Change height of inputAccessoryView issue

Question

When I change the height of inputAccessoryView in iOS 8, the inputAccessoryView not go to the right origin, but covers the keyboard.

Answer 1

The first answer didn't totally solve my problem but gave me a huge hint. Apple did add a private constraint to the accessory view, but you cannot find it in the constraint list of the accessory view. You have to search for it from its superview. It killed my a few hours.