如何在UIView中删除NSNotification的观察者？

Question

I've added an observer in a custom UIView I've created under initWithFrame: .

[[NSNotificationCenter defaultCenter] addObserver:self 
         selector:@selector(updateZipFromLocation:) 
          name:@"zipFoundFromLocation" 
           object:nil];

The problem is, this view is a subview. When the view is loaded again, it calls the initWithFrame message again, thus adding two observers and so on. How can I remove the observer when the view is going to disappear? Since it is a UIView , it says that viewWillDisappear:(BOOL)animated is not a valid method. Any ideas?

Answer 1

You've said that initWithFrame: is being called more than once, so I assume this means that the view is being destroyed and recreated. You can remove the view as an observer in dealloc , which will be called when the view is no longer retained by anyone:

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}