1

目前我有一个 JSON 对象，但是当我解析 VALUES 中的 startLabel 键配对元素时，我返回一个 nsdictionary，其中第一个元素为 NULL，其键为值。

这是 JSON 对象

(
        {
        values =         (
                                {
                        start = 1370066400;
                        startLabel = 20130601000000;
                        value = "1.000000047497";
                    },
                                {
                        start = 1370067300;
                        startLabel = 20130601001500;
                        value = "1.000000047497";
                    },
                                {
                        start = 1370068200;
                        startLabel = 20130601003000;
                        value = "1.000000047497";
                    }
             );
       }
)

目前，这是字典对象“dict”的 NSLog 输出

(
"<null>",
    (
    20130601000000,
    20130601001500,
    20130601003000,
    20130601004500,
    20130601010000,
    20130601011500,
    20130601013000,
    20130601014500,
    20130601020000,
    20130601021500,
    20130601023000,
    20130601024500,
    20130601030000,
    20130601031500,
    20130601033000,
    20130601034500,
    20130601040000,
    20130601041500,
    20130601043000,
    20130601044500,
    20130601050000,
    20130601051500,
    20130601053000,
    20130601054500,
    20130601060000,
    20130601061500,
    20130601063000,
    20130601064500,
    20130601070000,
    20130601071500,
    20130601073000,
    20130601074500,
    20130601080000,
    20130601081500,
    20130601083000,
    20130601084500,
    20130601090000,
    20130601091500,
    20130601093000,
    20130601094500,
    20130601100000,
    20130601101500,
    20130601103000,
    20130601104500,
    20130601110000,
    20130601111500,
    20130601113000,
    20130601114500,
    20130601120000,
    20130601121500,
    20130601123000,
    20130601124500,
    20130601130000,
    20130601131500,
    20130601133000,
    20130601134500,
    20130601140000,
    20130601141500,
    20130601143000,
    20130601144500,
    20130601150000,
    20130601151500,
    20130601153000,
    20130601154500,
    20130601160000,
    20130601161500,
    20130601163000,
    20130601164500,
    20130601170000,
    20130601171500,
    20130601173000,
    20130601174500,
    20130601180000,
    20130601181500,
    20130601183000,
    20130601184500,
    20130601190000,
    20130601191500,
    20130601193000,
    20130601194500,
    20130601200000,
    20130601201500,
    20130601203000,
    20130601204500,
    20130601210000,
    20130601211500,
    20130601213000,
    20130601214500,
    20130601220000,
    20130601221500,
    20130601223000,
    20130601224500,
    20130601230000,
    20130601231500,
    20130601233000,
    20130601234500
    )
)

如何获取不包含 null 作为第一个 Key 的字典对象？

这是我使用的代码：

NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];

NSArray* data = [json objectForKey:@"fields"];
NSDictionary *graphStartDate = [data valueForKeyPath:@"values.startLabel"];

如果需要更多代码，请询问:) 但基本上就是这样。

4

1 回答 1

0

问题解决.....

我创建了另一个访问给定字典对象的第二个关键元素的 NSArray，并且我能够获取所有给定的值.....

有点黑客解决方法，使程序效率降低....

NSArray *array = [graphStartDate objectAtIndex:1];

不完全确定如何摆脱空对象，但我将与使用 javascript 编写 Web 服务器的开发人员一起更详细地了解真正发生的事情......

于 2013-06-18T15:32:36.050 回答