[ViewControllergestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:]:消息发送到释放实例 [英] [ViewController gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:]: message sent to deallocated instance

问题描述

我有一个简单的场景.

我将 myViewController 推送到导航堆栈上.

I push myViewController onto navigation stack.

myViewController 基本上是在整个屏幕上显示集合视图.我在这个集合视图上添加了一个额外的 UIPanGestureRecognizer 并将 myViewController 设置为它的委托.我在 myViewController 中保留了对该平移手势识别器的强引用.

myViewController is basically showing a collection view over entire screen. I added an additional UIPanGestureRecognizer on this collection view and set myViewController as its delegate. I am retaining a strong reference to that pan gesture recognizer inside myViewController.

当我点击返回时，myViewController 从导航堆栈中弹出并释放.myViewController 的 dealloc 方法被调用.到目前为止，一切都按预期工作.

When I tap Back, myViewController gets popped from the navigation stack and deallocated. The myViewController's dealloc method gets called as it should. Up to this point everything works as expected.

然后我尝试像第一次一样打开相同的 myViewController 并且崩溃发生消息:

Then I try to open the same myViewController like the first time and the crash occurs with the message:

[MyViewController gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:]: message sent to deallocated instance

我在 myViewController 中实现了这个方法，它总是返回 YES.但这甚至无关紧要，因为没有人甚至不应该调用此方法，因为没有人应该对它有强引用.显然有人仍然持有弱引用，因为 dealloc 方法是在唯一存在的实例上调用的.

I have this method implemented in myViewController and it always returns YES. But this shouldn't even matter because no one should even be calling this method because none should have a strong reference to it. Obviously someone is still holding a weak reference since the dealloc method was called on the only instance that ever existed.

甚至没有调用 MyViewController 的 init 方法.

Not even the init method of the MyViewController gets called.

我尝试将以下代码同时放在 dealloc 和 viewWillDisappear 中:

I tried to put the following code both in dealloc and in viewWillDisappear:

[self.myPanGestureRecognizer removeTarget:self action:@selector(panGestureAction:)];
    [self.collectionView removeGestureRecognizer:self.myPanGestureRecognizer];
    self.myPanGestureRecognizer.delegate = nil;
    self.myPanGestureRecognizer = nil;

但是，它没有改变任何东西.每次同样的事情 - myViewController 得到 initialized 并在第一次正常显示.第二次尝试初始化和推送时，出现异常.很明显，这和我添加的平移手势识别器有关，但我不知道如何.

But, it didn't change anything. Every time the same thing - myViewController gets initialized and displayed normally the first time. The second time I try to initialize and push, the exception occurs. Obviously, it is related to the pan gesture recognizer that I added, but I don't see how.

推荐答案

这个问题的答案最终解决了我的非常相似的问题:gestureRecognizer shouldReceiveTouch 在释放的视图中持续导致崩溃

The answer to this question ended up fixing my issue that was very similar: gestureRecognizer shouldReceiveTouch persisting in deallocated view causing crash

我错误地将 self.navigationController.interactivePopGestureRecognizer.delegate 设置为 self.

I was incorrectly setting self.navigationController.interactivePopGestureRecognizer.delegate to self.

所以即使从 NSZombie 报告的错误是在另一个类中.它的手势识别器实际上并不是罪魁祸首，而是我的 InteractivePopGestureRecognizer.

So even though the error reported from the NSZombie was in another class. It's gesture recognizer was not actually the culprit, it was my interactivePopGestureRecognizer.

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