title: iOS - IBAction - in which text field the user is typing
body: <p>I have 2 text fields in my app and both are connected with my "devTyping" IBAction.
  This method (I guess it is a method) will be called when the event "editing changed" happens.</p>
  
  <p>How can I tell my method, in which text field the user is typing?</p>
  
  <pre><code>- (IBAction)devTyping {
      NSLog(@"How to know in which text field the user is typing?");
  }
  </code></pre>