Ios AFNetworking 2.0和响应序列化选项

一旦触发对JSON资源的请求，我就会得到以下结果：

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.}

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

问题是，在AFNetworking 2.0中，我应该在哪里设置允许片段

更新：

我的类是AFHTTPSessionManager的一个子类。我已经创建了一个JSONResponseSerializer，但它也不起作用

返回的JSON如下所示：

   [{"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;
}

返回的错误如下所示：

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.}

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

来自WEB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WEB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}]

---

您需要使用带有读取选项的

serializer:

创建自己的

AFJSONResponseSerializer

实例，并将系统配置为使用它（代替默认的JSON响应serialiser）。

我以前遇到过同样的问题。经过几个小时的搜索和阅读，我发现了一些东西：

self.responseSerializer=[AFHTTPResponseSerializer序列化程序]； self.responseSerializer.acceptableContentTypes=[NSSet setWithObjects:@“application/json；charset=UTF-8”，nil]

---

试试看，祝你好运

这是web服务器响应的问题，而不是AFNetworking的问题。响应是有效的！我只是验证了JSON，返回的JSON是有效的，我没有说它无效。我说问题是由它引起的。JSON数据往往包含在数组或对象中@Wain是对的，你必须告诉AFNetworking哪些选项应该

NSJSONSerialization

用于读取JSON数据。我已经这样做了，看看我更新的问题！啊，我看到了你的编辑，我收回了我的话。请看我更新的问题！我添加了AFJSONResponseSerializer，但仍然没有用！您的JSON看起来没有片段。您确定正在使用您的自定义类吗？。。。您确定响应没有损坏或包含在其他内容中吗？请参阅标题为“来自WEB服务器的响应”的问题。这就是我得到的实际反应。