Question

我有一个DateString数组，其中我有日期，月份和年份的值。

现在我按升序排序了。现在我必须用这个键值对把它放到字典中： -

键 - “1月”（月份名称）和值： - 该月份的日期数组

谁能建议我怎么做？

Answer 1

        NSCalendar *calendar = [NSCalendar currentCalendar];
        NSDateComponents *components = [[NSDateComponents alloc] init];

        // Set your year and month here
        [components setYear:2016];

        NSMutableDictionary *dayAndMonthWiseList = [[NSMutableDictionary alloc] init];
        for (int i=1; i<=12; i++)
        {
            [components setMonth:i];

            NSDate *date = [calendar dateFromComponents:components];
            NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date];
            NSMutableArray *dayList = [[[NSMutableArray alloc] init] mutableCopy];

            for (int j=1; j<=range.length; j++)
            {
                [dayList addObject:[NSString stringWithFormat:@"%d",j]];
            }
            [dayAndMonthWiseList setObject:dayList forKey:[NSString stringWithFormat:@"%d",i]];
        }
        NSLog(@"Dic. :%@",dayAndMonthWiseList);

结果是：

Dic. :{
    1 =     (
        1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    10 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    11 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30
    );
    12 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    2 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29
    );
    3 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    4 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30
    );
    5 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    6 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30
    );
    7 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    8 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30,
        31
    );
    9 =     (
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
        26,
        27,
        28,
        29,
        30
    );
}

Answer 2

你编写代码，就像每个人都会这样做。

您需要一个将（年，月）映射到（数组）的字典。

你从一个空的可变字典开始。然后你循环你的项目。获取每个项目，获取年份和月份（我假设您不希望一起使用不同年份的Januarys）。在字典中查找年/月，获取可变数组值。如果不存在，请使用新的可变数组作为值添加（年，月）键。所以现在你有一个（年，月）数组，并将项添加到该数组。

如果您的数据在那时被修复，您可以遍历字典并用不可变数组替换所有可变数组（只需使用copy）。而不是首先对所有项目进行排序，只需对字典的键进行排序，因此现在按月和年排序，然后在需要排序时对数组进行排序。例如，在tableview中，您只需要那些实际显示的已排序数组。

从DateArray按月进行NSDictionary

2 个答案: