title: iPhone: Click view behind transparent UIScrollView
body: <p>I have a UIScrollView that is set to have a clear background.  Part of the scrollview does have content, but part does not (so it shows other views behind it).  I would like to be able to click through the UIScrollView and to the MKMapView behind, but only for the transparent portion of the UIScrollView.</p>
  
  <p>I have found some code which I am having a real hard time understanding how to get working:</p>
  
  <pre><code>- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      if (![self yourMethodThatDeterminesInterestingTouches:touches withEvent:event])
          [self.nextResponder touchesBegan:touches withEvent:event]; 
  }
  </code></pre>
  
  <p><strong>Could someone help me wrap my mind around how to forward a touch event to a view that is behind another view?  Can I call - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event from a UIViewController?</strong></p>