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How to detect removal of ios IP address

Does anyone know how to detect the removal from the numeric keypad in ios?

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If you use UITextField, your delegate textField:shouldChangeCharactersInRange:replacementString:will be called with a range of length 1 and an empty replacement. However, if nothing is deleted, you will not receive a notification.

If you use a UITextView, your delegate textView:shouldChangeTextInRange:replacementText:will be called with a range of length 1 and an empty replacement. However, if nothing is deleted, you will not receive a notification.

, UIKeyInput, , deleteBackward. , , UITextInput ( UIKeyInput), replaceRange:withText: setMarkedText:selectedRange: 1 , .

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