title: How to recognize swipe gesture in UIScrollView
body: <p>I'm trying to recognize left/right swipe gesture in a <code>UIScrollView</code>. I've tried to create <code>UISwipeGestureRecognizers</code> and associate them with the scroll view. It works but very rarely. Most of the time I do not get called. Why?</p>
  
  <p>How can I reliably get swiping left/right to work? Can I use the gesture recognizers or do I have to somehow handle it myself in <code>touchesBegan/Ended</code></p>
  
  <p>Thanks</p>