无法在Swift中生成多页PDF

我有一个html文件,其中包含静态和动态数据,我需要从该html文件生成PDF文件.我能够创建PDF文件,但它只打印第一页.我需要一个三页的PDF文件.我使用了以下两个函数来绘制和保存PDF文件.我的代码是:

func exportHTMLContentToPDF(HTMLContent: String) {

    let printFormatter = UIMarkupTextPrintFormatter(markupText: HTMLContent)

    let printPageRenderer = CustomPrintPageRenderer()

    printPageRenderer.addPrintFormatter(printFormatter, startingAtPageAt: 0)

    let pdfData = drawPDFUsingPrintPageRenderer(printPageRenderer: printPageRenderer)

    pdfFilename = "\(AppDelegate.getAppDelegate().getDocDir())/FinalPdf.pdf"

    pdfData?.write(toFile: pdfFilename, atomically: true)

    print(pdfFilename)

}

func drawPDFUsingPrintPageRenderer(printPageRenderer: UIPrintPageRenderer) -> NSData! {

    let data = NSMutableData()

    UIGraphicsBeginPDFContextToData(data, CGRect.zero, nil)

    UIGraphicsBeginPDFPage()

    printPageRenderer.drawPage(at: 0, in: UIGraphicsGetPDFContextBounds())

    UIGraphicsEndPDFContext()

    return data

}

我已经关注了app coda教程.对于多个页面,它表示包括PDF页面创建的开头和打印页面渲染器绘制到循环中.请帮我创建多页PDF.

使用下面的代码代替您当前的drawPDFUsingPrintPageRenderer函数:

func drawPDFUsingPrintPageRenderer(printPageRenderer: UIPrintPageRenderer) -> NSData! {
    let data = NSMutableData()

    UIGraphicsBeginPDFContextToData(data, CGRect.zero, nil)
    printPageRenderer.prepare(forDrawingPages: NSMakeRange(0, printPageRenderer.numberOfPages))

    let bounds = UIGraphicsGetPDFContextBounds()

    for i in 0...(printPageRenderer.numberOfPages - 1) {
        UIGraphicsBeginPDFPage()
        printPageRenderer.drawPage(at: i, in: bounds)
    }

    UIGraphicsEndPDFContext();
    return data
}

中提琴,多页.