title: How to use UIGestureRecognizerDelegate?
body: <p><strong>My Setup</strong></p>
  
  <p>I'm trying to replicate Google Now's card interface.</p>
  
  <p>I have a <code>UIView</code> which is a subview of (inside) a <code>UIScrollView</code>. Both are controlled from the same <code>UIViewController</code>. The <code>UIView</code> has a <code>UIPanGestureRecognizer</code> attached to it by the <code>UIViewController</code>.</p>
  
  <p>The <code>UIScrollView</code> is used to scroll up and down. The <code>UIPanGestureRecognizer</code> is used to swipe away the <code>UIView</code>.</p>
  
  <p><strong>The Problem</strong></p>
  
  <p>I can't scroll when I'm touching the <code>UIView</code> (the card)</p>
  
  <p><strong>The Question</strong></p>
  
  <p>How do I implement <code>UIGestureRecognizerDelegate</code> to enable <code>gestureRecognizer(_:shouldRecognizeSimultaneouslyWithGestureRecognizer:)</code> on the card so that it'll let the <code>UIScrollView</code> scroll?</p>
  
  <p>I've spent several hours trying to figure this out, and I would be incredibly thankful for help.</p>