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// assign the print formatter to the print page renderer     let renderer = UIPrintPageRenderer()     renderer.addPrintFormatter(printFormatter, startingAtPageAt: 0)     // assign paperRect and printableRect values     let page = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4, 72 dpi     renderer.setValue(page, forKey: "paperRect")     renderer.setValue(page, forKey: "printableRect")     // create pdf context and draw each page     let pdfData = NSMutableData()     UIGraphicsBeginPDFContextToData(pdfData, .zero, nil)     for i in 0..<renderer.numberOfPages {       UIGraphicsBeginPDFPage()       renderer.drawPage(at: i, in: UIGraphicsGetPDFContextBounds())     }     UIGraphicsEndPDFContext();     // save data to a pdf file and return     guard nil != (try? pdfData.write(to: outputURL, options: .atomic))       else { fatalError("Error writing PDF data to file.") }     return pdfData as Data   }