title: disable UIPageViewController gesture recognizer while in Handing longPressed gesture
body: <p>I have a UIPageViewController and each Page contains multiple UIViews on the page, each UIView allows Pan gesture after a longPress gesture, I use the following delegate in the contentVC, but it appears the pageVC doesn't care my restriction below and it continue to flip the page! do I have to do anything to disable the page turning while I am in panning? (the last resort will be setting an variable at the PageVC like a canTurn, and set it to NO while the panning is in action....</p>
  
  <pre><code>- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
  
      if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] &amp;&amp;
          [otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
          return YES;
      }
      return NO;
  }
  </code></pre>