取消segue不会释放我的视图控制器 [英] Unwind segue does not release my view controllers

问题描述

我有这样的东西:

我的rootViewController是navigationBar-设为A.其余的都是正常的UIViewControllers，并且通过按键(通过按钮IBAction方法)以编程方式进行搜索.

My rootViewController is a navigationBar - let this be A. The rest are normal UIViewControllers, and are programmatically segue via push (through a button IBAction method).

但是，从D-> A出发，我使用了unsegue segue(也通过performSegueWithIdentifier:sender:).

However going from D -> A, I use unwind segue (also via performSegueWithIdentifier:sender:).

这里的问题是，执行segue时，B，C和D根本不是deallocated.这不仅会导致内存泄漏问题，而且我的计时器仍在运行.我不确定为什么会这样.我以为轻松的搜寻应该为您处理所有这些吗?知道为什么吗?

The issue here is that when the segue is performed, B, C and D are not deallocatedat all. Not only is this causing a memory leak issue but my timers are still running. I'm not sure why this is the case. I thought unwind segues are suppose to handle all these for you? Any idea why?

推荐答案

问题出在NSTimer.

NSTimer保留其目标.因此，如果视图控制器使用target:self启动计时器，则只要计时器正在运行，它就不会被释放.

NSTimer retain their target. So if a view controller starts a timer with target:self, it will not be deallocated as long as the timer is running.

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