I'm crashing and getting an unrecognized selector error every time a Notification arrives and the App tries to execute its associated method. Here's my code - which is in viewDidLoad: let notifica...

Looking at various Apple examples (for example Add Music) in which I see they add observers to the default NSNotificationCenter in viewDidLoad, then remove them in dealloc. This seems dangerous as ...

Is it possible to add observers to simple variables such as BOOLs or NSIntegers and see when they change? Thanks!

I have a case where the child view sends notification to its parent view. Now I'm calling addObserver: in viewWillAppear: and removeObserver: in viewWillDisappear:. But, I'm guessing this is not co...