Get a PDF/PNG as output from a UIWebView or UIView

Question

Is there any way to get the content of a UIWebView and convert it to a PDF or PNG file? I'd like to get similar output to that available on the Mac by selecting the PDF button when printing from Safari, for example. I'm assuming this isn't possible/built in yet, but hopefully I'll be surprised and find a way to get the content from a webview to a file.

Thanks!

Answer 1

Creating a image from a web view is simple:

UIImage* image = nil;

UIGraphicsBeginImageContext(offscreenWebView_.frame.size);
{
    [offscreenWebView_.layer renderInContext: UIGraphicsGetCurrentContext()];
    image = UIGraphicsGetImageFromCurrentImageContext();
}
UIGraphicsEndImageContext();

Once you have the image you can save it as a PNG.

Creating PDFs is also possible in a very similar way, but only on a yet unreleased iPhone OS version.

Answer 2

You can use the following category on UIView to create a PDF file:

#import <QuartzCore/QuartzCore.h>

@implementation UIView(PDFWritingAdditions)

- (void)renderInPDFFile:(NSString*)path
{
    CGRect mediaBox = self.bounds;
    CGContextRef ctx = CGPDFContextCreateWithURL((CFURLRef)[NSURL fileURLWithPath:path], &mediaBox, NULL);

    CGPDFContextBeginPage(ctx, NULL);
    CGContextScaleCTM(ctx, 1, -1);
    CGContextTranslateCTM(ctx, 0, -mediaBox.size.height);
    [self.layer renderInContext:ctx];
    CGPDFContextEndPage(ctx);
    CFRelease(ctx);
}

@end

Bad news: UIWebView does not create nice shapes and text in the PDF, but renders itself as an image into the PDF.

Answer 3

@mjdth, try fileURLWithPath:isDirectory: instead. URLWithString wasn't working for me either.

@implementation UIView(PDFWritingAdditions)

- (void)renderInPDFFile:(NSString*)path
{
    CGRect mediaBox = self.bounds;
    CGContextRef ctx = CGPDFContextCreateWithURL((CFURLRef)[NSURL fileURLWithPath:path isDirectory:NO], &mediaBox, NULL);

    CGPDFContextBeginPage(ctx, NULL);
    CGContextScaleCTM(ctx, 1, -1);
    CGContextTranslateCTM(ctx, 0, -mediaBox.size.height);
    [self.layer renderInContext:ctx];
    CGPDFContextEndPage(ctx);
    CFRelease(ctx);
}

@end