I'm trying to write a simple PDF viewer using CGPDFDocument, based on QuartzDemo.
There is common rendering:

    // PDF page drawing expects a Lower-Left coordinate system, 
    // so we flip the coordinate system before we start drawing.
    CGContextTranslateCTM(context, 0.0, self.bounds.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    // Grab the first PDF page
    CGPDFPageRef page = CGPDFDocumentGetPage(pdf, pageNumber);
    // We're about to modify the context CTM to draw the PDF page
    //  where we want it, so save the graphics state 
    // in case we want to do more drawing
    // CGPDFPageGetDrawingTransform provides an easy way to get the
    // transform for a PDF page. It will scale down to fit, including any 
    // base rotations necessary to display the PDF page correctly. 
    CGAffineTransform pdfTransform = 
                    kCGPDFCropBox, self.bounds, 0, true);
    // And apply the transform.
    CGContextConcatCTM(context, pdfTransform);
    // Finally, we draw the page 
    // and restore the graphics state for further manipulations!
    CGContextDrawPDFPage(context, page);
As I understand, its only drawing, so all structure navigation or outgoing links should be handled manually (ex. in touch event).

There are functions which will set URL or create element with URL.

Question is: how to get outgoing link URL from certain PDF block?

Thank you!