ios-NSTimeInterval時間零點

NSTimeInterval時間零點

如何計算NSTimeInterval當日時間的時，分，秒為零點？

我只得到NSTimeInterval ：

NSTimeInterval today = [[NSDate date] timeIntervalSince1970];

如何重置為00:00:00？

最佳回答：

NSDate *currentDate = [NSDate date];
NSDateComponents *currentDateComponents = [calendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:currentDate];
NSDateComponents *currentDateToMidnight = [[NSDateComponents alloc] init];
[currentDateToMidnight setHour:-[currentDateComponents hour]];
[currentDateToMidnight setMinute:-[currentDateComponents minute]];
[currentDateToMidnight setSecond:-[currentDateComponents second]];
NSDate *midnight = [calendar dateByAddingComponents:currentDateToMidnight toDate:currentDate options:0];
NSTimeInterval todayTimeInterval = [midnight timeIntervalSince1970];