff() {
        let viewController = ResultViewController()
        viewController.transitioningDelegate = self
        viewController.modalPresentationStyle = .custom
        self.present(viewController, animated: true, completion: nil)
    }
    var duration = 0.5
    var isPresenting = false
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {

        return 2.0
    }
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from) else {return}
        guard let toView = transitionContext.view(forKey: UITransitionContextViewKey.to) else {return}

    }
}

另外，我展示了一个来自第一个控制器的新控制器（不是来自 navigationController）。

Answer 2

所以显然在 showStuff() 函数中初始化 animationmanager 是问题所在。将其作为属性存储在 Main viewcontroller 中并将其传递确实有效。

Answer 3

不会是因为您使用的是 navigationController，所以 navigationController?.delegate 需要等于您的 ResultViewControllerTransitionManager() 吗？

我们有一个使用推送动画的工作（应该是同一个问题），但我们设置

navigationController?.delegate = transitionDelegate

tvOS 上的 UIViewControllerTransitioningDelegate 未被调用

UIViewControllerTransitioningDelegate on tvOS not being called

swift

tvos