Objective c 在NSDictionary中获取值

我想从

NSDictionary

中获取值。我想控制“代码”键根据代码键，我会得到基准值。当我尝试不同的方法时，会收到错误消息

错误消息

2011-08-11 12:45:21.549 AOK[6312:207]-[uuu NSArrayM getObjects:andKeys:：发送到实例0x5e138b0的选择器无法识别 2011-08-11 12:45:21.550 AOK[6312:207]*由于以下原因终止应用程序 未捕获异常“NSInvalidArgumentException”，原因：'-[\uu NSArrayM getObjects:andKeys:：发送到实例的选择器无法识别 0x5e138b0' *第一次抛出时调用堆栈：

国家统计局词典

(
        {
        Omschrijving = "ADDD";
        Ophaaldata =         {
            Datum =             (
                "2011-07-04",
                "2011-07-11",
                "2011-07-18",
                "2011-07-25"
            );
        };
    },
        {
        Omschrijving = "BBBB";
        Ophaaldata =         {
            Datum =             (
                "2011-07-05",
                "2011-07-12",
                "2011-07-19",
                "2011-07-26"
            );
        };
    },
        {
        Omschrijving = "KKKK";
        Ophaaldata =         {
            Datum =             (
                "2011-07-07",
                "2011-07-14",
                "2011-07-21",
                "2011-07-28"
            );
        };
    },
        {
        Omschrijving = "LLLLL";
        Ophaaldata =         {
            Datum =             (
                "2011-07-01",
                "2011-07-08",
                "2011-07-15",
                "2011-07-22",
                "2011-07-29"
            );
        };
    },
        {
        Omschrijving = "MMMMM";
        Ophaaldata =         {
            Datum =             (
                "2011-07-01",
                "2011-07-15",
                "2011-07-29"
            );
        };
    },
        {
        Code = POP;
        Omschrijving = "FFFF";
        Ophaaldata =         {
            Datum = "2011-07-12";
        };
    },
        {
        Code = 00;
        Omschrijving = "SSSS";
        Ophaaldata =         {
            Datum =             (
                "2011-07-14",
                "2011-07-27"
            );
        };
    },
        {
        Code = 01;
        Omschrijving = "CCCCC";
        Ophaaldata =         {
            Datum =             (
                "2011-07-06",
                "2011-07-20"
            );
        };
    }
)

---

您确定您有一个

NSDictionary

而不是一个

NSArray

？

您显示的是一个NSDictionary的NSArray，每个NSDictionary都包含一个带有说明的NSString（Omschrijving）和一个带有一个键（数据）的NSDictionary（Ophaaldata），这是一个日期数组。如果将

对象：和键：

发送到NSArray，它将无法工作

以下是几个示例，说明了如何获取单个项目：

NSArray          *dicts = ...; // wherever you get the array
  NSDictionary   *mijnDict = [dicts objectAtIndex: n];
    NSString     *omschrijving = [mijnDict objectForKey: @"Omschrijving"];
    NSDictionary *ophaaldata = [mijnDict objectForkey: @"Ophaaldata"];
      NSArray    *datum = [ophaaldata objectForkey: @"Datum"];
        NSString *eersteDatum = [datum objectAtIndex: 0];

---

这些只是说明如何处理这些项目的示例。但这是您的输出显示的结构。无论如何，其他任何东西都是无用的，因为字典只能包含每个键一次。我对代码进行了一些格式化，因此您可以更好地查看结构。

在响应过程中，请记住行的值

{ .......... } indicates dictionary.
(............) indicates array.
Dictionary always have key with it like somename = "value in it", .......
Array has value seperated by comma like a , b , c .....
Now it is possible it may have array into dictionary like { somekey = ( a,b,c) } and vice versa

---

是的，我用字典。我一步一步地得到这个值

{ .......... } indicates dictionary.
(............) indicates array.
Dictionary always have key with it like somename = "value in it", .......
Array has value seperated by comma like a , b , c .....
Now it is possible it may have array into dictionary like { somekey = ( a,b,c) } and vice versa