Swift 将 UITextView 文本保存为 .Pdf、.Doc 和 .Txt 文件格式并显示

我的场景是，我尝试以三种格式保存 UITextView 文本：.pdf、.doc 和 .txt。在这里，格式化选项用户可以根据警报选项进行选择。保存后需要在预览控制器中显示以进行文件共享。如何实现这一目标？

func createPDF(text:String, filename:String) {

        // 1. Create Print Formatter with input text.
        let formatter = UIMarkupTextPrintFormatter(markupText: text)

        // 2. Add formatter with pageRender
        let render = UIPrintPageRenderer()
        render.addPrintFormatter(formatter, startingAtPageAt: 0)

        // 3. Assign paperRect and printableRect
        let page = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4, 72 dpi
        let printable = page.insetBy(dx: 0, dy: 0)

        render.setValue(NSValue(cgRect: page), forKey: "paperRect")
        render.setValue(NSValue(cgRect: printable), forKey: "printableRect")

        // 4. Create PDF context and draw
        let rect = CGRect.zero

        let pdfData = NSMutableData()
        UIGraphicsBeginPDFContextToData(pdfData, rect, nil)

        for i in 1...render.numberOfPages {
            UIGraphicsBeginPDFPage();
            let bounds = UIGraphicsGetPDFContextBounds()
            render.drawPage(at: i - 1, in: bounds)
        }
        UIGraphicsEndPDFContext();

        // 5. Save PDF file
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        pdfData.write(toFile: "\(documentsPath)/\(filename).pdf", atomically: true)
        print("saved success:\(documentsPath)\(filename)")
        listFiles()
    }

尝试以下代码:)

let txtData = Data(textView.txt.utf8)
do {
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        let filePath = (documentsPath as NSString).appendingPathComponent("\(filename).pdf")
        let url = URL(fileURLWithPath: filePath)
        // pdfData created by your code above
        // txtData for ".txt"
        pdfData.write(to: url)

        let activityVC = UIActivityViewController(activityItems: [url], applicationActivities: nil)

        // Use your desired viewController here, or just use the rootViewController
        UIApplication.shared.keyWindow?.rootViewController?.presentViewController(activityVC, animated: true, completion: nil)
    } catch (let error) {
        print("\(error)")
    }