我想在NSDateComponents类中获得四分之一值 [英] I want to get a quarter value in NSDateComponents class

问题描述

我想从指定日期获得四分之一的值。 （*日期变量）

I want to get a quarter value from specified date. (*date variable)

所以。我已经制作了以下代码并运行。
但是，季度值为零。

So. I have made following code and run. but, quarter value is zero.

为什么季度值为零？
哪里有问题？

Why quarter value is zero? where's problem?

请高级人员提出建议。

Please advice from advanced man.

NSDateComponents *comp1 = [[NSDateComponents alloc] init];
[comp1 setYear:2012];
[comp1 setMonth:6];
[comp1 setDay:1];

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDate *date = [gregorian dateFromComponents:comp1];  <== want to get a quarter value.

unsigned int unitFlags = NSYearCalendarUnit | NSQuarterCalendarUnit | NSMonthCalendarUnit | NSWeekOfYearCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *comp2 = [gregorian components:unitFlags fromDate:date];

NSLog(@"year :       %5d",[comp2 year]);
NSLog(@"quarter :    %5d",[comp2 quarter]);
NSLog(@"month :      %5d",[comp2 month]);
NSLog(@"weekofYear : %5d",[comp2 weekOfYear]);
NSLog(@"day :        %5d",[comp2 day]);

结果：

2012-07-24 03:44:14.776 dateTest[1228:1307] year :        2012
2012-07-24 03:44:14.776 dateTest[1228:1307] quarter :        0
2012-07-24 03:44:14.777 dateTest[1228:1307] month :          6
2012-07-24 03:44:14.777 dateTest[1228:1307] weekofYear :    22
2012-07-24 03:44:14.778 dateTest[1228:1307] day :            1

推荐答案

似乎忽略了NSQuarterCalendarUnit的问题（尚未验证，但确实看到了报告的错误）。无论如何，它很简单到处...只需使用NSDateFormatter类。

It seems that there is an issue with the NSQuarterCalendarUnit being ignored (haven't verified, but did see a bug reported). Anyway, it is simple enough to get around... Just use the NSDateFormatter class.

// After your NSDate *date, add...
NSDateFormatter *quarterOnly = [[NSDateFormatter alloc]init];
[quarterOnly setDateFormat:@"Q"];

int quarter = [[quarterOnly stringFromDate:date] intValue];

// Then change the quarter NSLog too
NSLog(@"quarter :    %5d", quarter);

应该可以正常工作......

Should work fine...

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