cell.textLabel.text减去1会导致应用程序崩溃

Question

您可以从我的cell.textLabel.text中添加和减去1。我用这种方法加1：

  - (IBAction)addLabelText:(id)sender{
     num = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] +1];
     number = [[NSMutableArray alloc]initWithObjects:num, nil];
     [myTableView reloadData];
}

我无法得到要减去的textLabel！这是我的方法：

    - (IBAction)subtractLabelText:(id)sender
{
     if ( [[cell.textLabel text] intValue] == 0){  
     num = [NSString stringWithFormat:@"%d",[num intValue] +0];
     [number addObject:num];
     }
     else{
     num = [NSString stringWithFormat:@"%d",[num intValue] -1];
     [number addObject:num];
     }
}

在我的cellForRowAtIndexPath方法中，我试图用以下行设置标签的文本：

    cell.textLabel.text = [number objectAtIndex:indexPath.row];

+按钮有效，但-按钮无效。我该怎么解决这个问题？提前感谢！

蜂窝

 - (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];
         addBtn = [[UIButton alloc]init];
         addBtn =[UIButton buttonWithType:UIButtonTypeRoundedRect];
         [addBtn setFrame:CGRectMake(220,10,25,55)];
         [addBtn addTarget:self action:@selector(addLabelText:) forControlEvents:UIControlEventTouchUpInside];
         [addBtn setTitle:@"+" forState:UIControlStateNormal];
         [addBtn setEnabled:YES];
         [cell addSubview:addBtn];
         subBtn = [[UIButton alloc]init];
         subBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
         [subBtn setFrame:CGRectMake(260,10,25,55)];
         [subBtn addTarget:self action:@selector(subtractLabelText:) forControlEvents:UIControlEventTouchUpInside];
         [subBtn setTitle:@"-" forState:UIControlStateNormal];
         [subBtn setEnabled:YES];
         [cell addSubview:subBtn];
         //cell.textLabel.text = @"1";
     } 
    //cellText.hidden=!self.editing;
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    cell.imageView.image = [imageArray objectAtIndex:indexPath.row];  
    cell.textLabel.text = [number objectAtIndex:indexPath.row];

return cell;
}

Answer 1

它将崩溃，因为该单元格与您的+和-按钮所在的单元格不同
您必须获得单击"+"或"-"按钮的"UITableViewCell"。然后根据需要操作文本。