title: Extend default interactivePopGestureRecognizer beyond screen edge?
body: <p>I have a <code>UIViewController</code> that gets pushed onto a navigation stack. I'd like to extend the standard iOS7 interactive pan gesture to pop this view controller beyond the default <code>UIRectEdgeLeft</code> boundaries, so that users can initiate an interactive back action by panning from anywhere on the view. </p>
  
  <p>I've tried rolling my own interactive view controller transition, but it's a lot of hassle to fully replicate the nice parallax handling of the default <code>interactivePopGestureRecognizer</code>. For example, the <code>fromViewController</code> hides the navigation bar, while the <code>toViewController</code> shows it—something that is not easy to handle in a custom interactive transition, but is seamless in the default action.</p>
  
  <p>As a result, I want to extend the default action to a larger area of pan gesture, but the API doesn't seem to support simply replacing the gesture.</p>
  
  <p>Any creative suggestions?</p>