UIKeyboardDidShowNotification called multiple times, and sometimes with incorrect keyboard dimensions

Question

I am trying to move a UITextView above the keyboard whenever the keyboard appears/changes. Let\'s say I have the English keyboard displaying and then switch directly to the Chin

Answer 1

The primary reason is that the your notification is invoked multiple times. For example, in swift, if you had the NSNotificationCenter.defaultCenter().addObserver(xx"keyboardWillShow"xx) inside viewWillAppear method and if you are going back and forth between the view then it will result in having multiple observer of the same "keyboardWillShow". Instead you should consider moving the addObserver call to "viewDidLoad()" method. Alternatively you can register/deregister observer when the view appears/disappears.