title: UISwipeGestureRecognizer not firing
body: <p>I have a UISwipeGestureRecognizer setup in IB linked to my view like so: </p>
  
  <p><img src="https://i.stack.imgur.com/Edha8.png" alt="enter image description here"></p>
  
  <p>Extremely trivial, done it a million times. However this time it never fires >:| </p>
  
  <p>Here is my method that <em>should</em> be called when a user swipes. </p>
  
  <p><img src="https://i.stack.imgur.com/rZ0im.png" alt="enter image description here"></p>
  
  <p>However this never gets called.</p>
  
  <ul>
  <li>No it's not accidentally added to a subview</li>
  <li>Yes the Pan gesture works perfectly. </li>
  </ul>
  
  <p>I have another view setup almost exactly the same as this that works fine. Any ideas? </p>