问用于iOS的PDF实用程序

EN

    UIGraphicsBeginImageContextWithOptions(pageRect.size, NO, 0.0);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSaveGState(context);
    // Flip the context so that the PDF page is rendered
    // right side up.
    CGContextTranslateCTM(context, 0.0, pageRect.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    // Scale the context so that the PDF page is rendered 
    // at the correct size for the zoom level.
    CGContextScaleCTM(context, pdfScale, pdfScale); 
    CGContextTranslateCTM(context, -pageRect.origin.x, -pageRect.origin.y);
    CGContextDrawPDFPage(context, pdfPage);
    CGContextRestoreGState(context);

    // callback for custom overlay drawing (example_
    if ([document shouldDrawOverlayRectForSize:size]) {
        [document drawOverlayRect:pageRect inContext:context forPage:page zoomScale:1.0 size:size];    
    }