Custom reimplementation of textField(_:shouldChangeCharactersIn:replacamentString:)

TextField+shouldChangeCharactersIn.swift

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let currentText = textField.text! as NSString
        let newText = currentText.replacingCharacters(in: range, with: string)
        textField.text = newText
        return false
    }

Hi Kristof,
Could you please explain why you return false in this case? Or is this a typo?

@AnatoliyOstapenko I return false because I'm handling the replacing of the text and I don't want the system to do anything.

However I forgot why I created this piece of code. In this form this code doesn't change anything you might as well not implement it. I guess that if you wanted manipulate the input of the user then this could be useful.

e.g. If you want to map keys on the keyboard to different characters. You can map "A" to "a" or a more sinister thing "A" to "b".

I'm sure I had something in mind for this code that I forgot.

Hi Kristof,
I have already figured it out) It’s interesting case. Thanks for replying