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

Provide the tag to the textfield like 1,2,3,4 and directly use it

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


    let next:NSInteger

    if string == "" {

        next = textField.tag - 1;

    }
    else{

        next = textField.tag + 1;

    }

    if (textField.text?.characters.count)! >= 1 {

        if textField.tag == 4 {

            if string == "" {

                textField.text = ""

                let temptf = self.view.viewWithTag(next) as! UITextField

                temptf.becomeFirstResponder()

                return false

            }
            else{

                if (textField.text?.characters.count)! > 1 {

                    let stringg = textField.text!
                    textField.text = stringg.replacingOccurrences(of: stringg, with: string)
                }
                return false
            }
        }
        else{
            if string == "" {

                textField.text = ""

                if next != 0 {

                    let temptf = self.view.viewWithTag(next) as! UITextField
                    temptf.becomeFirstResponder()

                }

                return false
            }

            else{

                if (textField.text?.characters.count)! > 1 {


                    let stringg = textField.text!
                    textField.text = stringg.replacingOccurrences(of: stringg, with: string)

                }

                    let temptf = self.view.viewWithTag(next) as! UITextField

                    temptf.becomeFirstResponder()

            }
        }
    }

    return true

}