title: iOS 9 iPad split screen completion/finished notification
body: <p>I am implementing the new feature in iOS 9 for new iPads of having multitasking of 2 apps with split screen. </p>
  
  <p>I can't seem to find a <code>completion</code> method of when the split screen adjustment has finished after user has dragged the <strong>app view size handle</strong>.</p>
  
  <p>How exactly do I notify my app that my app is being run in a split screen?</p>
  
  <p>NOTE: This is different from <code>UISplitViewController</code>. I am referring to the multitasking of 2 apps in split screen, not <code>UISplitViewController</code></p>