那么，你说的展示是什么意思？你只是想在计算中使用科普特历法吗？如果是这样的话，您所需要的就是一个合适的NSCalendar实例。由于NSCalendar (和朋友)是由重症监护室支持的，你可以使用任何identifier that ICU supports (在“键/类型定义”下)。这意味着您可以从以下各项中进行选择：

gregorian - (default)
islamic -天文Arabic
chinese -繁体中文calendar
islamic-civil -民用(算法)阿拉伯语calendar
hebrew -传统希伯来语Calendar
japanese -英制日历(除年份外与公历相同，每个Emperor)
buddhist -泰式佛教日历与公历相同(除year)
persian -波斯Calendar
coptic -科普特Calendar
ethiopic -埃塞俄比亚日历

外与公历相同

因此，要获取NSCalendar实例，需要执行以下操作：

NSCalendar *coptic = [[NSCalendar alloc] initWithCalendarIdentifier:@"coptic"];

然而，如果你真的想要绘制一些UI (如iCal)，那么你需要更多的信息。幸运的是，您也可以从NSCalendar获得它。

例如，您需要知道日历有多少个月：

NSRange minMonthRange = [coptic minimumRangeOfUnit:NSMonthCalendarUnit]; // {1,13}
NSRange maxMonthRange = [coptic maximumRangeOfUnit:NSMonthCalendarUnit]; // {1,13}

所以看起来每年都有13个月。好的，那么一个月中的几天呢？

NSRange minDayRange = [coptic minimumRangeOfUnit:NSDayCalendarUnit]; // {1,5}
NSRange maxDayRange = [coptic maximumRangeOfUnit:NSDayCalendarUnit]; // {1,30}

哇哦！看起来你可以有一个只有5天的月份！(但没有超过30天的月份)让我们看看是否可以找到更多：

NSDateComponents *firstDayOfMonth = [[NSDateComponents alloc] init];
[firstDayOfMonth setDay:1];
for (NSInteger y = 1500; y < 1520; ++y) {
    [firstDayOfMonth setYear:y];
    for (NSInteger m = 1; m <= 13; ++m) {
        [firstDayOfMonth setMonth:m];

        NSDate *date = [coptic dateFromComponents:firstDayOfMonth];

        NSRange rangeOfDaysInMonth = [coptic rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:date];
        NSLog(@"%d - %d => %@", y, m, NSStringFromRange(rangeOfDaysInMonth));
    }
}

这将迭代20年，并构建一个与每年每个月的第一天相对应的NSDate。然后，它查看该月有多少天，并记录结果。(请注意，1500和1520是我任意选择的年份)

这记录了：

1500 - 1 => {1, 30}
1500 - 2 => {1, 30}
1500 - 3 => {1, 30}
1500 - 4 => {1, 30}
1500 - 5 => {1, 30}
1500 - 6 => {1, 30}
1500 - 7 => {1, 30}
1500 - 8 => {1, 30}
1500 - 9 => {1, 30}
1500 - 10 => {1, 30}
1500 - 11 => {1, 30}
1500 - 12 => {1, 30}
1500 - 13 => {1, 5}
1501 - 1 => {1, 30}
1501 - 2 => {1, 30}
1501 - 3 => {1, 30}
1501 - 4 => {1, 30}
1501 - 5 => {1, 30}
1501 - 6 => {1, 30}
1501 - 7 => {1, 30}
1501 - 8 => {1, 30}
1501 - 9 => {1, 30}
1501 - 10 => {1, 30}
1501 - 11 => {1, 30}
1501 - 12 => {1, 30}
1501 - 13 => {1, 5}
1502 - 1 => {1, 30}
1502 - 2 => {1, 30}
1502 - 3 => {1, 30}
1502 - 4 => {1, 30}
1502 - 5 => {1, 30}
1502 - 6 => {1, 30}
1502 - 7 => {1, 30}
1502 - 8 => {1, 30}
1502 - 9 => {1, 30}
1502 - 10 => {1, 30}
1502 - 11 => {1, 30}
1502 - 12 => {1, 30}
1502 - 13 => {1, 5}
1503 - 1 => {1, 30}
1503 - 2 => {1, 30}
1503 - 3 => {1, 30}
1503 - 4 => {1, 30}
1503 - 5 => {1, 30}
1503 - 6 => {1, 30}
1503 - 7 => {1, 30}
1503 - 8 => {1, 30}
1503 - 9 => {1, 30}
1503 - 10 => {1, 30}
1503 - 11 => {1, 30}
1503 - 12 => {1, 30}
1503 - 13 => {1, 6}
1504 - 1 => {1, 30}
1504 - 2 => {1, 30}
1504 - 3 => {1, 30}
1504 - 4 => {1, 30}
1504 - 5 => {1, 30}
1504 - 6 => {1, 30}
1504 - 7 => {1, 30}
1504 - 8 => {1, 30}
1504 - 9 => {1, 30}
1504 - 10 => {1, 30}
1504 - 11 => {1, 30}
1504 - 12 => {1, 30}
1504 - 13 => {1, 5}
1505 - 1 => {1, 30}
1505 - 2 => {1, 30}
1505 - 3 => {1, 30}
1505 - 4 => {1, 30}
1505 - 5 => {1, 30}
1505 - 6 => {1, 30}
1505 - 7 => {1, 30}
1505 - 8 => {1, 30}
1505 - 9 => {1, 30}
1505 - 10 => {1, 30}
1505 - 11 => {1, 30}
1505 - 12 => {1, 30}
1505 - 13 => {1, 5}
1506 - 1 => {1, 30}
1506 - 2 => {1, 30}
1506 - 3 => {1, 30}
1506 - 4 => {1, 30}
1506 - 5 => {1, 30}
1506 - 6 => {1, 30}
1506 - 7 => {1, 30}
1506 - 8 => {1, 30}
1506 - 9 => {1, 30}
1506 - 10 => {1, 30}
1506 - 11 => {1, 30}
1506 - 12 => {1, 30}
1506 - 13 => {1, 5}
1507 - 1 => {1, 30}
1507 - 2 => {1, 30}
1507 - 3 => {1, 30}
1507 - 4 => {1, 30}
1507 - 5 => {1, 30}
1507 - 6 => {1, 30}
1507 - 7 => {1, 30}
1507 - 8 => {1, 30}
1507 - 9 => {1, 30}
1507 - 10 => {1, 30}
1507 - 11 => {1, 30}
1507 - 12 => {1, 30}
1507 - 13 => {1, 6}
1508 - 1 => {1, 30}
1508 - 2 => {1, 30}
1508 - 3 => {1, 30}
1508 - 4 => {1, 30}
1508 - 5 => {1, 30}
1508 - 6 => {1, 30}
1508 - 7 => {1, 30}
1508 - 8 => {1, 30}
1508 - 9 => {1, 30}
1508 - 10 => {1, 30}
1508 - 11 => {1, 30}
1508 - 12 => {1, 30}
1508 - 13 => {1, 5}
1509 - 1 => {1, 30}
1509 - 2 => {1, 30}
1509 - 3 => {1, 30}
1509 - 4 => {1, 30}
1509 - 5 => {1, 30}
1509 - 6 => {1, 30}
1509 - 7 => {1, 30}
1509 - 8 => {1, 30}
1509 - 9 => {1, 30}
1509 - 10 => {1, 30}
1509 - 11 => {1, 30}
1509 - 12 => {1, 30}
1509 - 13 => {1, 5}
1510 - 1 => {1, 30}
1510 - 2 => {1, 30}
1510 - 3 => {1, 30}
1510 - 4 => {1, 30}
1510 - 5 => {1, 30}
1510 - 6 => {1, 30}
1510 - 7 => {1, 30}
1510 - 8 => {1, 30}
1510 - 9 => {1, 30}
1510 - 10 => {1, 30}
1510 - 11 => {1, 30}
1510 - 12 => {1, 30}
1510 - 13 => {1, 5}
1511 - 1 => {1, 30}
1511 - 2 => {1, 30}
1511 - 3 => {1, 30}
1511 - 4 => {1, 30}
1511 - 5 => {1, 30}
1511 - 6 => {1, 30}
1511 - 7 => {1, 30}
1511 - 8 => {1, 30}
1511 - 9 => {1, 30}
1511 - 10 => {1, 30}
1511 - 11 => {1, 30}
1511 - 12 => {1, 30}
1511 - 13 => {1, 6}
1512 - 1 => {1, 30}
1512 - 2 => {1, 30}
1512 - 3 => {1, 30}
1512 - 4 => {1, 30}
1512 - 5 => {1, 30}
1512 - 6 => {1, 30}
1512 - 7 => {1, 30}
1512 - 8 => {1, 30}
1512 - 9 => {1, 30}
1512 - 10 => {1, 30}
1512 - 11 => {1, 30}
1512 - 12 => {1, 30}
1512 - 13 => {1, 5}
1513 - 1 => {1, 30}
1513 - 2 => {1, 30}
1513 - 3 => {1, 30}
1513 - 4 => {1, 30}
1513 - 5 => {1, 30}
1513 - 6 => {1, 30}
1513 - 7 => {1, 30}
1513 - 8 => {1, 30}
1513 - 9 => {1, 30}
1513 - 10 => {1, 30}
1513 - 11 => {1, 30}
1513 - 12 => {1, 30}
1513 - 13 => {1, 5}
1514 - 1 => {1, 30}
1514 - 2 => {1, 30}
1514 - 3 => {1, 30}
1514 - 4 => {1, 30}
1514 - 5 => {1, 30}
1514 - 6 => {1, 30}
1514 - 7 => {1, 30}
1514 - 8 => {1, 30}
1514 - 9 => {1, 30}
1514 - 10 => {1, 30}
1514 - 11 => {1, 30}
1514 - 12 => {1, 30}
1514 - 13 => {1, 5}
1515 - 1 => {1, 30}
1515 - 2 => {1, 30}
1515 - 3 => {1, 30}
1515 - 4 => {1, 30}
1515 - 5 => {1, 30}
1515 - 6 => {1, 30}
1515 - 7 => {1, 30}
1515 - 8 => {1, 30}
1515 - 9 => {1, 30}
1515 - 10 => {1, 30}
1515 - 11 => {1, 30}
1515 - 12 => {1, 30}
1515 - 13 => {1, 6}
1516 - 1 => {1, 30}
1516 - 2 => {1, 30}
1516 - 3 => {1, 30}
1516 - 4 => {1, 30}
1516 - 5 => {1, 30}
1516 - 6 => {1, 30}
1516 - 7 => {1, 30}
1516 - 8 => {1, 30}
1516 - 9 => {1, 30}
1516 - 10 => {1, 30}
1516 - 11 => {1, 30}
1516 - 12 => {1, 30}
1516 - 13 => {1, 5}
1517 - 1 => {1, 30}
1517 - 2 => {1, 30}
1517 - 3 => {1, 30}
1517 - 4 => {1, 30}
1517 - 5 => {1, 30}
1517 - 6 => {1, 30}
1517 - 7 => {1, 30}
1517 - 8 => {1, 30}
1517 - 9 => {1, 30}
1517 - 10 => {1, 30}
1517 - 11 => {1, 30}
1517 - 12 => {1, 30}
1517 - 13 => {1, 5}
1518 - 1 => {1, 30}
1518 - 2 => {1, 30}
1518 - 3 => {1, 30}
1518 - 4 => {1, 30}
1518 - 5 => {1, 30}
1518 - 6 => {1, 30}
1518 - 7 => {1, 30}
1518 - 8 => {1, 30}
1518 - 9 => {1, 30}
1518 - 10 => {1, 30}
1518 - 11 => {1, 30}
1518 - 12 => {1, 30}
1518 - 13 => {1, 5}
1519 - 1 => {1, 30}
1519 - 2 => {1, 30}
1519 - 3 => {1, 30}
1519 - 4 => {1, 30}
1519 - 5 => {1, 30}
1519 - 6 => {1, 30}
1519 - 7 => {1, 30}
1519 - 8 => {1, 30}
1519 - 9 => {1, 30}
1519 - 10 => {1, 30}
1519 - 11 => {1, 30}
1519 - 12 => {1, 30}
1519 - 13 => {1, 6}

分析这一点，我们看到每个月有30天，除了13个月，(通常)有5天。似乎每4年一次，第13个月有6天。这一定是它处理闰日的方式。这确实是一个很好的日历！一切都很好很正常。

让我们来看看更多：

NSRange minHourRange = [coptic minimumRangeOfUnit:NSHourCalendarUnit]; // {0,24}
NSRange maxHourRange = [coptic maximumRangeOfUnit:NSHourCalendarUnit]; // {0,24}

因此，每天有24小时(夏令时跳跃不会反映在此范围内。公历还报告了{0,24}的最小小时范围和{0,24}的最大小时范围，尽管有些天有23小时或25小时，这取决于DST转换)。

在分钟和秒级别(每分钟和秒各60)，情况也是正常的。

因此，如果您希望自己显示日历，则需要一个能够处理一年中13个月的UI，其中一个月的长度不到一周。在次日级别，事情是我们所习惯的。

当然，你也可以去看看科普特日历上的Wikipedia article。

编辑(基于注释)

如果您想要做的只是将日期格式化为字符串，那么(当然)您将转向NSDateFormatter

NSDateFormatter *f = [[NSDateFormatter alloc] init];
NSCalendar *coptic = [[NSCalendar alloc] initWithCalendarIdentifier:@"coptic"];
[f setCalendar:coptic];
[f setDateStyle:NSDateFormatterLongStyle];

NSDate *rightNow = [NSDate date];
NSString *formattedDate = [f stringFromDate:rightNow];
NSLog(@"%@", formattedDate); // logs "Bashans 4, 1728"

票数 9

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/10564610

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