使用 NSDate 正好 1 天

Question

我如何使用 NSDate 准确地获得 1 天，即从 2014-08-01 00:00:00 +0000 到 2014-08-01 23:59:59 +0000。这可以使用 NSDate 获得吗？

Answer 1

我不清楚你的问题。如果你想第二天得到NSDate：

+ (NSDate *)numberOfDays:(NSInteger)numberOfDays from:(NSDate *)fromDate {
    NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
    dayComponent.day = numberOfDays;

    NSCalendar *calendar = [NSCalendar currentCalendar];
    return [calendar dateByAddingComponents:dayComponent toDate:fromDate options:0];
}

如果要比较两个NSDate 是否在同一天，那么（来自 NSDate 类别）：

- (BOOL)isOnTheSameDayAs:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components1 = [calendar components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:self];
    NSDateComponents *components2 = [calendar components:NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit fromDate:date];

    return ((components1.year == components2.year) &&
            (components1.month == components2.month) &&
            (components1.day == components2.day));
}