WebViewCoordinator.swift

final class WebViewWrapper : UIViewRepresentable {
  ...
  final class Coordinator: NSObject {
        @ObservedObject var webViewStateModel: WebViewStateModel
        let action: ((_ navigationAction: WebView.NavigationAction) -> Void)?
        
        init(action: ((_ navigationAction: WebView.NavigationAction) -> Void)?,
             webViewStateModel: WebViewStateModel) {
            self.action = action
            self.webViewStateModel = webViewStateModel
        }
        
    }
}

extension WebViewWrapper.Coordinator: WKNavigationDelegate {
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        
        if action == nil {
            decisionHandler(.allow) //if no custom delegates always return allow 
        } else {
            action?(.decidePolicy(navigationAction, decisionHandler))
        }
    }
    
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        webViewStateModel.loading = true
        action?(.didStartProvisionalNavigation(navigation))
    }
    
    func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!) {
        action?(.didReceiveServerRedirectForProvisionalNavigation(navigation))

    }
    
    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
        webViewStateModel.loading = false
        webViewStateModel.canGoBack = webView.canGoBack
        action?(.didFailProvisionalNavigation(navigation, error))
    }
    
    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
        action?(.didCommit(navigation))
    }
    
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        webViewStateModel.loading = false
        webViewStateModel.canGoBack = webView.canGoBack
        if let title = webView.title {
            webViewStateModel.pageTitle = title
        }
        action?(.didFinish(navigation))
    }
    
    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
        webViewStateModel.loading = false
        webViewStateModel.canGoBack = webView.canGoBack
        action?(.didFail(navigation, error))
    }
    
    func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        
        if action == nil  {
            completionHandler(.performDefaultHandling, nil)
        } else {
            action?(.didRecieveAuthChallange(challenge, completionHandler))
        }
        
    }
}