title: How do I call animateAlongsideTransition in Swift?
body: <p>I've tried so many combinations in order to call <code>animateAlongSideTransition</code> in Swift for a transition coordinator. I feel like I'm missing something very stupid.</p>
  
  <p>If I want to call this (from Swift docs):</p>
  
  <pre><code>func animateAlongsideTransition(_ animation: ((UIViewControllerTransitionCoordinatorContext!) -&gt; Void)!,
                       completion completion: ((UIViewControllerTransitionCoordinatorContext!) -&gt; Void)!) -&gt; Bool
  </code></pre>
  
  <p>How would I do it? I just want to pass some things in the animation block and nothing in the completion block.</p>