如何使用JSON框架检测Xcode上的JSON对象/ JSON数组

Question

我对json解析有一些问题。当我点击URL时，我已经这样有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"
}

.

但如果数据结果仅为1，则JSON响应就是如此：

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

.

我实现了此代码以获取ID，消息和发件人值，并在JSON 1上工作正常，但在JSON 2上错误。我使用JSON框架。问题是如何检测到JSON响应是对象（{}）或数组（[]）??

// 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

可以使用id并检查您获得的对象是否是nsArray或nsdictionary：

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
}

.