Move from one text field to another - ios

Question

How can I make text field-1 move to another text field-2 by Swift when I write two numbers?
When I write 22, I want to automatically move to another text field-2.
I tried this but it doesn't work:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if let text = textField.text {
let newStr = (text as NSString)
.stringByReplacingCharactersInRange(range, withString: string)
if newStr.isEmpty {
return true
}
let intvalue = Int(newStr)
if textField.tag == 101 { print("101") // only 2 integer
return (intvalue >= 0 && intvalue <= 99) ? true : false
}
else if textField.tag == 102 { print("102") // only 4 integer
return (intvalue >= 0 && intvalue <= 9999) ? true : false
}
}
return true
}

Answer 1

textField.addTarget(self, action: #selector(textDidChanged(textField:)), for: .editingChanged)
func textDidChanged(textField: UITextField)
{
if (textField.text) == "22"
{
newTextField.becomeFirstResponder()
}
}
add delegate to both the textfields
also add UITextFieldDelegate to your viewcontroller

Answer 2

Create IBAction for both textfields like this and check first textfield's characters count in IBAction. If count is 2 second textfield will become active.
#IBAction func textEntered(_ sender: UITextField) {
if sender.tag == 101 && sender.text?.characters.count == 2
{
(self.view.subviews.first(where: { $0.tag == 102 }) as! UITextField).becomeFirstResponder()
}
}

Answer 3

You should add a target for editingChanged event of your textField like below or simply drag an action from storyboard in to your class :
textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: UIControlEvents.editingChanged)
then in your selector do as follow :
func textFieldDidChange(_ textField: UITextField) {
if textField.tag == 101 && textField.text!.characters.count >= 2 {
secondTextField.becomeFirstResponder()
}
}

Answer 4

No need to do more,
just modify your shouldChangeCharactersIn range
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let finalText = (textField.text ?? "")// + string
if textField === self.textField1! && finalText.characters.count >= 2 {
self.textField1.resignFirstResponder()
self.textField2.becomeFirstResponder()
return false
}
else if textField === self.textField2! && finalText.characters.count >= 4 {
self.textField2.resignFirstResponder()
self.textField1.becomeFirstResponder()
return false
}
return true
}
Try not to use the tag in the code as it's not understandable to other programmers after you on the project.