获取上周的周一和周日的时间

-(NSString *)getLastMondayTime{

    

    NSDate *nowDate = [NSDate date];

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *comp = [calendar components:NSYearCalendarUnit| NSDayCalendarUnit|NSWeekdayCalendarUnit|NSDayCalendarUnit fromDate:nowDate];

    

    //获取今天是周几

    NSInteger weekDay = [comp weekday];

    //获取某天是几号

    NSInteger day = [comp day];

    

    //计算当前日期和上周的星期一和星期天相差天数

    long firstDiff,lastDiff;

    if (weekDay == 1) {

        

        firstDiff = -13;

        lastDiff = 0;

    }

    else{

        

        firstDiff = [calendar firstWeekday] - weekDay +1-7;

        lastDiff = 8 - weekDay;

    }

    

    //在当前日期基础上加上时间差的天数

    NSDateComponents *firstDayComp = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:nowDate];

    [firstDayComp setDay:day + firstDiff];

    NSDate *firstDayOfWeek = [calendar dateFromComponents:firstDayComp];

    

    NSDateComponents *lastDayComp = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:nowDate];

    [lastDayComp setDay:day + lastDiff];

    NSDate *lastDayOfWeek = [calendar dateFromComponents:lastDayComp];

    

    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];

    [formatter setDateFormat:@"MM月dd日"];

    NSString *firstDay = [formatter stringFromDate:firstDayOfWeek];

    NSString *lastDay = [formatter stringFromDate:lastDayOfWeek];

    

    NSString *dateStr = [NSString stringWithFormat:@"%@-%@",firstDay,lastDay];

    

    return dateStr;

}