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PODraw content on existing PDF Document in specific Page
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  1. PODraw content on existing PDF Document in specific Page
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    copied!<p>So I am implementing a specific type of PDF editor for the iPad, for personal use. I have already implemented the PDF viewer, and now i am stuck in the editing part. Here is the deal: I display each page of the document in a UIView, and then create another view, with the exact same size of the page inside it. I then let the user draw on the view</p> <p>Now, say i want to print that UIVIiew in the exact page of the PDF file it was drawn. I am aware of a way to do this, but it is taking too long for bigger documents. I was doing it like this (simplified the code for better understanding):</p> <pre><code>UIGraphicsBeginPDFContextToFile(file, pageSize, nil); for (size_t currentPage = 1; currentPage &lt;= pageCount; currentPage++) { UIGraphicsBeginPDFPageWithInfo(pageSize, nil); CGContextRef ctx = UIGraphicsGetCurrentContext(); //translates context, copies doc page to the new pdf, translates back CGContextTranslateCTM(ctx, 0, pageSize.size.height); CGContextScaleCTM(ctx, 1.0, -1.0); CGPDFPageRef page = CGPDFDocumentGetPage (document, currentPage); CGContextDrawPDFPage (ctx, page); CGContextScaleCTM(ctx, 1.0, -1.0); CGContextTranslateCTM(ctx, 0, -pageSize.size.height); //custom drawing goes here if(currentPage == desiredPage) [imageFromView drawInRect:pageSize]; } UIGraphicsEndPDFContext(); </code></pre> <p>The problem here is that this procedure recreates the entire PDF, and for larger documents, this can take minutes to finish.</p> <p>I needed a solution that prints the UIView (that the user drew on) in a page of the PDF document, without having to recreate the whole document.</p> <p>Any links, tips and other useful information are very appreciated. Thanks in advance</p>
 

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