Allowing single digit in UITextField in iOS

Question

I have a Verification ViewController, I get 4 digit verification code by SMS and I need to enter those code to login, I have created the ViewController

Answer 1

I was working on a similar functionality and did it in my way. Solution below. Swift 4

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

 //For clear button pressed
 //If the textfield has already text in it
 if string.count == 0 {
    textField.text = string
    return true
 }

 //For First time entry into the text field
 guard let text = textField.text, text.count <= 0  else {
    //If user enter second character
    return false
 }
 //For First time entry into the text field
 if text.count == 0  {
     textField.text = string
     textField.resignFirstResponder()
     self.nextResponde(tag: textField.tag)
     return true
  }
  return false
}

//To make the next field as responder
func nextResponde(tag: Int) {
    switch tag {
    case self.PINTextField.tag:
        guard let text = self.PINTextField1.text, text.count == 1 else {
            self.PINTextField1.becomeFirstResponder()
            return
        }
    case self.PINTextField1.tag:
        guard let text = self.PINTextField2.text, text.count == 1 else {
            self.PINTextField2.becomeFirstResponder()
            return
        }
    case self.PINTextField2.tag:
        guard let text = self.PINTextField3.text, text.count == 1 else {
            self.PINTextField3.becomeFirstResponder()
            return
        }
    default:
        let _ = tag
    }
}