title: My App calls scrollViewDidScroll 19 times
body: <p>I have an app based on Apple's PageControl sample. The first time the view loads, the scroll view is loaded with page 0 and page 1. Whenever a scroll is initiated, the scrollViewDidScroll method should get called by UIKit correct?</p>
  
  <p>When initiating a scroll from page 0 to page 1, the app should load page-1, page and page+1, (to prevent flashes during scrolling).</p>
  
  <p>My app seems to call <code>scrollViewDidScroll</code> 19 times and my <code>loadScrollViewWithPage:</code> method 19 times each with page 0 and page 1, before it finally gets to page 1 and 2, then it crashes.</p>
  
  <p>These are the methods:</p>
  
  <pre><code>- (void)scrollViewDidScroll:(UIScrollView *)sender {
      NSLog(@"scrollviewdidscroll");
     // We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
     // which a scroll event generated from the user hitting the page control triggers updates from
     // the delegate method. We use a boolean to disable the delegate logic when the page control is used.
     if (pageControlUsed) {
          // do nothing - the scroll was initiated from the page control, not the user dragging
         return;
     }
  
     // Switch the indicator when more than 50% of the previous/next page is visible
     CGFloat pageWidth = scrollView.frame.size.width;
     int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
     pageControl.currentPage = page;
  
     // load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
     [self loadScrollViewWithPage:page - 1];
     [self loadScrollViewWithPage:page];
     [self loadScrollViewWithPage:page + 1];
  
     // A possible optimization would be to unload the views+controllers which are no longer visible
  }
  
  - (void)loadScrollViewWithPage:(int)page {
      if (page &lt; 0) return;
      if (page &gt;= kNumberOfPages) return;
  
      NSLog(@"page: %i", page);
  
      // replace the placeholder if necessary
      KeyboardViewController *controller = [viewControllers objectAtIndex:page];
      if ((NSNull *)controller == [NSNull null]) {
          controller = [[KeyboardViewController alloc] initWithPageNumber:page];
          [viewControllers replaceObjectAtIndex:page withObject:controller];
          [controller release];
      }
  
      // add the controller's view to the scroll view
      CGRect frame = scrollView.frame;
      frame.origin.x = frame.size.width * page;
      frame.origin.y = 0;
      frame.size.height = scrollView.frame.size.height;
      controller.view.frame = frame;
      [scrollView setAutoresizesSubviews:YES];
      [scrollView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
      [scrollView addSubview:controller.view];
  }
  </code></pre>
  
  <p>Why would scrollViewDidScroll get called so many times?</p>
  
  <p>Thanks</p>