How to detect delete key on an UITextField in iOS 8?

Question

I have subclassed UITextField and implemented the UIKeyInput protocol\'s deleteBackward method to detect backspace being pressed. This works fine on iOS 7 but not on iOS 8.<

Answer 1

swift 2:

if (string.characters.count == 0 && range.length == 1) {
            return true
}

you should use like this string.characters.count