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

To get the exact text in the my UITextField component in Swift 3.0 I used:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
   let enteredTxt = textField.text! + string
   doSomethingWithTxt(enteredTxt) //some custom method
}