better logic of use keyboardWillChangeFrame
better logic of use keyboardWillChangeFrame

CallumOz/KeyboardMan,jonesgithub/KeyboardMan,jonesgithub/KeyboardMan,nixzhu/KeyboardMan,CallumOz/KeyboardMan,zhouwude/KeyboardMan,jonesgithub/KeyboardMan,nixzhu/KeyboardMan,zhouwude/KeyboardMan