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 问题是你的json无效。 所有的titles应该在阵列中吗？ 所以他们必须在[]。 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，这就是你的json看起来应该是这样的： 
 
{
   "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;） 

The problem is that your json is not valid. All the titles should be in array right? So they have to be in [ ]. You can use for example the following site to "debug" your json:
 
http://jsonformatter.curiousconcept.com/
 
Also, in iOS 5 you can use the new built-in JSON api. Here is a nice tutorial for that: http://www.raywenderlich.com/5492/working-with-json-in-ios-5
 
Nevertheless, here is how your json should look like I guess:
 
{
   "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"
            }
         ]
      }
   ]
}
 
Good luck with your project ;)