title: How can I detect next page number of UIScrollView which is 'scrollView.pagingEnabled' = YES? in 'scrollViewDidEndDragging'?
body: <p>I searched several stuffs on stackoverflow like</p>
  <pre><code>CGFloat pageWidth = scrollView.frame.size.width;
  int pageNumberToBeScrolled = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
  if (pageNumberToBeScrolled != 1) {
      // Do what I want
  }
  </code></pre>
  <p>in</p>
  <pre><code>- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
  </code></pre>
  <p>But this works only if I scrolled slowly so scrolling page is definitely moved over half of it. This doesn't work if I scrolled fast like swipe. I just scrolled like 30% of scrolling page, which doesn't satisfy the situation over there, but it scrolled to next page, and I want to detect it.</p>
  <p>How can I detect or catch all <code>scroll-to-next-page</code> situations? Please give me some help :)</p>
  <h1>EDIT</h1>
  <p>I working on this because I want to play a effect sound when scroll-to-next-page happens. I should detect right after my finger is off the screen and only for next page scrolling. I think if I handle this on <code>scrollViewDidEndDragging</code>, it'll be best for me :)</p>