How to draw text in PDF context - ios

Question

What's a right way to draw text in a PDF file? First, I tried:
NSString* string = #"Some Text";
const char* chstr = [string UTF8String];
CGContextRef pdfContext = CGPDFContextCreate(pdfConsumer, &pdfPageRect, NULL);
...
CGContextShowTextAtPoint(pdfContext, x, y, chstr, strlen(chstr));
...
CGContextRelease(pdfContext);
This worked but did not show unicode text correctly. Also the API CGContextShowTextAtPoint has been deprecated in iOS7. So I tried:
NSDictionary *textAttributes = #{NSFontAttributeName: [UIFont systemFontOfSize:8.0]};
...
UIGraphicsPushContext(pdfContext);
[string drawAtPoint:CGPointMake(x, y) withAttributes:textAttributes];
UIGraphicsPopContext();
...
CGContextRelease(pdfContext);
As suggested by some SO posts. But the app crashes on CGContextRelease(pdfContext). If I remove CGContextRelease(pdfContext), it does not draw anything in PDF. Am I missing anything?
** Additional information **
I figured out the crash in CGContextRelease happens only when NSString contains unicode text and here is the image of the call stack at the time of the crash. I even moved the test code of PDF generation in [AppDelegate didFinishLaunchingWithOptions] but it still crashes.

Answer 1

You can try this! I have test it and it work.
//Ready to begin
UIGraphicsBeginPDFContextToFile(tempPath, CGRectZero, nil);
CGPDFPageRef page = CGPDFDocumentGetPage (doc, i);
//grab page i of the PDF
CGRect bounds = [ReaderDocument boundsForPDFPage:page];
//Create a new page
UIGraphicsBeginPDFPageWithInfo(bounds, nil);
CGContextRef context = UIGraphicsGetCurrentContext();
// flip context so page is right way up
CGContextTranslateCTM(context, 0, bounds.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawPDFPage (context, page); // draw the page into graphics context
//Flip back right-side up
CGContextScaleCTM(context, 1.0, -1.0);
CGContextTranslateCTM(context, 0, -bounds.size.height);
//Draw text
UIGraphicsPushContext(context);
CGContextSetTextMatrix(context, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));
CGContextSetTextDrawingMode(context, kCGTextFill); // This is the default
CGContextSetFillColorWithColor(context, [[UIColor blackColor] CGColor]);
CGRect newTextFrame = CGRectMake(100,100,100,30);
[#"Your Text......" drawInRect:newTextFrame withAttributes:#{NSFontAttributeName:self.font}];
UIGraphicsPopContext();
UIGraphicsEndPDFContext();
CGPDFDocumentRelease(doc);