[iOS] wkwebview에서 팝업이 안 뜰 때

// runJavaScriptAlertPanelWithMessage
func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
     let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
       alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
           completionHandler()
       }))

       present(alertController, animated: true, completion: nil)
  }
  
  // runJavaScriptTextInputPanelWithPrompt
  func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (String?) -> Void) {
    
    let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)

    alertController.addTextField { (textField) in
        textField.text = defaultText
    }

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        if let text = alertController.textFields?.first?.text {
            completionHandler(text)
        } else {
            completionHandler(defaultText)
        }
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(nil)
    }))

    present(alertController, animated: true, completion: nil)
  }
  
  // runJavaScriptConfirmPanelWithMessage
  func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
      let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)

      alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
          completionHandler(true)
      }))

      alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
          completionHandler(false)
      }))

      present(alertController, animated: true, completion: nil)
  }

 

이런 함수들을 WKWebView에서 채택하고, 구현해줘야 웹뷰가 정상적으로 작동한다. 

ㅠ

날린 시간 돌려줘.............