Why is my NSNotification its observer called multiple times?

Question

Within an App I make use of several viewcontrollers. On one viewcontroller an observer is initialized as follows:

[[NSNotificationCenter defaultCenter] remov         


        

Answer 1

In which methods did you register the observers?

Apple recommends that observers should be registered in viewWillAppear: and unregistered in viewWillDissapear:

Are you sure that you don't register the observer twice?