How can I detect changes in UITextField when I change textfield.text property?

Question

I'm managing user actions in UITextField with func textFieldShouldReturn(_ textField: UITextField) -> Bool and it works perfectly but if I set textField.text = "String" This is not being called, I also tried with IBActions like valueChanged and DidEndEditing with no success

Any idea how can I solve this?

Answer 1

The delegate methods are not called when you change the text property programmatically.

But when you change the property in code you know that and when the value changed.

For example write a common function

func updateTextField(with string: String) {
    textField.text = string
    doSomethingAfterTextChanged()
}

Or use a property observer which is called when the value of textFieldValue changed

var textFieldValue : String {
    didSet {
        textField.text = textFieldValue
        doSomethingAfterTextChanged()
    }
}

Answer 2

You can do that. Add this code in your viewDidLoad

yourTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: UIControl.Event.editingChanged);

Add this function in your viewController

 @objc func textFieldDidChange(_ textField: UITextField)
 {
        // you are done check your value do something
 }