Question

ReadFile

此代码显示错误......控制可能达到无效功能......我应该返回什么...哪里出错了？

Answer 1

您需要在其他地方再定义一个条件，例如

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *cellIdentifier  = @"cellWithTextField";
    static NSString *cellIdentifier1 = @"cellWithLabel";
    static NSString *cellIdentifier2 = @"cell";

    if (indexPath.section == 0) {
        UserDetailCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        cell = [tableView dequeueReusableCellWithIdentifier:@"cellWithTextField"];
        cell.userDetailLabel.text  = [userDetail objectAtIndex:indexPath.row];
        return cell;
    }
    else if (indexPath.section == 1) {
        DetailCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier1];
        cell = [tableView dequeueReusableCellWithIdentifier:@"cellWithLabel"];
        cell.userInfoLabel.text  = [userInfo objectAtIndex:indexPath.row];
        return cell;
    }
    else if (indexPath.section == 2)
    {
        NewControllerCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier2];
        cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
        cell.detailLabel.text  = [detail objectAtIndex:indexPath.row];
        return cell;
    } else {
        // Some code to return default cell or return nil 
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        return cell;
    }

}

Answer 2

回到零。如果你的代码能正常运行＆＃34;返回nil＆＃34;将永远不会执行第0部分（零） - 2。

Answer 3

您只需在功能结束时添加return nil 所以你的代码看起来像这样：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *cellIdentifier  = @"cellWithTextField";
  static NSString *cellIdentifier1 = @"cellWithLabel";
  static NSString *cellIdentifier2 = @"cell";

  if (indexPath.section == 0)   
  {
    UserDetailCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    cell.userDetailLabel.text  = [userDetail objectAtIndex:indexPath.row];
    return cell;
 }  

 else if (indexPath.section == 1)   
 {
    DetailCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier1];
    cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier1];
    cell.userInfoLabel.text  = [userInfo objectAtIndex:indexPath.row];
    return cell;
 }  

 else if (indexPath.section == 2)
 {
     NewControllerCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier2];
     cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier2];
     cell.detailLabel.text  = [detail objectAtIndex:indexPath.row];
     return cell;
 }

 // You can return here default cell or nil 
 return nil;

}

多个自定义单元格 - 代码中的错误

3 个答案: