title: UIGestureRecognizer on UILabel inside UIView inside UIScrollview
body: <p>I have a programatically created UILabel that uses autolayout inside a UIView, inside a UIScrollView. Initially it is off-screen and then slides onto screen (by animating the change of the autolayout constraint constants). I am trying to add a gesture recognizer (single tap) to the UILabel but the gesture never gets recognized. If I add one to the UIView, the gesture recognizer works. Does anyone know what the solution to this would be? Is this a problem caused by autolayout?
  Thanks.</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>This is definitely to do with the scrollview swallowing touches. I've just created the same label outside of the scrollview and the gesture recogniser works fine!</p>
  
  <p><strong>EDIT 2</strong>
  I can create the label within the scroll view using Interface Builder, but programmatically it doesn't work...</p>