How to do a live UITextField count while typing (Swift)?

Question

I would like to count the character when user keep typing in UITextField with swift.

Image of Field and Label:

Answer 1

A very elegant and neat solution exists using UITextFieldDelegate. My solution uses the concept of selectors. In a selector you tell your compiler what function/action to perform when a particular event happens. In this case - typing in textfield. Make sure that you have set the textField delegate in storyboard.

override func viewDidLoad() {
   super.viewDidLoad()
   yourTextField.addTarget(self, action: #selector(YourViewController.textFieldDidChange(_:)), for: UIControlEvents.EditingChanged)
}

@objc func textFieldDidChange(textField : UITextField){
   label.text = yourTextField.text?.count
}