- (NSString *)calculateWeek:(NSDate *)date{            //计算week数            NSCalendar * myCalendar = [NSCalendar currentCalendar];            myCalendar.timeZone = [NSTimeZone systemTimeZone];            NSInteger week = [[myCalendar components:NSWeekdayCalendarUnit fromDate:date] weekday];            NSLog(@"week : %zd",week);            switch (week) {                case 1:                {                    return @"周日";                }                case 2:                {                    return @"周一";                }                case 3:                {                    return @"周二";                }                case 4:                {                    return @"周三";                }                case 5:                {                    return @"周四";                }                case 6:                {                    return @"周五";                }                case 7:                {                    return @"周六";                }            }                        return @"";        }