swift draw image on pdf

swift_draw_image_on_pdf.swift

    func drawOnPDF(path: String) {
        
        // Get existing Pdf reference
        let pdf = CGPDFDocumentCreateWithURL(NSURL(fileURLWithPath: path))
        
        // Get page count of pdf, so we can loop through pages and draw them accordingly
        let pageCount = CGPDFDocumentGetNumberOfPages(pdf);
        
        // Write to file
        UIGraphicsBeginPDFContextToFile(path, CGRectZero, nil)
        
        // Write to data
        //var data = NSMutableData()
        //UIGraphicsBeginPDFContextToData(data, CGRectZero, nil)
        
        for index in 1...pageCount {
            let page = CGPDFDocumentGetPage(pdf, index)
            let pageFrame = CGPDFPageGetBoxRect(page, kCGPDFMediaBox)
                    
            UIGraphicsBeginPDFPageWithInfo(pageFrame, nil)
                    
            var ctx = UIGraphicsGetCurrentContext()
            
            // Draw existing page
            CGContextSaveGState(ctx);
            CGContextScaleCTM(ctx, 1, -1);
            CGContextTranslateCTM(ctx, 0, -pageFrame.size.height);
            CGContextDrawPDFPage(ctx, page);
            CGContextRestoreGState(ctx);
            
            // Draw image on top of page
            var image = UIImage(named: "signature3")
            image?.drawInRect(CGRectMake(100, 100, 100, 100))
            
            // Draw red box on top of page
            //UIColor.redColor().set()
            //UIRectFill(CGRectMake(20, 20, 100, 100));
        }
        
        
        UIGraphicsEndPDFContext()
    }

Thanks :)