iOS下UITableView的单元格重用逻辑

终于有时间继续UITableView的接口调用顺序这篇文章了,之前测试过,模拟器都是按照height,cellForRow这样的顺序调用接口的,iOS8以前一直是这样,但是到了iOS8,这个顺序倒过来了这样倒是有好处,至少按照传统思路,单元格先创建,创建完成后就知道高度了.但这样怎么向下兼容呢,来试试这个粗略的办法.
在cellForRow,heightForRow两个接口中都调用一个函数,来创建单元格,但是要根据系统版本做判断区分

-(H5TableCell*)tableView:(UITableView *)tableView makeCellForRowAtIndexPath:(NSIndexPath *)indexPath mode:(BOOL)isOnCellCreate
{
    NSString* cellItemStyleNameStr = [self getCellStyle:indexPath];
    UIView* contentView = nil;
    H5TableCell  *cell = nil;
    if ((isOnCellCreate && ISIOS8) || (!isOnCellCreate && ISIOS7 && !ISIOS8))
    {
        cell =[tableView dequeueReusableCellWithIdentifier:cellItemStyleNameStr];
        if (cell==nil)
        {
            cell=[[H5TableCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellItemStyleNameStr];
            contentView = [self tableView:tableView viewForRowAtIndexPath:indexPath];
            [cell.contentView addSubview:contentView];
            cell.contentView.frame = CGRectMake(0, 0, contentView.frame.size.width, contentView.frame.size.height);
        }
        else
        {
            NSUInteger idx = [cellArray indexOfObject:cell];
            if (NSNotFound != idx)
            {
                NSIndexPath* reusedIndexPath = cell.IndexPath;
                //KCLog(@"复用%ld.%ld for %ld.%ld",reusedIndexPath.section,reusedIndexPath.row,indexPath.section,indexPath.row);
                
                //清除H5Core库登记的对该被复用indexPath单元的view登记
                NSString* windowKey = [NSString stringWithFormat:@"%@_%ld_%ld",
                                       cellItemStyleNameStr,
                                       (long)reusedIndexPath.section,
                                       (long)reusedIndexPath.row];
                //[[H5Core shareInstance] destroyH5CoreWindow:windowKey];
                [self.delegate destructionWindowName:windowKey];
                [cellArray removeObject:cell];
                [cellIdArray removeObjectAtIndex:idx];
            }
            else
            {
                KCLog(@"复用 未找到 for %ld.%ld",indexPath.section,indexPath.row);
            }
        }
        cell.IndexPath = indexPath;
        cell.delegate = self;
        cell.selectionStyle=UITableViewCellSelectionStyleNone;
        cell.backgroundColor=[UIColor clearColor];
        [cellArray addObject:cell];
        [cellIdArray addObject:indexPath];
    }
    else
    {
        //只是获取cell,因为已经创建过了
        NSUInteger idx = [cellIdArray indexOfObject:indexPath];
        if (NSNotFound != idx)
        {
            cell = [cellArray objectAtIndex:idx];
        }
        else
        {
            KCLog(@"非复用 未找到 for %ld.%ld",indexPath.section,indexPath.row);
        }
        
    }

    return cell;
}

目前没有发现有复用未找到的情况.