iphone - 将 NSDate 拆分为年月日

Question

如果我有一个像 04-30-2006 这样的日期 我怎样才能拆分并得到月、日和年

还有什么直接比较年份的方法吗？

Answer 1

你必须使用 NSDateComponents。像这样:

NSDate *date = [NSDate date];
NSUInteger componentFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *components = [[NSCalendar currentCalendar] components:componentFlags fromDate:date];
NSInteger year = [components year];
NSInteger month = [components month];
NSInteger day = [components day];

Alsois there any direct way of comparing the years ?

不是内置的。但是你可以为它写一个类别。像这样:

@interface NSDate (YearCompare)
- (BOOL)yearIsEqualToDate:(NSDate *)compareDate;
@end

@implementation NSDate (YearCompare)

- (BOOL)yearIsEqualToDate:(NSDate *)compareDate {
    NSDateComponents *myComponents = [[NSCalendar currentCalendar] components:NSYearCalendarUnit fromDate:self];
    NSDateComponents *otherComponents = [[NSCalendar currentCalendar] components:NSYearCalendarUnit fromDate:compareDate];
    if ([myComponents year] == [otherComponents year]) {
        return YES;
    }
    return NO;
}

@end