How can I detect if the height of the keyboard has changed in iOS 8?

Question

On iOS 8, keyboards can be different heights. When the user switches between keyboards, or changes the height of the current keyboard, how can I detect this?

Answer 1

Listen to the UIKeyboardWillChangeFrameNotification notification.

Use UIKeyboardFrameBeginUserInfoKey and UIKeyboardFrameEndUserInfoKey values in the passed userInfo dictionary to retrieve the current and future frame of the keyboard.