ios怎麼判斷日期是周末？

ios怎麼判斷日期是周末？

- (NSString *)calculateWeek:(NSDate *)date{    //計算week數    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 @"";}