How to stop the Observer in NSNotification to called twice?

Question

I have an observer of NSNotification which is called twice. I do not know what to do with it.

I googled it but no solution found.

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Answer 1

If your addObserver method is run multiple times, it will create multiple observers. My issue was that I somehow placed my observer in viewWillAppear which appeared multiple times before I posted the notification and it resulted in my observer being called multiple times.

While EmptyStack's 3rd solution works, there is a reason your observer is being called twice, so by finding it, you can prevent needless lines of code instead of removing and adding the same observer.

I would suggest putting your observer in viewDidLoad to avoid simple errors like the one I experienced.