ios - AFNetworking 2.0 和响应序列化选项

Question

一旦我触发对 JSON 资源的请求，我就会得到以下信息:

The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x1d87a2c0 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

问题是我应该在 AFNetworking 2.0 中的什么地方设置允许片段？

更新:

我的类是 AFHTTPSessionManager 的子类。我已经创建了一个 JSONResponseSerializer，但它也不起作用。

返回的JSON如下:

   [{"StoryId":1,"Title":"The big red dog","Abstract":"There was a big red dog and the dog was very big","IsFeatured":true}]

-(instancetype) initWithBaseURL:(NSURL *)url
{
    NSURL *base = [NSURL URLWithString:@"URL to the web service that returns the json"];
    self = [super initWithBaseURL:base];

    AFJSONResponseSerializer *responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];

    [self setResponseSerializer:responseSerializer];

    return self;
}

返回的错误如下:

[0] (null)  @"NSDebugDescription" : @"Invalid value around character 0."

来自网络服务器的响应:

[{"StoryId":1,"Title":"The big red dog","Abstract":"There was a big red dog and the dog was very big","IsFeatured":true}]

来自网络服务器的响应状态:

HTTP/1.1 200 OK
Server: Microsoft-IIS/7.0
X-Powered-By: ASP.NET
Content-Type: application/json;charset=utf-8
X-AspNetMvc-Version: 3.0
Connection: close
Date: Mon, 28 Oct 2013 20:02:21 GMT
Content-Length: 121
Cache-Control: private
X-AspNet-Version: 4.0.30319

[{"StoryId":1,"Title":"The big red dog","Abstract":"There was a big red dog and the dog was very big","IsFeatured":true}]

Answer 1

您需要使用 serializerWithReadingOptions: 创建您自己的 AFJSONResponseSerializer 实例，并配置您的系统以使用它(代替默认的 JSON 响应序列化器)。