title: How to call the -(void)update:(CCTime)delta method in Objective-C
body: <p>Is there a way to call the <code>-(void)update:(CCTime)delta</code> method in objective-c? I know that (using sprite builder) I can create a scene and then have it be attached to a custom class so that when the scene is loaded through the CCBReader, the class's update method is automatically called. </p>
  
  <p>I am now loading the scene through code without a custom class but would still like the update method to "start" (for lack of a better word.) Is there a way to do this?</p>