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AutoRemoveObserver
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iOS Auto-removing NSNotifications
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README.md
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AutoRemoveObserver
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AutoRemoveObserver ================== The problem with NotificationCenter and KVO observers is that you have to remember to remove the observing object when it gets dealloc'ed or your app will crash on the next notification. The methods below create a small "remover" object that is associated with the observer object such that when the observer object gets dealloc'ed this object will also get dealloc'ed *and* remove the observations. N.B.: This class is designed to remove the observer when the observer is dealloc'ed. If you need to remove the observer before that then you should use the standard methods and be sure to handle the dealloc case yourself. Instead of writing: // Selector based [[NSNotificationCenter defaultCenter] addObserver:notificationObserver selector:notificationSelector name:notificationName object:notificationSender]; // Block based [[NSNotificationCenter defaultCenter] addObserverForName:name object:obj queue:queue usingBlock:block]; // KVO [self addObserver:anObserver forKeyPath:keyPath options:options context:context]; you write: // Selector based [INTUAutoRemoveObserver addObserver:notificationObserver selector:notificationSelector name:notificationName object:notificationSender]; // Block based [INTUAutoRemoveObserver addObserver:self forName:name object:obj queue:queue usingBlock:block]; // KVO [INTUAutoRemoveObserver addObserver:anObserver forKeyPath:keyPath options:options context:context onReceiverObject:self]; E.g.: // Selector based [INTUAutoRemoveObserver addObserver:self selector:@selector(myMethod) name:@"BroadcastNotification" object:nil]; // Block based MyObject* __weak weakSelf = self; // So the block doesn't retain us [INTUAutoRemoveObserver addObserver:self forName:@"BroadcastNotification" object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) { [weakSelf observeMe]; }]; // KVO [INTUAutoRemoveObserver addObserver:self // self or some observer object. When this is dealloc'ed then observer is removed. forKeyPath:NSStringFromSelector(@selector(myProperty)) options:NSKeyValueObservingOptionNew context:nil onReceiverObject:self]; N.B.: If the observer is self you will see an error in the log file about the instance being deallocated while key observers were still registered to it (even though they are removed as a side effect of self getting dealloc'ed) when self is dealloc'ed.
