how to detect backspace of numeric keyboard on a secured textfield [duplicate] - ios

This question already has answers here:
Detect backspace in empty UITextField
(28 answers)
How to detect delete key on an UITextField in iOS 8?
(10 answers)
Closed 5 years ago.
Hi I have a need to detect backspace button event on textfield.
Common way to detect the backspace is to add the whitespace and see the changed text.
But
As the textfield is secured textfield.adding the whitespace trick won't work out.
Any helpful suggestions are welcome
Edit - don't close :
This is not a duplicate question because its about doing it on secured textfield and this is not a duplicate of below questions
Detect backspace in UITextField
How to detect delete key on an UITextField in iOS 8?

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