// 创建打印渲染

let printPageRenderer:PDFRender = PDFRender()

// 获取渲染格式

let viewFormatter:UIViewPrintFormatter = webView.viewPrintFormatter()

// 设置渲染格式

printPageRenderer.addPrintFormatter(viewFormatter, startingAtPageAt: 0)

// 将HTML渲染为PDF

let pdfData:NSData = printPageRenderer.drawPDF()

// 输出文件

let pdfFilename:String = "\(NSHomeDirectory())/Documents/test.pdf"

// 保存

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

// 获取文件的保存位置

let url = URL.init(fileURLWithPath: pdfFilename)

import UIKit

class PDFRender: UIPrintPageRenderer {

    // A4纸大小 595*842

    let pageFrame:CGRect = CGRect(x: 0.0, y: 0.0, width: 595, height: 842) 

    override init() {

        super.init()

        // 设置打印纸的尺寸大小

        self.setValue(pageFrame, forKey: "paperRect")

        // 设置内容区域大小

        self.setValue(pageFrame, forKey: "printableRect")

    }

    /// 绘制PDF并生成NSData

    func drawPDF() -> NSData! {

        let data:NSMutableData = NSMutableData()

        // 小心！第二个参数如果设置为CGRect.zero，PDF尺寸就会是默认的 612*792

        UIGraphicsBeginPDFContextToData(data, pageFrame, nil)

        self.prepare(forDrawingPages: NSRange.init(location: 0, length: self.numberOfPages))

        let bounds:CGRect = pageFrame

        for i in 0..<self.numberOfPages{

            UIGraphicsBeginPDFPage()

            self.drawPage(at: i, in: bounds)

        }

        UIGraphicsEndPDFContext()

        return data

    }

}