How to move to the next UITextField automatically in Swift - ios

Question

I have 2 textFields with NumberPad keyboard type
#IBOutlet weak var ourTextField: UITextField!
#IBOutlet weak var forThemTextField: UITextField!
and I want to automatically move to the other textfield (from ourTextField to forThemTextField) after entering two numbers inside the ourTextField then after going to the other textfield (forThemTextField) and entering 2 numbers I want the keyboard hide automatically
I have added a condition to only accept two numbers in my textFields by this code :
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let lengthsDictionary = [ourTextField : 2, forThemTextField: 2]
guard let length = lengthsDictionary[textField] else {
return true
}
let currentCharacterCount = textField.text?.count ?? 0
if (range.length + range.location > currentCharacterCount){
return false
}
let newLength = currentCharacterCount + string.count - range.length
return newLength <= length
}

Answer 1

Use shouldChangeCharactersIn of UITextFieldDelegate method & listen with keyboard string
Use tag of textFields, like tag 1 & tag 2
as
class TestingViewController: UIViewController{
#IBOutlet weak var firstTextField: UITextField!
#IBOutlet weak var secondTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
firstTextField.delegate = self
secondTextField.delegate = self
firstTextField.tag = 1
secondTextField.tag = 2
firstTextField.keyboardType = .numberPad
secondTextField.keyboardType = .numberPad
}
}
extension TestingViewController: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
return textField.shouldChangeCustomOtp(textField: textField, string: string)
}
}
extension UITextField {
func shouldChangeCustomOtp(textField:UITextField, string: String) ->Bool {
//Check if textField has two chacraters
if ((textField.text?.count)! == 1 && string.count > 0) {
let nextTag = textField.tag + 1;
// get next responder
var nextResponder = textField.superview?.viewWithTag(nextTag);
if (nextResponder == nil) {
nextResponder = textField.superview?.viewWithTag(1);
}
textField.text = textField.text! + string;
//write here your last textfield tag
if textField.tag == 2 {
//Dissmiss keyboard on last entry
textField.resignFirstResponder()
}
else {
///Appear keyboard
nextResponder?.becomeFirstResponder();
}
return false;
} else if ((textField.text?.count)! == 1 && string.count == 0) {// on deleteing value from Textfield
let previousTag = textField.tag - 1;
// get prev responder
var previousResponder = textField.superview?.viewWithTag(previousTag);
if (previousResponder == nil) {
previousResponder = textField.superview?.viewWithTag(1);
}
textField.text = "";
previousResponder?.becomeFirstResponder();
return false
}
return true
}
}
Output:

Answer 2

In viewDidLoad :-
ourTextField?.addTarget(self, action: #selector(CalculatorViewController.textFieldDidChange(_:)), for: UIControlEvents.editingChanged)
forThemTextField?.addTarget(self, action: #selector(CalculatorViewController.textFieldDidChange(_:)), for: UIControlEvents.editingChanged)
//create function
func textFieldDidChange(_ textField: UITextField) {
if textField == ourTextField {
if (textField.text.count)! >= 2 {
forThemTextField?.becomeFirstResponder()
}
}
else if textField == forThemTextField {
if (textField.text?.count)! >= 2 {
forThemTextField.resignFirstResponder()
}
}
}

Answer 3

Add target to the UITextField (in viewDidLoad()), for example:
mTfActuallyFrom?.addTarget(self, action: #selector(CalculatorViewController.textFieldDidChange(_:)), for: UIControlEvents.editingChanged)
In the delegate function, use UITextField.becomeFirstResponder() to move the focus to the next textfield. Change your conditions to your requirement. For example:
func textFieldDidChange(_ textField: UITextField) {
if textField == mTfActuallyFrom {
if (textField.text?.characters.count)! >= 4 {
mTfActuallyTo?.becomeFirstResponder()
}
}
else if textField == mTfActuallyTo {
if (textField.text?.characters.count)! >= 4 {
dismissKeyboard(gesture: nil)
}
}
}