iphone - 将表格 View 单元格滚动出 View 时，单元格文本会更改

Question

我有一个 UITableView，我以编程方式向单元格添加了两个按钮。 1 个按钮添加到单元格文本(向上计数)，另一个按钮减去 1(向下计数)。但是，假设我加 4，单元格的文本将为 4 ，但是当我将该单元格向上滚动并移出 View 时，当它向下返回到 View 中时，单元格文本返回到 1这是它开始的地方。如果我添加(如果我也减去它也一样)到单元格文本并切换页面然后返回到表格 View ，也会发生同样的情况。这是 cellForRow :

    - (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];
         newBtn = [[UIButton alloc]init];
         newBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
         [newBtn setFrame:CGRectMake(260,20,55,35)];
         [newBtn addTarget:self action:@selector(subtractLabelText:) forControlEvents:UIControlEventTouchUpInside];
         [newBtn setTitle:@"-" forState:UIControlStateNormal];
         [newBtn setEnabled:YES];
         [cell addSubview:newBtn];

         subBtn = [[UIButton alloc]init];
         subBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
         [subBtn setFrame:CGRectMake(200,20,55,35)];
         [subBtn addTarget:self action:@selector(addLabelText:) forControlEvents:UIControlEventTouchUpInside];
         [subBtn setTitle:@"+" forState:UIControlStateNormal];
         [subBtn setEnabled:YES];
         [cell addSubview:subBtn];
    } 
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    cell.imageView.image = [imageArray objectAtIndex:indexPath.row];    
    cell.textLabel.text = [cells objectAtIndex:indexPath.row];

return cell;
}

感谢任何帮助!谢谢:D

按钮的方法

    - (IBAction)addLabelText:(id)sender{    
    cell = (UITableViewCell*)[sender superview];    
    cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] +1];
}  

- (IBAction)subtractLabelText:(id)sender
{
    cell = (UITableViewCell*)[sender superview];        
    if ( [[cell.textLabel text] intValue] == 0){ 
        cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] +0];
    }
    else{
        cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] -1];
        //[myTableView reloadData];

    }
}

Answer 1

您需要这样的东西，您将值存储在单元格外部。这是因为细胞会被重复使用，不适合长期储存。

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

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
     {

         subBtn = [[UIButton alloc]init];
         subBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
         [subBtn setFrame:CGRectMake(200,20,55,35)];
         [subBtn addTarget:self action:@selector(addLabelText:indexPath.row) forControlEvents:UIControlEventTouchUpInside];
         [subBtn setTitle:@"+" forState:UIControlStateNormal];
         [subBtn setEnabled:YES];
         [cell addSubview:subBtn];
    } 

    // we're loading the value from the array each time the cell is displayed.
    cell.textLabel.text = [cellLabelValues objectAtIndex:indexPath.row];

return cell;
}

 - (IBAction)addLabelText:(int)currentRow{    
     NSString *newValue = [NSString stringWithFormat:@"%d",[[[cellLabelValues objectAtIndex:currentRow] intValue] +1];
    // we update the value in the array since this is the source of the data for the cell
    [cellLabelValues replaceObjectAtIndex:currentRow withObject:newValue];
    // now reload to get the new value
    [myTableView reloadData];
}