如何取消设置代理上的UIView setAnimationDelegate：打电话？ [英] How to unset delegate on UIView setAnimationDelegate: call?

问题描述

我收到了，似乎是从一个UIView动画调用已dealloced委托崩溃报告。

I am receiving crash reports that appear to be from a UIView animation calling a delegate that has been dealloced.

    Thread 0 Crashed:
0   libobjc.A.dylib                 0x334776f6 objc_msgSend + 18
1   UIKit                           0x31c566c4 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:]
2   UIKit                           0x31c565d2 -[UIViewAnimationState animationDidStop:finished:]
3   QuartzCore                      0x30045a26 run_animation_callbacks

我设置当前视图控制器为委托模式如下动画：

I am setting the current view controller as the delegate for animations using the following pattern:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelegate:self];
...
[UIView commitAnimations];

我的问题是，我该如何设置我的dealloc方法该委托引用零？是否有某种方式保留到动画的参考？或正在进行获取动画？

My question is, how do I set that delegate reference to nil in my dealloc method? Is there some way to retain a reference to an animation? Or fetch animations in progress?

推荐答案

的CALayer的类处理UIViews所有动画。您可以使用层属性来访问的UIView的层。如果你要替换的第一个参数[UIView的beginAnimations：背景：] 与实际字符串，将有可能直接使用的CALayer的 animationForKey：和 removeAnimationForKey：方法

The CALayer class handles all animations for UIViews. You can access the UIView's layer using the layer property. If you were to replace the first argument of [UIView beginAnimations: context:] with an actual string, it would be possible to access that animation directly using CALayer's animationForKey: and removeAnimationForKey: methods.

在这种情况下，虽然，它可能是足以叫 [view.layer removeAllAnimations] 在的dealloc 调用 [超级的dealloc] 。这将停止任何自定义的UIView动画，很明显，从层中删除。

In this case though, it might be enough to call [view.layer removeAllAnimations] before dealloc calls [super dealloc]. This will stop any custom UIView animations and, obviously, remove them from its layer.

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