How to move cursor from one text field to another automatically in swift ios programmatically?

Question

    func textFieldDidBeginEditing(textField: UITextField) {
    scrlView.setContentOffset(CGPointMake(0, textField.frame.origin.y-70), animated: true)


    if(textField == firstDigit){

        textField.becomeFirstResponder()
        secondDigit.resignFirstResponder()
    }


    else if(textField == secondDigit){

        textField.becomeFirstResponder()
        thirdDigit.resignFirstResponder()
    }

    else if(textField == thirdDigit){
        //textField.becomeFirstResponder()
        fourthDigit.becomeFirstResponder()
    }

I am using four textfields for OTP entry in which only one number can be entered at a time. After entering the number I need to move the cursor automatically to next textfield.

Answer 1

Set textField delegate and add target:

override func viewDidLoad() {
        super.viewDidLoad()

        first.delegate = self
        second.delegate = self
        third.delegate = self
        fourth.delegate = self


        first.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
        second.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
        third.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
        fourth.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
    }

Now when text changes change textField

func textFieldDidChange(textField: UITextField){

    let text = textField.text

    if text?.utf16.count >= 1{
        switch textField{
        case first:
            second.becomeFirstResponder()
        case second:
            third.becomeFirstResponder()
        case third:
            fourth.becomeFirstResponder()
        case fourth:
            fourth.resignFirstResponder()
        default:
            break
        }
    }else{

    }
}

And lastly when user start editing clear textField

extension ViewController: UITextFieldDelegate{
    func textFieldDidBeginEditing(textField: UITextField) {
        textField.text = ""
    }
}

Answer 2

update Solution For Swift 5

In This solution, You will go to next Field. And When You Press Erase will come at previous text field.

Step 1: Set Selector for Text Field

override func viewDidLoad() {
        super.viewDidLoad()

         otpTextField1.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    otpTextField2.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    otpTextField3.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    otpTextField4.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
        
    }

Step 2: Now We will handle move next text Field and Erase text Field.

@objc func textFieldDidChange(textField: UITextField){
        let text = textField.text
        if  text?.count == 1 {
            switch textField{
            case otpTextField1:
                otpTextField2.becomeFirstResponder()
            case otpTextField2:
                otpTextField3.becomeFirstResponder()
            case otpTextField3:
                otpTextField4.becomeFirstResponder()
            case otpTextField4:
                otpTextField4.resignFirstResponder()
            default:
                break
            }
        }
        if  text?.count == 0 {
            switch textField{
            case otpTextField1:
                otpTextField1.becomeFirstResponder()
            case otpTextField2:
                otpTextField1.becomeFirstResponder()
            case otpTextField3:
                otpTextField2.becomeFirstResponder()
            case otpTextField4:
                otpTextField3.becomeFirstResponder()
            default:
                break
            }
        }
        else{

        }
    }

Important Note: Don't Forget To set Delegate.