Editing Changed

`UITextViewDelegate` has a very useful method: `-textViewDidChange:`. As the name implies, text view calls this method on its delegate whenever the text it is currently presenting is changed.

But, unlike `UITextViewDelegate`, `UITextFieldDelegate` doesn’t have such a method. Instead, it has a hidden gem that provides the same functionality.

UIControlEventEditingChanged

Meet our hero! You can either assign an `IBAction` for this event in Interface Builder or add a target and action in code.

This way, whenever a change appears on text field, it will call the action method assigned for `UIControlEventEditingChanged` event.