title: Importing view controllers for delegation not working
body: <p>I have a view controller, FirstViewController, with a subclass, FourthViewController. FirstViewController's interface is:</p>
  
  <pre><code>#import "FourthViewController.h"
  @interface FirstViewController : UIViewController &lt;FourthViewControllerDelegate&gt;
  </code></pre>
  
  <p>In FourthViewController's .h, I have:</p>
  
  <pre><code>#import "FirstViewController.h"
  
  @protocol FourthViewControllerDelegate
  -(void) updateLabel;
  @end
  
  @interface FourthViewController : FirstViewController 
  
  @property (weak, nonatomic) id&lt;FourthViewControllerDelegate&gt;delegate;
  </code></pre>
  
  <p>This is giving me the error message: Cannot find interface declaration of 'FirstViewController', superclass of 'FourthViewController'
  I'm not sure why this error is occuring. Any advice would help.</p>