Migrating UIWebView delegate to WKWebView delegate method

You might required to implement the following in your code, which means instead of using UIWebViewDelegate protocol try to use WKNavigationDelegate protocol. I guess you are missing one of the most important function when you are handling with sessions.

   func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {        print(#function)        completionHandler(.performDefaultHandling,nil)    }

There are different types of AuthChallengeDisposition , like

public enum AuthChallengeDisposition : Int {    case useCredential    case performDefaultHandling    case cancelAuthenticationChallenge    case rejectProtectionSpace}

Complete WKNavigationDelegate protocols are

  extension ViewController: WKNavigationDelegate{    func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {        print(#function)    }    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {        print(#function)    }    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {        print(#function)    }    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {        print(#function)    }    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {        print(#function)    }    func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!) {        print(#function)    }    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {        print(#function)    }    func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {        print(#function)        completionHandler(.performDefaultHandling,nil)    }    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {        print(#function)        decisionHandler(.allow)    }    func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {        print(#function)        decisionHandler(.allow)    }}

I guess you can use webView(_:decidePolicyFor:decisionHandler:) and you block/cancel or allow requests. That should work in the same way.

Disclaimer: I haven't tested that yet, I'll do so as soon as I find some time.

analyzing your code, i have found a statement that is never reached cause of "return" called before.

The statement is:

decisionHandler(.allow)

You can find it as last line of code for the function:

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (_: WKNavigationActionPolicy) -> Void)

that you have up this method:

func webViewDidStartLoad(_ webView: UIWebView) {    numberOfDidStartLoads += 1}