renderer.writePDF doesn't work without error

Question

I learn swift and faced with problem: when i try write pdf file in document directory nothing happened. Code:

func createPDF() {
        // MARK: - create path
        let documentDir = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
        let path = documentDir.appendingPathComponent("\(clientCompanyName + UUID().uuidString).pdf")

        // MARK: - create meta
        let pdfMetaData = [
            kCGPDFContextCreator: "something",
            kCGPDFContextAuthor: "https://bla-bla.com"
        ]
        let format = UIGraphicsPDFRendererFormat()
        format.documentInfo = pdfMetaData as [String: Any]
        
        // MARK: - set page size
        let pageWidth = 8.5 * 72.0
        let pageHeight = 11 * 72.0
        let pageRect = CGRect(x: 0, y: 0, width: pageWidth, height: pageHeight)
        
        // MARK: - render
        let renderer = UIGraphicsPDFRenderer(bounds: pageRect, format: format)
        try? renderer.writePDF(to: path) { (context) in
            let attributes = [
                NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 72)
            ]
            let text = clientCompanyName + " " + formattedDate
            text.draw(at: CGPoint(x: 0, y: 0), withAttributes: attributes)
        }
    }

When i start this code, i don't see any errors in terminal. But if i open Files, my document didn't save

Answer 1

So I think the problem was that you were not allowed to write to the cachesDirectory. So replace everything with that, it should work. Also with with pageDatas you are now able to print in CGRects on multiple pages, just append the array, you're welcome:)

    func createPDF() -> URL {
            // MARK: - create path
        let documentDir = FileManager.default.temporaryDirectory
            let path = documentDir.appendingPathComponent("\("clientCompanyName" + UUID().uuidString).pdf")
        
            // MARK: - create meta
            let pdfMetaData = [
                kCGPDFContextCreator: "something",
                kCGPDFContextAuthor: "https://bla-bla.com"
            ]
        let format = UIGraphicsPDFRendererFormat()
        format.documentInfo = pdfMetaData as [String: Any]
        
        // MARK: - set page size
        let pageWidth = 8.5 * 72.0
        let pageHeight = 11 * 72.0
        let pageRect = CGRect(x: 0, y: 0, width: pageWidth, height: pageHeight)
        
        // MARK: - render
        let renderer = UIGraphicsPDFRenderer(bounds: pageRect, format: format)
        let attributes = [
                NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 72)
            ]
        let text = "clientCompanyName" + " " + "formattedDate"
        let myAttributedString = NSAttributedString(string: text, attributes: attributes)
        let pageDatas = [[[pageRect, myAttributedString]]]
        let pdfData = createCustomPdfDataa(renderer: renderer, pageDatas: pageDatas)
        do {
            try pdfData.write(to: path)
        } catch {
            fatalError("Sorry this does not work, because \(error)")
        }
        return path
    }

    func createCustomPdfDataa(renderer: UIGraphicsPDFRenderer, pageDatas: [[[Any?]]]) -> Data {
        // render context to pdfData
        let data = renderer.pdfData { (context) in
            // create pages
            for pageNumber in 0..<pageDatas.count {
                context.beginPage()
                let pageData = pageDatas[pageNumber]
                for textIndex in 0..<pageData.count {
                    drawAttributedText(inFrame: pageData[textIndex][0] as! CGRect, pageData[textIndex][1] as! NSAttributedString)
                }
            }
        }
        return data
    }


    func drawAttributedText(inFrame: CGRect, _ text: NSAttributedString) {
        text.draw(in: inFrame)
    }
}

The createPDF function returns the url you are saving to, so call it with this code below if you want to display it in a PDFView:

    let documentDir = createPDF()
    let data = readDataFromUrl(with: documentDir)
    pdfView.document = PDFDocument(data: data)


func readDataFromUrl(with url: URL) -> Data {
    // PathUrl
    let fileURL = url
    // Read
    var readData = Data()
    do {
        readData = try Data(contentsOf: fileURL)
    } catch let jsonErr {
        print("Error read file:", jsonErr)
    }
    return readData
}