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ThumbNail of PDF


-(void)thumbnailOfPDF{

    NSURL* pdfFileUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"test" ofType:@"pdf"]];
    CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL((CFURLRef)CFBridgingRetain(pdfFileUrl));
    CGPDFPageRef page;
    
    CGRect aRect = CGRectMake(0, 0, 70, 100); // thumbnail size
    UIGraphicsBeginImageContext(aRect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    UIImage* thumbnailImage;
    
    
    NSUInteger totalNum = CGPDFDocumentGetNumberOfPages(pdf);
    
    [self.thumbScrollView setContentSize:CGSizeMake(self.thumbScrollView.frame.size.width, totalNum*100)];
    for(int i = 0; i < totalNum; i++ ) {
        
        
        UIImageView *showThumbnail = [[UIImageView alloc]initWithFrame:CGRectMake(0, 100*i, 80, 80)];
        [showThumbnail setBackgroundColor:[UIColor redColor]];
        
        //Add the thumb Image on the ScrollView
        [self.thumbScrollView addSubview:showThumbnail];
        
        
        CGContextSaveGState(context);
        CGContextTranslateCTM(context, 0.0, aRect.size.height);
        CGContextScaleCTM(context, 1.0, -1.0);
        
        CGContextSetGrayFillColor(context, 1.0, 1.0);
        CGContextFillRect(context, aRect);
        
        
        // Grab the first PDF page
        page = CGPDFDocumentGetPage(pdf, i + 1);
        CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, aRect, 0, true);
        // And apply the transform.
        CGContextConcatCTM(context, pdfTransform);
        
        CGContextDrawPDFPage(context, page);
        
        // Create the new UIImage from the context
        thumbnailImage = UIGraphicsGetImageFromCurrentImageContext();
        
        [showThumbnail setImage:thumbnailImage];
        //Use thumbnailImage (e.g. drawing, saving it to a file, etc)
        
        CGContextRestoreGState(context);
        
    }
    
    
    UIGraphicsEndImageContext();
    CGPDFDocumentRelease(pdf);
}

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