A UIImage category to create images from PDF files, useful for resolution independent UI elements.

UIImage+WithPDF.h

// Copyright Harry Jordan, 2012			http://inquisitivesoftware.com/
// Open source under the MIT license	http://www.opensource.org/licenses/MIT

#import <UIKit/UIKit.h>
#import <CoreGraphics/CoreGraphics.h>



@interface UIImage (AJKImageWithPDF)

+ (UIImage *)imageWithPDFNamed:(NSString *)pdfName;
+ (UIImage *)imageWithPDFNamed:(NSString *)pdfName scale:(CGFloat)scale;

@end

UIImage+WithPDF.m

// Copyright Harry Jordan, 2012			http://inquisitivesoftware.com/
// Open source under the MIT license	http://www.opensource.org/licenses/MIT

#import "UIImage+WithPDF.h"



@implementation UIImage (AJKImageWithPDF)

+ (UIImage *)imageWithPDFNamed:(NSString *)pdfName
{
	return [UIImage imageWithPDFNamed:pdfName scale:0];
}


+ (UIImage *)imageWithPDFNamed:(NSString *)pdfName scale:(CGFloat)scale
{
	if(!pdfName || [pdfName length] == 0)
		return nil;
	
	NSURL *imageURL = [[NSBundle mainBundle] URLForResource:pdfName withExtension:@"pdf"];
    if(!imageURL) {
		NSLog(@"Couldn't find a PDF document named: %@", pdfName);
		return nil;
	}
	
	// Load the pdf
	CGPDFDocumentRef pdfDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)imageURL);
	if(!pdfDocument) {
		NSLog(@"Couldn't load the PDF document named: %@", pdfName);
		return nil;
	}
	
	CGPDFPageRef firstPage = CGPDFDocumentGetPage(pdfDocument, 1);
	if(!firstPage) {
		NSLog(@"Couldn't find any pages for the PDF document named: %@", pdfName);
		CGPDFDocumentRelease(pdfDocument);
		return nil;
	}
	
	CGSize imageSize = CGPDFPageGetBoxRect(firstPage, kCGPDFCropBox).size;
	
	// Scale the image by the 
	if(scale < 0.00001f)
		scale = [[UIScreen mainScreen] scale];
	
	imageSize.width *= scale;
	imageSize.height *= scale;
	
	
	// Setup a graphics context to draw into
	UIGraphicsBeginImageContext(imageSize);
	CGContextRef context = UIGraphicsGetCurrentContext();
	
	// Flip the context so that the image draws the right way up
	CGContextTranslateCTM(context, 0, imageSize.height);
	CGContextScaleCTM(context, scale, -scale);
	
	// Draw the pdf into the context
	CGContextDrawPDFPage(context, firstPage);
	
	// Create an image from the context
	UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	
	CGPDFDocumentRelease(pdfDocument);
	
	return image;
}


@end