title: issue with UIPageViewController gesture
body: <p>I am using Erica Sudan's tutorial to show a PDF via UIPageViewController , but there is 2 problems :</p>
  
  <p>1- I can not swipe the book from every corner or every position (the right or left side of the view)
  I am using apple WWDC 2011 code to swipe from everywhere but does not work :</p>
  
  <pre><code>- (void)viewDidAppear:(BOOL)animated {
  
      [[[self parentViewController] view] setGestureRecognizers:[self.view gestureRecognizers]];
  
  }
  
  - (void)viewWillDisappear:(BOOL)animated {
  
      for (UIGestureRecognizer *gesture in [self gestureRecognizers] ) {
  
          [[[self parentViewController] view] setGestureRecognizers:[self.view gestureRecognizers]];
      }
  }
  </code></pre>
  
  <p>2- It takes a little bit time to recognize the swiping , I mean page curling is not realtime with sliding . I slide left and it takes time to page move with my finger</p>
  
  <p>Thanks</p>