Grid like arrangements in UIScrollView(PhotoScroller)

Question

  Hi all,
I was using apple's scrollview sample code (PhotoScroller - https://developer.apple.com/library/ios/#samplecode/PhotoScroller/Introduction/I ntro.html) for my app using numerous images (and by recycling logic) in UIScrollView. I implemented that in my app and it works fine.
Now Im working in an app similar to the above, but with the difference, loading images in grid like view. When I happen to use the same sample code, every thing works fine except the recycling logic.
I think there is some problem with my frame set which don't tell the xcode, the visible region.
Please some one temme how to set the visible set for the grid View structure for scrollview? The code I use is,
Quote: 
  CGRect visibleBounds = _scrollView.bounds;
//    CGRect gridElementvisibleBounds = CGRectMake(0, 0, 212, 200);
int firstNeededPageIndex = floorf(CGRectGetMinX(visibleBounds) - CGRectGetWidth(visibleBounds));
int lastNeededPageIndex  = floorf((CGRectGetMaxX(visibleBounds)-1) - CGRectGetWidth(visibleBounds));
firstNeededPageIndex = MAX(firstNeededPageIndex, 0);
lastNeededPageIndex  = MIN(lastNeededPageIndex, [self imageCount] - 1); 
where _scrollView is the UIScrollView instance that I use and the gridElement that I use is of frame size (0, 0, 212, 200). The number of grid elements that occupy the scrollView bounds is
3 x 3 (9).
Please some one help me finding out the thing that I should correct in the above code.

Answer 1

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