ios allows apps to display custom input views for the system keyboard. It also enables apps to have an accessory view above the system keyboard or custom input view. Additionally, it enables apps to play key-click sounds when users tap on a controls of an input view or input accessory view.
For details tutorial Check out : http://iavinashkashyap.blogspot.in/2016/07/custom-input-view-for-system-keyboard_16.html