title: UINavigationController interactivePopGestureRecognizer working abnormal in iOS7
body: <p>In iOS7, we have a new "swipe left to right" gesture, this is a very useful feature, but now I have a problem with it.</p>
  
  <p>I use this code to custom the back button in <code>UINavigationBar</code>.</p>
  
  <p><code>self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:view];</code></p>
  
  <p>but this will disables the "swipe left to right" gesture, so I use the follow code to keep the gesture enabled.</p>
  
  <p><code>self.navigationController.interactivePopGestureRecognizer.delegate = self</code></p>
  
  <p>And then, I found that the gesture is working abnormal, if current ViewController has a tableView, when the tableView is scrolling, the gesture won't be triggered. Now the gesture can't be triggered easily, is there some way to fix it?</p>