How shouldChangeCharactersInRange works in Swift?

Question

I\'m using shouldChangeCharactersInRange as a way of using on-the-fly type search.

However I\'m having a problem, shouldChangeCharactersInRange get

Answer 1

This function is called when changes are made but UI is not updated and waiting for your choice

Take a look at returned bool value

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool

• If you return true - it means that iOS accept changes(text, caret...)
• If you return false - it means that you are responsible for all this stuff