当我将 Xcode 更新到 7.0 或 iOS 9.0 时，我遇到了这个问题。不知何故，它开始给我标题错误

“无法加载资源，因为应用程序传输安全策略需要使用安全连接”

网络服务方法：

-(void)ServiceCall:(NSString*)ServiceName :(NSString *)DataString
{
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
    [sessionConfiguration setAllowsCellularAccess:YES];
    [sessionConfiguration setHTTPAdditionalHeaders:@{ @"Accept" : @"application/json" }];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",ServiceURL]];
    NSLog(@"URl %@%@",url,DataString);
    // Configure the Request
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setValue:[NSString stringWithFormat:@"%@=%@", strSessName, strSessVal] forHTTPHeaderField:@"Cookie"];
    request.HTTPBody = [DataString dataUsingEncoding:NSUTF8StringEncoding];
    request.HTTPMethod = @"Post";

    // post the request and handle response
    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
                                          {
                                              // Handle the Response
                                              if(error)
                                              {
                                                  NSLog(@"%@",[NSString stringWithFormat:@"Connection failed: %@", [error description]]);

                                                  // Update the View
                                                  dispatch_async(dispatch_get_main_queue(), ^{

                                                      // Hide the Loader
                                                      [MBProgressHUD hideHUDForView:[[UIApplication sharedApplication] delegate].window animated:YES];


                                                  });
                                                  return;
                                              }
                                              NSArray * cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:request.URL];
                                              for (NSHTTPCookie * cookie in cookies)
                                              {
                                                  NSLog(@"%@=%@", cookie.name, cookie.value);
                                                  strSessName=cookie.name;
                                                  strSessVal=cookie.value;

                                              }

                                              NSString *retVal = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}];
[postDataTask resume];

}

该服务对于 Xcode 早期版本和 iOS 早期版本运行良好但是当我更新到 iOS 9.0 上的 Xcode 7.0 时，当我调用上述 Web
服务方法时，它开始给我以下问题。我得到的记录错误是：

连接失败：错误域 = NSURLErrorDomain 代码 = -1022 “无法加载资源，因为应用程序传输安全策略需要使用安全连接。”
UserInfo={NSUnderlyingError=0x7fada0f31880 {Error
Domain=kCFErrorDomainCFNetwork Code=-1022 “(null)”},
NSErrorFailingURLStringKey= MyServiceURL , NSErrorFailingURLKey=
MyServiceURL , NSLocalizedDescription=资源无法加载，因为应用传输安全策略需要使用安全的联系。}