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    <p>I have build such kind of application using approximatively the same approach except :</p> <ul> <li>I cache the generated image on the disk and always generate two to three images in advance in a separate thread.</li> <li>I don't overlay with a <code>UIImage</code> but instead draw the image in the layer when zooming is 1. Those tiles will be released automatically when memory warnings are issued.</li> </ul> <p>Whenever the user start zooming, I acquire the <code>CGPDFPage</code> and render it using the appropriate CTM. The code in <code>- (void)drawLayer: (CALayer*)layer inContext: (CGContextRef) context</code> is like :</p> <pre><code>CGAffineTransform currentCTM = CGContextGetCTM(context); if (currentCTM.a == 1.0 &amp;&amp; baseImage) { //Calculate ideal scale CGFloat scaleForWidth = baseImage.size.width/self.bounds.size.width; CGFloat scaleForHeight = baseImage.size.height/self.bounds.size.height; CGFloat imageScaleFactor = MAX(scaleForWidth, scaleForHeight); CGSize imageSize = CGSizeMake(baseImage.size.width/imageScaleFactor, baseImage.size.height/imageScaleFactor); CGRect imageRect = CGRectMake((self.bounds.size.width-imageSize.width)/2, (self.bounds.size.height-imageSize.height)/2, imageSize.width, imageSize.height); CGContextDrawImage(context, imageRect, [baseImage CGImage]); } else { @synchronized(issue) { CGPDFPageRef pdfPage = CGPDFDocumentGetPage(issue.pdfDoc, pageIndex+1); pdfToPageTransform = CGPDFPageGetDrawingTransform(pdfPage, kCGPDFMediaBox, layer.bounds, 0, true); CGContextConcatCTM(context, pdfToPageTransform); CGContextDrawPDFPage(context, pdfPage); } } </code></pre> <p>issue is the object containg the <code>CGPDFDocumentRef</code>. I synchronize the part where I access the <code>pdfDoc</code> property because I release it and recreate it when receiving memoryWarnings. It seems that the <code>CGPDFDocumentRef</code> object do some internal caching that I did not find how to get rid of.</p>
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    1. COwhats your approach when the user starts Zooming?
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      1. USLuke Mcneice
    2. CO@Luke : I've modified the post to answer
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    3. COThanks alot for this, and the tip about the CGPDFDocumentRef caching.
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