title: dismissing Number Pad
body: <p>In my app I have a text field that takes some number input from user so i set the keyboard type to "Number Pad"but now i am stuck as to how should i dismiss it when user finishes giving input . i know i have to use the delegate method "textfieldShouldReturn" but the problem is that number pad dont have a return key.so is it necessary to add a custom done key on the keyboard or there is some other way out?</p>