ios - 无法解析基本的 JSON - iOS

Question

我有一个 iOS 应用程序，它从 Facebook API 下载并解析一个 JSON 文件。

但是，每当我尝试解析它时，我的应用程序就会崩溃并收到此错误:

2013-11-06 15:31:41.473 JSONTESTER[10881:70b] -[__NSCFDictionary objectAtIndex:]: unrecognized 
selector sent to instance 0x10d01bd30
2013-11-06 15:31:41.476 JSONTESTER[10881:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x10d01bd30'

这是我要解析的简单 JSON 文件:

{


"id": "xxxxxxxxxx",
   "name": "Dan Sadjadian",
   "home": {
      "data": [
         {
            "id": "xxxxxxxxxxxxxxxxxxxxxx",
            "from": {
               "name": "Jane Smith",
               "id": "xxxxxxxxxxxxxxx"
            },
            "message": "deadline is only 16 days!!! Where are you guys!!!!!!!!! Please shall we start!!!!!",
            "actions": [
               {
                  "name": "Comment",
                  "link": "https://www.facebook.com/xxxxxxx/posts/xxxxxxxxxxx"
               },
               {
                  "name": "Like",
                  "link": "https://www.facebook.com/xxxxxxxxx/posts/xxxxxxxxxxxx"
               }
            ],
            "privacy": {
               "value": ""
            },
            "type": "status",
            "status_type": "mobile_status_update",
            "created_time": "2013-11-06T14:40:23+0000",
            "updated_time": "2013-11-06T14:40:23+0000"
         },
       ],
     },
}

这是我的代码，应该可以工作....

cell.username.text = [[[[[facebook_array objectAtIndex:index] valueForKey:@"data"] objectAtIndex:0] valueForKey:@"from"] valueForKey:@"name"];

如您所见，我正在尝试访问“from”中的“name”，它位于“home”中的“data”数组中。

我做错了什么？

谢谢，丹。

Answer 1

应该是

NSArray *arrData=[MAIN_DICTIONARY objectForKey:@"data"];

NSDictionary *data=[arrData objectForIndex:0];

NSDictionary *from=[data objectForKey:@"from"];

NSLog(@"Name = %@", [from objectForKey:@"name"]);

我希望它能帮助你理解它是如何工作的。