title: Detect sudden scroll stop in UIScrollView
body: <p>I would like to know how to use the <code>UIScrollViewDelegate</code> to detect when the scroll view stops moving suddenly because the user has touched and held the screen after momentum  has been initiated from a fast pan. </p>
  
  <p>The <code>scrollViewDidEndDecelerating:</code> method only fires for the above case when the user has lifted their finger. However, if the user taps and holds during scroll view momentum then this method doesn't fire (until they lift their finger). Is there anyways to intercept this when the scroll view stops dead upon the user's touch down?</p>