8

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.}

问题是我应该在哪里设置 AFNetworking 2.0 中的允许片段？

更新：

我的类是 AFHTTPSessionManager 的子类。我已经创建了一个 JSONResponseSerializer，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}]
4

2 回答 2

7

您需要创建自己的AFJSONResponseSerializer使用实例serializerWithReadingOptions:并配置系统以使用它（代替默认的 JSON 响应序列化程序）。

于 2013-10-28T19:45:54.827 回答
0

我以前也遇到过同样的问题。经过几个小时的搜索和阅读，我发现了一些东西：

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

试试看，祝你好运！

于 2015-02-03T10:26:03.217 回答