Generate hi resolution pdf on ios - ios

Question

Is there any way to generate high resolution PDFs on ios that support retina display? I made a basic PDF generator but on my iPad 3 it still looks pixelated. Thank you for all kind of advices!
Update:
In my PDF file text are smooth and beautiful. But when I use code to draw this pdf i got pixelated on retina display (drawing code is in a bottom).
PDF generation:
NSString *fileName = [self.bookManager cacheBookFileForPage:i];
UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
CGContextTranslateCTM(currentContext, 0, 100);
CGContextScaleCTM(currentContext, 1.0, -1.0);
// TODO: Temporary numbers
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 768 * 2, 1024 * 2), nil);
NSString *textToDraw = #"text";
CFStringRef stringRef = (__bridge CFStringRef)textToDraw;
CTFontRef ctFont= CTFontCreateWithName(CFSTR("Arial"), 20 * 2, &CGAffineTransformIdentity);
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
(__bridge id)ctFont, (NSString *)kCTFontAttributeName,
nil];
NSAttributedString *string = [[NSAttributedString alloc] initWithString:textToDraw
attributes:attributes];
CFRelease(ctFont);
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)string);
// TODO: temporary
CGRect frameRect = CGRectMake(100, 100, 800 * 2, 50 * 2);
CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);
// Get the frame that will do the rendering.
CFRange currentRange = CFRangeMake(0, 0);
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
CGPathRelease(framePath);
// Draw the frame.
CTFrameDraw(frameRef, currentContext);
CFRelease(frameRef);
CFRelease(stringRef);
CFRelease(framesetter);
// Close the PDF context and write the contents out.
UIGraphicsEndPDFContext();
PDF Drawing:
// This will return pageRef from PDF
CGPDFPageRef page = [self.bookManager contentForPage:index + 1];
CGContextSetRGBFillColor(context, 1.0f, 1.0f, 1.0f, 1.0f);
CGContextFillRect(context, CGContextGetClipBoundingBox(context));
CGContextTranslateCTM(context, 0.0f, [self.view.layer bounds].size.height);
CGRect transformRect = CGRectMake(0, 0, [self.view.layer bounds].size.width, [self.view.layer bounds].size.height);
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, transformRect, 0, true);
// And apply the transform.
CGContextConcatCTM(context, pdfTransform);
CGContextScaleCTM(context, 1.0f, -1.0f);
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
CGContextSetRenderingIntent(context, kCGRenderingIntentDefault);
CGContextDrawPDFPage(context, page);

Answer 1

I think one of the problems you have is that you are scaling what you are drawing; don't use that transform! Just create your pdf context and draw natively in that. Your fonts will look crisp as they are now drawn in full resolution, instead of half rez and then the bitmap of that font is scaled up, which of course introduces jaggies.
tl;dr: draw directly to the pdf, don't use the scaling transform on text.