如何在swift 4中从WKWebView中的网页中删除DIV标签？

Question

在 swift 4 中将网页加载到 WKWebVIew 时，我想从网页中删除页眉和页脚 div 标签。 我已经尝试了以下代码。但它不工作.. 给我解决方案！

class ViewController: UIViewController {

   @IBOutlet var webView: WKWebView!

   override func viewDidLoad() {
      super.viewDidLoad()

      var url: URL?
      url = URL(string: "https://www.walkmate.co.in")
      let request = URLRequest(url: url!)
      webView.load(request)
      let script="function(){ var footer=document.getElementsByClassName('footer-env')[0]; footer.parentNode.removeChild(footer); })())"

      webView.evaluateJavaScript(script) { (result, error) in
         if error != nil {
            print(result)
         }
      }

   }

   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
   }
}

Answer 1

我认为你应该等待网站加载完毕。

您需要 WKNavigationDelegate 并在

中评估您的脚本

func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
   print("Finished navigating to url \(webView.url)");
}

实际上，当您要评估脚本时，您的网站并未加载。

** 更新**

你需要这样的东西

// add the protocol
class ViewController: UIViewController, WKNavigationDelegate {

   @IBOutlet var webView: WKWebView!

   override func viewDidLoad() {
      super.viewDidLoad()

      var url: URL?
      url = URL(string: "https://www.walkmate.co.in")
      let request = URLRequest(url: url!)

      webView.navigationDelegate = self // set the delegate

      webView.load(request)

   }

   func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
      print("Finished navigating to url \(webView.url)");

      let script="function(){ var footer=document.getElementsByClassName('footer-env')[0]; footer.parentNode.removeChild(footer); })())"

      webView.evaluateJavaScript(script) { (result, error) in
         if error != nil {
            print(result)
         }
      }
   }

   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
   }
}