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

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 = ""    }}

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.

Swift 3 code to move the cursor from one field to another automatically in OTP(One Time Password) fields.

    //Add all outlet in your code.     @IBOutlet weak var otpbox1: UITextField!    @IBOutlet weak var otpbox2: UITextField!    @IBOutlet weak var otpbox3: UITextField!    @IBOutlet weak var otpbox4: UITextField!    @IBOutlet weak var otpbox5: UITextField!    @IBOutlet weak var otpbox6: UITextField!    // Add the delegate in viewDidLoad    func viewDidLoad() {        super.viewDidLoad()        otpbox1?.delegate = self        otpbox2?.delegate = self        otpbox3?.delegate = self        otpbox4?.delegate = self        otpbox5?.delegate = self        otpbox6?.delegate = self    }    func textField(_ textField: UITextField, shouldChangeCharactersIn range:NSRange, replacementString string: String) -> Bool {        // Range.length == 1 means,clicking backspace    if (range.length == 0){        if textField == otpbox1 {            otpbox2?.becomeFirstResponder()        }        if textField == otpbox2 {            otpbox3?.becomeFirstResponder()        }        if textField == otpbox3 {            otpbox4?.becomeFirstResponder()        }        if textField == otpbox4 {            otpbox5?.becomeFirstResponder()        }        if textField == otpbox5 {            otpbox6?.becomeFirstResponder()        }        if textField == otpbox6 {            otpbox6?.resignFirstResponder() /*After the otpbox6 is filled we capture the All the OTP textField and do the server call. If you want to capture the otpbox6 use string.*/            let otp = "\((otpbox1?.text)!)\((otpbox2?.text)!)\((otpbox3?.text)!)\((otpbox4?.text)!)\((otpbox5?.text)!)\(string)"        }        textField.text? = string        return false    }else if (range.length == 1) {            if textField == otpbox6 {                otpbox5?.becomeFirstResponder()            }            if textField == otpbox5 {                otpbox4?.becomeFirstResponder()            }            if textField == otpbox4 {                otpbox3?.becomeFirstResponder()            }            if textField == otpbox3 {                otpbox2?.becomeFirstResponder()            }            if textField == otpbox2 {                otpbox1?.becomeFirstResponder()            }            if textField == otpbox1 {                otpbox1?.resignFirstResponder()            }            textField.text? = ""            return false    }    return true    }