iphone - 如何使用 JSON-Framework 在 XCode 上检测 JSON 对象/JSON 数组

Question

我在 JSON 解析方面遇到一些问题。当我点击 URL 时，我得到如下 JSON 响应:

//JSON 1
{ "data":
  {"array":
    ["3",
       {"array":
          [
            {"id":"1","message":"Hello","sender":"inot"},
            {"id":"2","message":"World","sender":"inot"},
            {"id":"3","message":"Hi","sender":"marza"}
          ]
        }
     ]
   },
 "message":"MSG0001:Success",
 "status":"OK"
}

但是如果数据的结果只是1，那么JSON响应是这样的:

//JSON 2
{ "data":
  {"array":
    ["3",
       {"array":
          {"id":"3","message":"Hi","sender":"marza"}
       }
     ]
   },
 "message":"MSG0001:Success",
 "status":"OK"
}

我实现此代码来获取 id、消息和发件人值，并且在 JSON 1 上工作正常，但在 JSON 2 上出错。我使用 JSON-Framework。问题是如何检测 JSON 响应是对象 ({ }) 还是数组 ([ ]) ??

// Parse the string into JSON
NSDictionary *json = [myString JSONValue];

// Get all object
NSArray *items = [json valueForKeyPath:@"data.array"];
NSArray *array1 = [[items objectAtIndex:1] objectForKey:@"array"];
NSEnumerator *enumerator = [array1 objectEnumerator];
NSDictionary* item;
while (item = (NSDictionary*)[enumerator nextObject]) {
   NSLog(@"id      = %@",[item objectForKey:@"id"]);
   NSLog(@"message = %@",[item objectForKey:@"message"]);
   NSLog(@"sender  = %@",[item objectForKey:@"sender"]);
}

Answer 1

您可以使用id并检查您获取的对象是否是NSArray或NSDictionary，如下所示:

id item = [json valueForKeyPath:@"data.array"];
if ([item isKindOfClass:[NSArray class]]) {
    // item is an array
}
else if ([item isKindOfClass:[NSDictionary class]]) {
    // item is a dictionary
}