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    <p>The links are stored in the Annots array in the page dictionary. When you loop through the Annots array, you locate the link annotations by verifying the Subtype key in the annotation dictionary, it must be "Link" (name object). If you have a link annotation, you verify if it has an action stored in the A entry. If it has an action, you verify if it is a web link, the S entry in the action dictionary must have the value "URI" (name object). If you have an URI action, then you retrieve the link from the URI entry in the action dictionary.</p> <p>The annotation position on the PDF page is stored in the Rect array. These are 4 values for 2 opposite corners, usually lower left x, lower left y, upper right x, upper right y. These values are relative to bottom left corner of page's media box. These values must be transformed in view coordinates based on these variables: 1. position in the view where the page is displayed; 2. size in the view of the displayed page (current scaling factor * PDF page size); 3. page crop box; 4. page rotation.</p> <p>The conversion method looks like this:</p> <pre><code>- (CGPoint)convertPDFPointToViewPoint:(CGPoint)pdfPoint { CGPoint viewPoint = CGPointMake(0, 0); CGRect cropBox = CGPDFPageGetBoxRect(pdfPage, kCGPDFCropBox); int rotation = CGPDFPageGetRotationAngle(pdfPage); switch (rotation) { case 90: case -270: viewPoint.x = pageRenderRect.size.width * (pdfPoint.y - cropBox.origin.y) / cropBox.size.height; viewPoint.y = pageRenderRect.size.height * (pdfPoint.x - cropBox.origin.x) / cropBox.size.width; break; case 180: case -180: viewPoint.x = pageRenderRect.size.width * (cropBox.size.width - (pdfPoint.x - cropBox.origin.x)) / cropBox.size.width; viewPoint.y = pageRenderRect.size.height * (pdfPoint.y - cropBox.origin.y) / cropBox.size.height; break; case -90: case 270: viewPoint.x = pageRenderRect.size.width * (cropBox.size.height - (pdfPoint.y - cropBox.origin.y)) / cropBox.size.height; viewPoint.y = pageRenderRect.size.height * (cropBox.size.width - (pdfPoint.x - cropBox.origin.x)) / cropBox.size.width; break; case 0: default: viewPoint.x = pageRenderRect.size.width * (pdfPoint.x - cropBox.origin.x) / cropBox.size.width; viewPoint.y = pageRenderRect.size.height * (cropBox.size.height - pdfPoint.y) / cropBox.size.height; break; } viewPoint.x = viewPoint.x + pageRenderRect.origin.x; viewPoint.y = viewPoint.y + pageRenderRect.origin.y; return viewPoint; } </code></pre> <p>where the pageRenderRect is the rectangle in the view where the page is displayed. You can find additional reference source code here: <a href="http://ipdfdev.com/2011/06/21/links-navigation-in-a-pdf-document-on-iphone-and-ipad/" rel="nofollow">http://ipdfdev.com/2011/06/21/links-navigation-in-a-pdf-document-on-iphone-and-ipad/</a></p>
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    1. COI just took a look on the source code you linked to and now my positioning seems to work. Thank you veru much. Do you have an idea why my buttons are too long? I have updated my original post to sow the code.
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    2. COYour rect.size is still in PDF coordinates. You need to convert the lower left (coords[0], coords[1]) and upper right (coords[2], coords[3]) corners of the annotation rectangle to view points and build a rectangle from these 2 view points. The difference between these 2 view points will be the width and the height of your button.
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    3. COAh, yes! I see. Thank you very much. I really appreciate your help. It is now working perfectly. I have updated my original post to show my final code.
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