Question

我有一个表格视图。我可以添加和删除单元格。免得说我添加5.当我离开表视图（切换视图），并返回到表视图时，单元格消失了。为什么会这样？另外，我怎么能解决这个问题？谢谢！

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
     {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

         stepper = [[UIStepper alloc]init];
         [stepper setFrame:CGRectMake(216, 22, 100, 30)];
         NSLog(@"the stepper is %@", stepper);
         [cell addSubview:stepper];

         cellLabel = [[UILabel alloc]init];
         [cellLabel setFrame:CGRectMake(65, 22, 27, 27)];
         [cellLabel setText:@"1"];
         [cell.contentView addSubview:cellLabel];
    } 
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    cell.imageView.image = [imageArray objectAtIndex:indexPath.row];    
   // cell.textLabel.text = [cells objectAtIndex:indexPath.row];
    if ([cell.imageView.image  isEqual:[UIImage imageNamed:@"paddle5.png"]]) {
        [cellLabel setFrame:CGRectMake (175, 22, 30, 30)];
    }
    if ([cell.imageView.image  isEqual:[UIImage imageNamed:@"paddle4.png"]]) {
        [cellLabel setFrame:CGRectMake (150, 22, 30, 30)];
    }
    if ([cell.imageView.image  isEqual:[UIImage imageNamed:@"paddle3.png"]]) {
        [cellLabel setFrame:CGRectMake (120, 22, 30, 30)];
    }
    if ([cell.imageView.image  isEqual:[UIImage imageNamed:@"paddle2.png"]]) {
        [cellLabel setFrame:CGRectMake (90, 22, 30, 30)];
    }
return cell;
}

NumberOfRows

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [cells count];
}

CommitEditingStyle：

- (void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle 
 forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        [[self cells] removeObjectAtIndex:[indexPath row]];
        [[self imageArray]removeObjectAtIndex:[indexPath row]];

        NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
        [[self myTableView] deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
    }
}

Answer 1

看起来tableView:commitEditingStyle:forRowAtIndexPath:的代码缺少插入操作的部分：

else if (editingStyle == UITableViewCellEditingStyleInsert) {
    [[self imageArray] insertObject:... atIndex:...];
}

如果没有此代码，当您切换并返回时，imageArray只有旧对象。您还应该在方法结束时从模型重新加载数据：

[tableView reloadData];

当表离开然后返回时，UITableView单元格消失

1 个答案: