removeObserver with NSNotification… what am I doing wrong?

Question

Basically, I have a view1 which at some point, calls view2 (via presentModalViewController:animated:). When a certain UIButton in view2 is pressed,

Answer 1

Calling -dealloc doesn't automatically happen after the view controller is dismissed — there can still be some "life" left in the view controller's lifetime. In that timeframe, that view controller is still subscribed for that notification.

If you remove the observer in -viewWillDisappear: or -viewDidDisappear:, this will have a more immediate effect:

- (void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:@"alert" 
                                                  object:nil];
}