iOS 5 Google JSON - 如何解析嵌套对象？

Question

我正在尝试解析 Youtube 播放列表：

如果我的 JSON 结构如下：

{"apiVersion" .... 
"items":[{"id2":"some-id","title":"songtitle",

我完全可以通过以下方式解析标题：

// Fill array
NSArray *items = [json objectForKey:@"items"];

// Get item from tableData
NSDictionary *item = [tableData objectAtIndex:[indexPath row]];
// Set text on textLabel
[[cell textLabel] setText:[item objectForKey:@"title"]];

但是如果 JSON 是这样的：

{"apiVersion" .... 
"items":[{"id1": .... "video":{"id2":"some-id","title":"songtitle",

如何获得嵌套对象的标题？

只是一件简单的事情，但我已经为此苦苦思考了好几个小时。郁闷了，谢谢你的建议！

[编辑] 这是完整的结构：

{
    "items":
    [
    {
    "video":
            {
                "title": "Number One",
                "description": "Description one"
            },    
            {
             "title": "Number two",
                "description": "Description two"
            },
            {
                "title": "Number three",
                "description": "Description three"
            }
    },
    {   
    "video":
            {
         "title": "Number One",
             "description": "Description one"
            },
            {
                "title": "Number two",
              "description": "Description two"
            },
            {
               "title": "Number three",
              "description": "Description three"
            }
    }

    ]
}

Answer 1

试试这个：

NSArray *items = [[json valueForkey:@"items"]valueForkey:"video"];

Answer 2

NSMutableArray *items = [json valueForkey:@"items"];
for(int i =0;i<[items count]; i++)
{
  NSMutableArray *arrtitle = [[[items objectAtIndex:i]valueForkey:@"Video"]copy];
  for(int j =0;j<[arrtitle count]; j++)
  {
    NSString *title = [[arrtitle objectAtIndex:j]valueForkey:@"title"];
  }
} 

也许对你有帮助。

Answer 3

问题是您的 json 无效。所有titles 都应该在数组中，对吗？所以他们必须在[]中。例如，您可以使用以下站点来“调试”您的 json：

http://jsonformatter.curiousconcept.com/

此外，在 iOS 5 中，您可以使用新的内置 JSON api。这是一个很好的教程： http://www.raywenderlich.com/5492/working-with-json-in-ios-5

不过，我猜你的 json 应该是这样的：

{
   "items":[
      {
         "video":[
            {
               "title":"Number One",
               "description":"Description one"
            },
            {
               "title":"Number two",
               "description":"Description two"
            },
            {
               "title":"Number three",
               "description":"Description three"
            }
         ]
      },
      {
         "video":[
            {
               "title":"Number One",
               "description":"Description one"
            },
            {
               "title":"Number two",
               "description":"Description two"
            },
            {
               "title":"Number three",
               "description":"Description three"
            }
         ]
      }
   ]
}

祝你的项目好运；）