我想获得日期为 '2014-12-31' 的 weekofYear ，但它总是返回 1 而不是 52
这是我的代码：
NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekOfMonthCalendarUnit | NSWeekOfYearCalendarUnit;
NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:[NSDate date]];
NSlog(@"%i",dateComponent.weekOfYear);
output "1";
我知道结果是正确的，但我想要得到“52”而不是“1”，如何修复它？
另一种方法是使用yearForWeekOfYear的财产NSDateComponents实例。如果yearForWeekOfYear是在传递给的日期的年份之后components:fromDate:，那么现在是第 52 周。
E.g.
NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekOfMonthCalendarUnit | NSWeekOfYearCalendarUnit | NSYearForWeekOfYearCalendarUnit;
NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:[NSDate date]];
NSInteger weekOfYear = dateComponent.weekOfYear;
if (dateComponent.yearForWeekOfYear > dateComponent.year)
weekOfYear = 52;
NSLog(@"%i",weekOfYear); // 52
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