title: Is it possible to use iOS 7 UIViewController transitions (interactive specifically) with child view controllers?
body: <p>There's many tutorials floating around about using the new iOS 7 UIViewController transitions API and the great new interactive transition API. However, none of these seem to reference adding and removing child view controllers interactively, despite in the WWDC 2013 video on Custom UIViewController Transitions the Apple employee shows what I would imagine to be a child view controller presented with a custom transition:</p>
  
  <p><img src="https://i.stack.imgur.com/RrBZW.png" alt="enter image description here"></p>
  
  <p>(I'm assuming this as a view controller is shown on top of another one seemingly. I don't think you can transition to a new UIViewController while keeping the other visible behind it...)</p>
  
  <p>Is it possible to achieve such a thing with child view controllers?</p>
  
  <p>In my specific situation, I'm adding a <code>UIPageViewController</code> image gallery as a child view controller but you can still see the view controller it was added to if the image the <code>UIPageViewController</code> doesn't take up the full screen. I have also added the ability to slide an image off screen (akin to the iOS 7 multi-tasking close) and I'd love that to be an interactive view controller pop.</p>
  
  <p>Are there any tutorials for such a thing? Is it even possible? Would this be better done with <code>presentViewController</code> somehow that would allow me to view the view controller beneath?</p>