iOS Question vkwebview and user auth

#if ObjC
@end

@interface B4IWKWebViewDelegate:NSObject <WKNavigationDelegate, WKUIDelegate>
@end

@implementation B4IWKWebViewDelegate (new)
    - (void)webView:(WKWebView *)webView
        didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
        completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler{
        B4IArray* B4ICred = [B4IObjectWrapper raiseEvent:webView :@"_userandpasswordrequired:" :@[webView.URL.absoluteString]];
        NSArray* Cred = B4ICred.objectsData;
        NSURLCredential *UrlCred = [NSURLCredential credentialWithUser:Cred[0] password:Cred[1] persistence:NSURLCredentialPersistenceForSession];
        completionHandler(NSURLSessionAuthChallengeUseCredential,UrlCred);
    }
#End If

Sub WKWebView1_UserAndPasswordRequired (Url As String) As String()
    Return Array As String("user", "pass")
End Sub