title: How to detect when an AVPlayerItem is finished playing?
body: <p>I've been looking through the <code>AVPlayerItem</code> and <code>AVPlayer</code> docs and there doesn't seem to be any callbacks for when the item is finished playing. I was hoping that there would be some sort of delegate callback that we can utilize or that <code>AVPlayerActionAtItemEnd</code> would provide a custom action for us to write.  </p>
  
  <p>How can i figure out a way to detect when AVPlayer has finished playing an item?</p>