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copied!<p>I found the solution.</p> <p>The problem was when you create a <code>UIScrollView</code> programmatically it sets <code>minimumZoomScale</code> and <code>maximumZoomScale</code> 1.0 by default. So actually my code was working but I didn't know that it was working because it wasn't zooming in or zooming out.</p> <p>So I added two lines to my code and it worked !!! Here is the changes in my code</p> <pre><code>PDFScrollView *pageViewer = [[PDFScrollView alloc] initWithFrame:frame]; pageViewer.minimumZoomScale = 0.2; pageViewer.maximumZoomScale = 5.0; [self.scrollviewer addSubview:pageViewer]; </code></pre> <p>When I inserted two lines it worked but I was able to zoom in or zoom out infinitely. I wanted to zoom at max scale of 5. So I changed <code>scrollViewDidEndZooming</code> method given in the file <code>PDFScrollView.m</code></p> <p>Default code shipped with Apple's <code>ZoomingPDFViewer</code> looks like this:</p> <pre><code>// Set the new scale factor for the TiledPDFView. _PDFScale *= scale; // Calculate the new frame for the new TiledPDFView. CGRect pageRect = CGPDFPageGetBoxRect(_PDFPage, kCGPDFMediaBox); pageRect.size = CGSizeMake(pageRect.size.width*_PDFScale, pageRect.size.height*_PDFScale); </code></pre> <p>After changes it looks like:</p> <pre><code>// Set the new scale factor for the TiledPDFView. _PDFScale *= scale; self.minimumZoomScale *= 1 / scale; self.maximumZoomScale *= 1 / scale; // Calculate the new frame for the new TiledPDFView. CGRect pageRect = CGPDFPageGetBoxRect(_PDFPage, kCGPDFMediaBox); pageRect.size = CGSizeMake(pageRect.size.width*_PDFScale, pageRect.size.height*_PDFScale); </code></pre> <p>Now it works.</p>

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