title: Objective C: Extend From Different Classes
body: <p>I want to extend my <code>ViewController</code> from <code>MKNetworkEngine</code> class but I have already extended it from <code>UIViewController</code> class. How can I extend them both?
  Here's my code:</p>
  
  <pre><code>#import &lt;UIKit/UIKit.h&gt;
  #import &lt;SystemConfiguration/SystemConfiguration.h&gt;
  #import "MKNetworkKit.h"
  
  @interface ViewController : MKNetworkEngine UIViewController&lt;UITableViewDataSource,UITableViewDelegate,UINavigationControllerDelegate&gt;
  </code></pre>
  
  <p>Thanks for your help.</p>