在没有网络时在网页中执行操作时关闭 WKWebview

Question

我正在 WKWebView 中加载注册表单，当用户填写注册表单并点击“注册”按钮时，它将转到“注册成功”页面。

如果用户在点击“注册”按钮时失去网络连接，如何捕获无网络错误？

如果在加载注册表单之前用户未连接到网络，则以下代码有效：

func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
        if(error.localizedDescription == "The Internet connection appears to be offline.") {
               print("Network error")
               self.presentingViewController?.dismiss(animated: true, completion: {
               let alert = UIAlertController(title: "No Network", message: "No network, please check your internet connection and try again.", preferredStyle: .alert)
                   alert.addAction(UIAlertAction(title: "OK".localisedString(), style: .default, handler: nil))
                   let topC = AppConstants.getRootController().topMostViewController()
               topC.present(alert, animated: true, completion: nil)
               })
           }
        }

Answer 1

您首先关闭了当前的 ViewController，然后您正在尝试穿鞋 UIAlertController，也许这就是它不起作用的原因，否则您的代码是正确的

尝试先显示 alert 然后关闭当前 ViewController 如下所示

func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
   if(error.localizedDescription == "The Internet connection appears to be offline.")
   {
    print("Network error")
    let alert = UIAlertController(title: "No Network", message: "No network, please check your internet connection and try again.", preferredStyle: .alert)
    let ok = UIAlertAction(title: "OK", style: .default) { ( _ ) in
    let topC = self.storyboard!.instantiateViewController(withIdentifier: "cal") as! cal
    self.present(topC, animated: true, completion: nil)
   }

alert.addAction(ok)
self.present(alert, animated: true) {
self.presentingViewController?.dismiss(animated: true, completion: nil)
  }
 }
}

试试这个代码，这会起作用（代码中缺少的内容如下）
1. ok AlertAction 未添加到 alert AlertViewController
2. topC 已初始化，但未在 ok 操作中显示。

在没有网络时在网页中执行操作时关闭 WKWebview

Dismiss WKWebview when there is no network on performing an action in a web page

ios

swift4

wkwebview