title: Can't add action on UITextfield to view controller
body: <p>It was fine til suddenly i can't add action to <code>UITextfield</code> on xcode, the view controller's class name on storyboard == the view controller's code, no problem on adding action to UIButton, but UITextField has no action option when ctrl dragging to code :((</p>
  
  <p>I wonder what the hell happened</p>
  
  <p><a href="https://i.stack.imgur.com/X0MPB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/X0MPB.png" alt="no Action option"></a></p>