Problem with ebook reader application

[tariq2305]

I am working on a ebook reader application... i can able to work exactly as iBooks application does.
I have used :

CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("paper.pdf"), NULL, NULL);
pdf = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);
CFRelease(pdfURL);

- (void) renderPageAtIndexNSUInteger)index inContextCGContextRef)ctx {
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, index + 1);
CGAffineTransform transform = aspectFit(CGPDFPageGetBoxRect(page, kCGPDFMediaBox),
CGContextGetClipBoundingBox(ctx));
CGContextConcatCTM(ctx, transform);
CGContextDrawPDFPage(ctx, page);
}


But the problem how can i adjust font or text color ? I am unable to locate any method or delegate which can change the property.

Please Advice.