ios -如何从NSDictionary获取值？

Question

我对NSDictionary相当缺乏经验。我有这样的数据结构：

{"aps":
  {"alert":null},
   "custom_control":
    {"type":"topic_comment",
     "object":
        {"topic_id":"1","topic_section":"2","plan_id":"3","user_id":"4"}
    }
}

我可以通过如下操作获得"aps“值：

    NSString *aps = [dictionary objectForKey:@"aps"];

但是由于ap包含一个项目数组，我应该使用什么数据结构来代替NSString呢？如何获取custom_control的值和"object“中的值

谢谢!

Answer 1

NSDictionary *dict_object = [[dictionary objectForKey:@"custom_control"]objectForKey:@"object"];

这是你的字典的确切层次结构

你的NSDictionary(Keys:aps,custom_control)

(i).aps

   (i.i)NSDictionary(key:alert)

(ii).custom_control

   (ii.i)NSDictionary(keys:type,object)

          (ii.i.i)NSString(key:topic_comment)

          (ii.i.ii)NSDictionary(keys:topic_id,topic_section,plan_id,user_id)

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