How can I get a textDidChange (like for a UISearchBar) method for a UITextField?

Question

How can I get a textDidChange method for a UITextField? I need to call a method every time a change is made to a text field. Is this possible? Thanks!

Answer 1

Below is what I used Swift 4

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

    guard let fieldText = textField.text else {
        return false
    }
    // Append the existing textfield text with the new character
    var text = fieldText + string
    // If it is the very first character, textfield text will be empty so take the 'string' and on delete also textfield text get deleted with a delay
    if range.location == 0{
       text = string
    }
    return true
}