检查 UIViewController 是否即将从导航堆栈中弹出? [英] Checking if a UIViewController is about to get Popped from a navigation stack?

问题描述

我需要知道我的视图控制器何时将从导航堆栈中弹出，以便我可以执行操作.

I need to know when my view controller is about to get popped from a nav stack so I can perform an action.

我不能使用 -viewWillDisappear，因为当视图控制器因任何原因移出屏幕时会被调用(比如一个新的视图控制器被推到顶部).

I can't use -viewWillDisappear, because that gets called when the view controller is moved off screen for ANY reason (like a new view controller being pushed on top).

我特别需要知道控制器什么时候会自己弹出.

I specifically need to know when the controller is about to be popped itself.

任何想法都会很棒，提前致谢.

Any ideas would be awesome, thanks in advance.

推荐答案

我不认为对此有明确的消息，但是您可以将 UINavigationController 子类化并覆盖 - popViewControllerAnimated(尽管我自己之前没有尝试过)).

I don't think there is an explicit message for this, but you could subclass the UINavigationController and override - popViewControllerAnimated (although I haven't tried this before myself).

或者，如果没有其他对视图控制器的引用，您可以添加到它的 - dealloc 中吗?

Alternatively, if there are no other references to the view controller, could you add to its - dealloc?

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