在Safari中打开WKWebview target =“ _ blank”链接

针对iOS 10 Swift 3的代码已更新：

override func loadView() {    super.loadView()    self.webView.navigationDelegate = self     self.webView.uiDelegate = self  //must have this}func webView(_ webView: WKWebView,    createWebViewWith configuration: WKWebViewConfiguration,    for navigationAction: WKNavigationAction,    windowFeatures: WKWindowFeatures) -> WKWebView? {    if navigationAction.targetframe == nil, let url = navigationAction.request.url {      if url.description.lowercased().range(of: "http://") != nil ||        url.description.lowercased().range(of: "https://") != nil ||        url.description.lowercased().range(of: "mailto:") != nil {        UIApplication.shared.openURL(url)      }    }  return nil}