自定义UIModalPresentationStyle.custom:为什么presentationController(forPresented被调用而animationController不被调用)(forPresented？

Question

我在用UIModalPresentationStyle.custom。

在我的UIViewControllerTransitioningDelegate中，为什么调用这个方法：

func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?

但是这些函数都没有被调用：

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?

func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?

func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?

Answer 1

在调用时，确保将animated Bool设置为true

present(viewController, animated: true, completion: nil)

和

dismiss(animated: true, completion: nil)