dealloc上是否需要removeObserver？ [英] is removeObserver necessary on dealloc?

问题描述

在我的一个视图控制器中，它将自身添加为UITextViewTextDidEndEditingNotification通知的观察者，如下所示

In one of my view controller, it adds itself as observer of UITextViewTextDidEndEditingNotification notification, like the following does

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(done:) name:UITextViewTextDidEndEditingNotification object:nil];

现在我想知道 - 当视图控制器被释放时我是否需要执行以下操作

Now I am wondering - do I need to do the following when the view controller is dealloc'd

[[NSNotificationCenter defaultCenter] removeObserver:self];

推荐答案

是的，你应该随时删除任何观察者被解除了。否则通知中心将继续引用现有的dealloc'd对象，并继续尝试向他们转发通知。

yes, you should always remove any observers when they're being dealloc'd. otherwise the notification center will keep references to the now-dealloc'd objects around and continue to try to forward notifications to them.

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