[英]UIViewControllerTransitioningDelegate being deinitialized immediately after it is presented
I'm trying to present a view controller modally with a custom presenter using UIPresentationController
(and UIViewControllerTransitioningDelegate
). 我试图使用
UIPresentationController
(和UIViewControllerTransitioningDelegate
)与自定义演示者以模态展示视图控制器。
The problem is that the transitioning delegate is being deinitialized immediately after animationController(presented:presenting:source:)
is called. 问题在于, 在调用
animationController(presented:presenting:source:)
之后立即将过渡委托进行初始化。 This means animationController(dismissed:)
never gets called - and thus, a dismissal animation cannot be set. 这意味着无法调用
animationController(dismissed:)
-因此无法设置解雇动画。
In the end, I want to be able to define the dismissal animation. 最后,我希望能够定义解雇动画。 I believe what I explained above is the root of the problem, but can't find anything about this online.
我相信我上面所解释的是问题的根源,但是在网上找不到任何有关此的信息。
Here is my implementation of UIViewControllerTransitioningDelegate
: 这是我的
UIViewControllerTransitioningDelegate
实现:
final class Manager: NSObject, UIViewControllerTransitioningDelegate {
private let size: CGSize
var animator: Animator
init(size: CGSize) {
self.size = size
self.animator = Animator(duration: 0.4, loaf: loaf)
}
deinit {
print("DEINIT") // 2) Then this is being called immediately after
}
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
return Controller(
presentedViewController: presented,
presenting: presenting,
size: size
)
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
animator.presenting = true
return animator // 1) This is called first after the view controller is presented
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
animator.presenting = false
return animator // 3) This is never called
}
}
And this is how I'm setting the transitioning delegate: 这就是我设置过渡委托的方式:
extension UIViewController {
func presentModally(_ viewController: UIViewController, size: CGSize) {
viewController.transitioningDelegate = Manager(size: size)
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)
}
}
When the view controller is then dismissed, the view always defaults to being pushed down and disappearing. 然后关闭视图控制器时,视图始终默认为被按下并消失。 Again,
animationController(dismissed:)
is never called and I can't figure out why. 同样,
animationController(dismissed:)
从未被调用过,我也不知道为什么。
I was able to fix this by storing a reference to the UIViewControllerTransitioningDelegate
on the presenting view controller. 我能够通过在当前视图控制器上存储对
UIViewControllerTransitioningDelegate
的引用来解决此问题。 Then, when presenting the modal, set it like this: 然后,在呈现模态时,应像这样设置它:
extension UIViewController {
func presentModally(_ viewController: UIViewController, size: CGSize) {
viewController.transDelegate = Manager(size: size)
viewController.transitioningDelegate = viewController.transDelegate
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)
}
}
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