获取当前一周的日期

遇到一个需求，需要把当前一周的日期展现出来，效果如图

Paste_Image.png

参考链接:

#pragma mark 获取当前一周的时间
- (void)getCurrentWeek
{
    NSDate *now = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday
                                         fromDate:now];
    // 得到星期几
    // 1(星期天) 2(星期二) 3(星期三) 4(星期四) 5(星期五) 6(星期六) 7(星期天)
    NSInteger weekDay = [comp weekday];
    // 得到几号
    NSInteger day = [comp day];
    
    NSLog(@"weekDay:%ld day:%ld",weekDay,day);
    
    // 计算当前日期和这周的星期一和星期天差的天数
    long firstDiff,lastDiff;
    if (weekDay == 1) {
        firstDiff = 1;
        lastDiff = 0;
    }else{
        firstDiff = [calendar firstWeekday] - weekDay;
        lastDiff = 7 - weekDay;
    }
    
    self.currentWeekArray = [[NSMutableArray alloc] init];
    for (NSInteger i = firstDiff; i < lastDiff + 1; i ++) {
        //从现在开始的24小时
        NSTimeInterval secondsPerDay = i * 24*60*60;
        NSDate *curDate = [NSDate dateWithTimeIntervalSinceNow:secondsPerDay];               
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"dd"];
        NSString *dateStr = [dateFormatter stringFromDate:curDate];//几号
        [self.currentWeekArray addObject:dateStr];
    }
}