How to fix missing blocks or “tiles” when programmically taking a screenshot on an iOS device? [closed]

Question

I have a problem that I can't seem to fix. I am trying to take a screen-shot of a UIScrollView (including off-screen content) but when the view is long the renderInContext doesn't get all the contents of the scroll view.

The produced image dimensions are correct but the rendered data appears to be missing chunks (or Tiles) of the display leaving white space where those chunks should be. The missing blocks are from the content in a UIWebView, which I believe extends UIWebTileView and could explain the missing tiles or blocks?

It doesn't happen everytime, it appears to only happen when the UIWebView's height is fairly large.

Here is the code that I am using:

UIGraphicsBeginImageContext(scrollView.contentSize);
{
    CGPoint savedContentOffset = scrollView.contentOffset;
    CGRect savedFrame = scrollView.frame;


    //hide the scroll bars
    [scrollView setShowsHorizontalScrollIndicator:NO];
    [scrollView setShowsVerticalScrollIndicator:NO];


    scrollView.contentOffset = CGPointZero;
    scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
    //adjust layer for cut-off
    CALayer *coreLayer = scrollView.layer;
    coreLayer.bounds = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
    [coreLayer renderInContext: UIGraphicsGetCurrentContext()]; 
    //[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
    image = UIGraphicsGetImageFromCurrentImageContext();

    scrollView.contentOffset = savedContentOffset;
    scrollView.frame = savedFrame;


    //reset the scroll bars to default
    [scrollView setShowsHorizontalScrollIndicator:YES];
    [scrollView setShowsVerticalScrollIndicator:YES];
}
UIGraphicsEndImageContext();

Has anyone ever experienced this issue before? How would I go about fixing it? Should I try to get the UIWebView's layer and and get the graphics from that?

Any help would be greatly appreciated!

Thanks!