title: iPhone how to cancel stop performSelector
body: <p>In my iPhone app, i'm using the following function to do something after some delay</p>
  
  <pre><code>- (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;
  </code></pre>
  
  <p>Is there any way to cancel this performSelector and stop doing some thing after the delay?</p>