用于UIwebview的iOS Air打印

   var webView: WKWebView!

   override func loadView() {

       let webConfiguration = WKWebViewConfiguration()

       webView = WKWebView(frame: .zero, configuration: webConfiguration)

       webView.navigationDelegate = self

       view = webView

   }

   override func viewDidLoad() {

       super.viewDidLoad()

       if let url = Bundle.main.url(forResource: "index", withExtension: "html", subdirectory: "www") {

           let request = URLRequest(url: url)

           webView.load(request)

       }

   }

   let printInfo = UIPrintInfo(dictionary: nil)

   printInfo.printer = UIPrintPrinter(dictionary: nil)

   if let url = webView.url {

       let request = URLRequest(url: url)

       request.setValue("1", forHTTPHeaderField: "X-UP-Printing-Option")

       request.setValue("https://www.example.com", forHTTPHeaderField: "Host")

       webView.load(request)

   }