ios-通過NSCalendar來擷取目前時間的年、月、日、時、分、秒

void getDate(){    // 通過NSDate擷取目前時間    NSDate *now = [NSDate date];    NSLog(@"Now date is: %@", now);        // 通過NSCalendar來過濾目前時間    NSCalendar *calendar = [NSCalendar currentCalendar];    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];        int year = [dateComponent year];    int month = [dateComponent month];    int day = [dateComponent day];    int hour = [dateComponent hour];    int minute = [dateComponent minute];    int second = [dateComponent second];        NSLog(@"year is: %d", year);    NSLog(@"month is: %d", month);    NSLog(@"day is: %d", day);    NSLog(@"hour is: %d", hour);    NSLog(@"minute is: %d", minute);    NSLog(@"second is: %d", second);}