UITextField text change event

Question

How can I detect any text changes in a textField? The delegate method shouldChangeCharactersInRange works for something, but it did not fulfill my need exactly.

Answer 1

One thing is you may have multiple UITextFields. So, give them a tag and then you can switch on the tags. Here's how to setup an observer in any class pretty much.

private func setupTextFieldNotification() {
    NotificationCenter.default.addObserver(forName: UITextField.textDidChangeNotification, object: nil, queue: OperationQueue.main) { (notification) in
        if let textField = notification.object as? UITextField, textField.tag == 100, let text = textField.text {
            print(#line, text)
        }
    }
}

deinit {
    NotificationCenter.default.removeObserver(self)
}