星期判断

/**  是否为周末  */
+ (BOOL)isWeekday
{
    NSInteger year,month,day,hour,min,sec,week;

    NSString *weekStr=nil;

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    NSDate *now = [NSDate date];;

    NSDateComponents *comps = [[NSDateComponents alloc] init];

    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit |

    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

    comps = [calendar components:unitFlags fromDate:now];

    year = [comps year];

    week = [comps weekday];

    month = [comps month];

    day = [comps day];

    hour = [comps hour];

    min = [comps minute];

    sec = [comps second];

    BOOL isWeekend = NO;

    if(week == 1){
        weekStr=@"星期天";

        isWeekend = YES;
    }else if(week == 2){

        weekStr=@"星期一";
    }else if(week == 3){

        weekStr=@"星期二";
    }else if(week == 4){

        weekStr=@"星期三";
    }else if(week==5){

        weekStr=@"星期四";
    }else if(week == 6){

        weekStr=@"星期五";
    }else if(week == 7){

        weekStr=@"星期六";

        isWeekend = YES;
    }
    NSLog(@"现在是:%ld年%ld月%ld日 %ld时%ld分%ld秒  %@", (long)year,(long)month,(long)day,(long)hour,(long)min,(long)sec,weekStr);

    return isWeekend;
}