在UITableView中添加多个自定义单元格 [英] Adding multiple custom cells in UITableView

问题描述

虽然这是最常问的问题之一，但我找不到一个全面的答案。我需要在UITableView中有自定义单元格。一些包含标签或文本字段，一些包含图像和按钮。我为每种类型的细胞制作了单独的类。我正在使用具有多个部分的GroupStyle表。现在我在cellForIndexPath中添加了switch，case为section，if-else为section in section：

Though this is one of the most asked question but i could not find one comprehensive answer. I need to have custom cells in UITableView. Some containing labels or text fields and some with images and buttons. I have made separate classes for each type of cell. I am using GroupStyle table with multiple sections. Right now I am adding cells in cellForIndexPath with switch-case for section and if-else for rows in section:

id cell;
switch(indexPath.section) {
    case 0:
           if(indexPath.row==0) {
               CellA *cell = [[[CellA alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[NSString stringWithFormat:@"Celld%",indexPath.row]] autorelease];
               //configure cell
               return cell;
           }
           else if(indexPath.row==1) {
               CellB *cell = [[[CellB alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[NSString stringWithFormat:@"Celld%",indexPath.row]] autorelease];
               //configure cell
               return cell;
           }
           break;
    case 1:
           if(indexPath.row==0) {
               CellC *cell = [[[CellC alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[NSString stringWithFormat:@"Celld%",indexPath.row]] autorelease];
               //configure cell
               return cell;
           }
           break;
    default:
            break;
}
return cell;

我也必须在最后返回单元格，因为由于代码块内的单元格的定义，单元格变得无法辨认。为了解决这个问题，我在顶部声明了id的单元格。但我知道这不是正确的方法。如何解决此声明并访问多种类型单元格的问题？

I have to return cell at the end as well because due to definition of cells inside code blocks, cell becomes unrecognizable. To solve it, i declared cell with id on top.But i know this is not the right way. How can I resolve this declare and access issue of multiple types of cells?

目前有4-5行适合一个屏幕而不需要滚动。所以，我不是在重复使用细胞。但是在编辑时会挤出更多行。在另一个表中，有更多行可以滚动屏幕。这意味着我必须重复使用细胞。所以，我的问题的第二部分是;如何重复使用多个自定义单元格？

There are 4-5 rows at the moment which fit one screen and do not need scrolling. So, I am not reusing cells. But more rows will squeeze in while editing. And in another table, there are more rows which can scroll of the screen. This means I must reuse cells. So, second part of my question is; how can I reuse multiple custom cells?

推荐答案

要回答您的第一个问题，您也可以返回没有因为你没有很好的回报价值。如果遇到这种情况，将抛出异常;就像现在一样，它可能会在框架代码中的某处给你一个EXC_BAD_ACCESS。

To answer your first question, you may as well return nil as you have no good value to return. If it ever hits this case, an exception will be thrown; as it is now, it's likely to give you an EXC_BAD_ACCESS somewhere inside the framework code.

要回答你的第二个问题，每个类型的单元格应该有一个唯一的reuseIdentifier。例如，所有CellA都可以具有@CellA的reuseIdentifier。那么你将完全重用它们，就像你所有单元格相同的情况一样：当你需要一个CellA调用 [tableView dequeueReusableCellWithIdentifier：@CellA] 时，你需要一个CellB调用 [tableView dequeueReusableCellWithIdentifier：@CellB] ，依此类推。例如，

To answer your second question, each type of cell should have a unique reuseIdentifier. For example, all the CellA's could have a reuseIdentifier of @"CellA". Then you would reuse them exactly as you would in the case that all the cells were the same: when you need a CellA call [tableView dequeueReusableCellWithIdentifier:@"CellA"], when you need a CellB call [tableView dequeueReusableCellWithIdentifier:@"CellB"], and so on. For example,

    case 0:
        if (indexPath.row == 0) {
            CellA *cell = [tableView dequeueReusableCellWithIdentifier:@"CellA"];
            if (!cell) {
                cell = [[[CellA alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellA"] autorelease];
            }
            // configure cell
            return cell;
        }
        else if (indexPath.row == 1) {
            CellB *cell = [tableView dequeueReusableCellWithIdentifier:@"CellB"];
            if (!cell) {
                cell = [[[CellB alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellB"] autorelease];
            }
            // configure cell
            return cell;
        }
        break;
    case 1:
        if (indexPath.row == 0) {
            CellC *cell = [tableView dequeueReusableCellWithIdentifier:@"CellC"];
            if (!cell) {
                cell = [[[CellC alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellC"] autorelease];
            }
            // configure cell
            return cell;
        }
        break;

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