iOS -- WKWebView显示空白，报错："The certificate for this server is invalid. You might be connecting to a se

解决方法在wkUIDelegate设置

#pragma mark - wk代理(UIDelegate)

- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler{

    // 信任过期证书

    dispatch_async(dispatch_get_main_queue(), ^{

        if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {

            if(challenge.previousFailureCount==0) {

                NSURLCredential*credential = [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust];

                completionHandler(NSURLSessionAuthChallengeUseCredential, credential);

            }else{

                completionHandler(NSURLSessionAuthChallengeUseCredential,nil);

            }

        }else{

            completionHandler(NSURLSessionAuthChallengeUseCredential, nil);

        }

    });

}