Render only a portion of a PDF on iPhone/iPad

Posted by Infinity on Stack Overflow See other posts from Stack Overflow or by Infinity
Published on 2010-05-28T21:46:46Z Indexed on 2010/05/28 21:52 UTC
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Hello guys!

I am rendering my pdf in an UIView's drawRect method. Here's my code:

- (void)drawRect:(CGRect)rect2 {
NSString *filename = @"lol.pdf";

CFStringRef path = CFStringCreateWithCString (NULL, [filename UTF8String], kCFStringEncodingUTF8);
CFURLRef url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, 0);
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(url);
CGPDFPageRef page = CGPDFDocumentGetPage (pdf, 1);

CGAffineTransform m;

CGContextRef context = UIGraphicsGetCurrentContext();

CGRect aRect = CGRectMake(0, 0, 768, 1024);

CGContextTranslateCTM(context, 0.0, aRect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);

m = CGPDFPageGetDrawingTransform (page, kCGPDFMediaBox, aRect, 0, YES);
CGContextSaveGState (context);
CGContextConcatCTM (context, m);
CGContextClipToRect (context,CGPDFPageGetBoxRect (page, kCGPDFCropBox));
CGContextDrawPDFPage (context, page);
CGContextRestoreGState (context);
}

It renders the whole pdf. How can I render only a part from it? Can you help me with it?

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