獲取一周的日期

-(NSArray *)adddDataOnViews
{
    NSDate *nowDate = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comp = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday | NSCalendarUnitDay fromDate:nowDate];
    // 獲取今天是周幾
    NSInteger weekDay = [comp weekday];
    // 獲取幾天是幾號
    NSInteger day = [comp day];
    // 計算當前日期和本周的星期一和星期天相差天數
    long firstDiff,lastDiff;
    // weekDay = 1;
    if (weekDay == 1)
    {
        firstDiff = -6;
        lastDiff = 0;
    }
    else
    {
        firstDiff = [calendar firstWeekday] - weekDay + 1;
        lastDiff = 8 - weekDay;
    }
    // NSLog(@"firstDiff: %ld lastDiff: %ld",firstDiff,lastDiff);
    // 在當前日期(去掉時分秒)基礎上加上差的天
    NSDateComponents *firstDayComp = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:nowDate];
    [firstDayComp setDay:day + firstDiff];
    NSDate *firstDayOfWeek = [calendar dateFromComponents:firstDayComp];
    NSDateComponents *lastDayComp = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:nowDate];
    [lastDayComp setDay:day + lastDiff];
    NSDate *lastDayOfWeek = [calendar dateFromComponents:lastDayComp];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"dd"];
    NSString *firstDay = [formatter stringFromDate:firstDayOfWeek];
    NSString *lastDay = [formatter stringFromDate:lastDayOfWeek];
     NSLog(@"%@=======%@",firstDay,lastDay);
    
    int firstValue = firstDay.intValue;
    int lastValue = lastDay.intValue;
    
    NSMutableArray *dateArr = [[NSMutableArray alloc]init];
    if (firstValue < lastValue) {
        
        for (int j = 0; j<7; j++) {
            NSString *obj = [NSString stringWithFormat:@"%d",firstValue+j];
            [dateArr addObject:obj];
        }
    }
    else if (firstValue > lastValue)
    {
        for (int j = 0; j < 7-lastValue; j++) {
            NSString *obj = [NSString stringWithFormat:@"%d",firstValue+j];
            [dateArr addObject:obj];
        }
        for (int z = 0; z<lastValue; z++) {

            NSString *obj = [NSString stringWithFormat:@"%d",z+1];
            [dateArr addObject:obj];
        }
    }
    return dateArr;

}