iOS--當cell上顯示不同數量圖片的時候重用

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //標識符
    static NSString *iden = @"cardsCell";
    CardsCell *cell = [tableView dequeueReusableCellWithIdentifier:iden];
    Cards *cards = [self.cardsArr objectAtIndex:indexPath.row];
   //cell為空就創建
    if (cell == nil) {
        cell = [[CardsCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden];
    }else {   //如果存在cell需要把之前添加的會變化的控件刪除
        //刪除cell上添加的圖片
        [cell.photoGroup removeFromSuperview];
    }

    cell.cards = cards;;
    
    return cell;
}

在自定義cell里

- (void)setCards:(Cards *)cards {
    if (_cards != cards) {
        _cards = cards;
    }
    //給cell控件賦值
    [self.avaImageView sd_setImageWithURL:[NSURL URLWithString:_cards.avaImageUrl] placeholderImage:[UIImage imageNamed:@"72tx.png"]];
    self.usernameLabel.text = _cards.username;
    self.commentLabel.text = [NSString stringWithFormat:@"%ld",_cards.replyArr.count];
    self.titleLabel.text = _cards.title;
    self.timeLabel.text = _cards.time;
    self.contextLabel.text = _cards.context;
    //判斷圖片數組數量，大於0就根據數量創建，否則不創建
    if (_cards.imageArr.count > 0) {
        //圖片瀏覽，用了一個圖片瀏覽器SDPhotoGroup，繼承UIView
        self.photoGroup = [[SDPhotoGroup alloc] initWithFrame:CGRectMake1(0, 100, 105*_cards.imageArr.count, 60)];
        NSMutableArray *temp = [NSMutableArray array];
        [_cards.imageArr enumerateObjectsUsingBlock:^(NSString *src, NSUInteger idx, BOOL *stop) {
            SDPhotoItem *item = [[SDPhotoItem alloc] init];
            item.thumbnail_pic = src;
            [temp addObject:item];
        }];
        self.photoGroup.photoItemArray = [temp copy];
        [self.contentView addSubview:self.photoGroup];
    }
}