Detect backspace Event in UITextField

Question

I am searching for solutions on how to capture a backspace event, most Stack Overflow answers are in Objective-C but I need on Swift language.

First I have set deleg

Answer 1

Swift 4

I find the comparison using strcmp irrelevant. We don't even know how strcmp is operating behind the hoods.In all the other answers when comparing current char and \b results are -8 in objective-C and -92 in Swift. I wrote this answer because the above solutions did not work for me. ( Xcode Version 9.3 (9E145) using Swift 4.1 )

FYI : Every character that you actually type is an array of 1 or more elements in utf8 Encoding. backSpace Character is [0]. You can try this out.

PS : Don't forget to assign the proper delegates to your textFields.

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

    let  char = string.cString(using: String.Encoding.utf8)!
    if (char.elementsEqual([0])) {
        print("Backspace was pressed")
    }
    else {
        print("WHAT DOES THE FOX SAY ?\n")
        print(char)
    }
    return true
}