iphone - 表格 View 上下滚动时单元格顺序发生变化

Question

我正在为 iphone 应用程序做一个注册表。在那里有一个包含四个部分的表格 View 。在最后一节中有一行带有注册按钮。我很好地得到了带有数据的表格 View 。但是在上下滚动表格 View 时，我的注册按钮转到了第二部分。我添加了下面的代码.我做错了什么。帮我解决一下。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath 
  {
    // static NSString *CellIdentifier = @"Cell";
    // UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
       NSString *identifier = @"reuseIdentifier";
       UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

if (cell == nil)
{
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];
    cell.selectionStyle = UITableViewCellSelectionStyleGray;

    NSLog(@" row and  section =====  %d,%d",indexPath.row,indexPath.section);
    if(indexPath.section != 3)
    {
        UILabel *lbl_title = [[UILabel alloc] initWithFrame:(isiPad?CGRectMake(7,10,250,50):CGRectMake(70,40,340, 35))];
        [lbl_title setFont:[UIFont fontWithName:@"Verdana-Bold" size:(isiPad?20:13)]];
        lbl_title.backgroundColor = [UIColor clearColor];
        [lbl_title setTextColor:[UIColor blackColor]];

        lbl_title.tag = ((indexPath.section+1)*10)+indexPath.row;
        //NSLog(@"lbl data tag   %d",lbl_title.tag);

        lbl_title.textAlignment = UITextAlignmentLeft;
        [cell.contentView addSubview:lbl_title];    

        UILabel *lbl_data = [[UILabel alloc] initWithFrame:(isiPad?CGRectMake(260,10,410,50):CGRectMake(70,40,340, 35))];
        [lbl_data setFont:[UIFont fontWithName:@"Verdana-Bold" size:(isiPad?20:13)]];
        lbl_data.backgroundColor = [UIColor clearColor];//25-25-112
        [lbl_data setTextColor:[UIColor colorWithRed:25.0/255.0 green:25.0/255.0 blue:112.0/255.0 alpha:1.0]];
        lbl_data.textAlignment = UITextAlignmentCenter;
        lbl_data.tag = ((indexPath.section+1)*100)+indexPath.row;
        //NSLog(@"lbl data tag   %d,%@",lbl_data.tag,lbl_data);
        [cell.contentView addSubview:lbl_data];  

        if(indexPath.section == 0)
        {
            if(indexPath.row == 0)
            {
                lbl_title.text = @"Email";
            }
            else if(indexPath.row == 1)
            {
                lbl_title.text = @"Password";

            }
            else if(indexPath.row == 2)
            {
                lbl_title.text = @"Confirm password";
            }
        }
        else if(indexPath.section == 1)
        {
            if(indexPath.row == 0)
            {
                lbl_title.text = @"First name";
            }
            else if(indexPath.row == 1)
            {
                lbl_title.text = @"Last name";

            }
            else if(indexPath.row == 2)
            {
                lbl_title.text = @"Nickname";
            }
            else if(indexPath.row == 3)
            {
                lbl_title.text = @"Gender";
            }            
        }
        else if(indexPath.section == 2)
        {
            if(indexPath.row == 0)
            {
                lbl_title.text = @"City";
            }
            else if(indexPath.row == 1)
            {
                lbl_title.text = @"State";

            }
            else if(indexPath.row == 2)
            {
                lbl_title.text = @"Country";
            }
        }

    }
    if(indexPath.section == 3)
    {
        if(indexPath.row == 0)
        {
        cell.backgroundColor = [UIColor colorWithRed:165.0/255.0 green:42.0/255.0 blue:42.0/255.0 alpha:1.0];//165-42-42
      UIButton *btn_register = [[UIButton alloc] initWithFrame:isiPad?CGRectMake(10,0,660,70):CGRectMake(0,0,320,40)];
        [btn_register addTarget:self action:@selector(btn_register_clicked:) forControlEvents:UIControlEventTouchUpInside];
        [btn_register setTitle:@"Register" forState:UIControlStateNormal];
        //btn_register.titleLabel.textAlignment = UITextAlignmentCenter;
         btn_register.backgroundColor =  [UIColor blueColor];
        [btn_register setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [btn_register setFont:[UIFont fontWithName:@"Verdana-Bold" size:24]];
        [cell.contentView addSubview:btn_register];
        }
    }

}
else
{
    NSLog(@"updating cell.........");
} 
  return cell;

  }

Answer 1

它会重复，因为您将它添加到单元格的内容 View 中，然后您重新使用该单元格。不要将它添加到单元格的 contentView 中，而是将按钮添加为单元格附件。

cell.accessoryView = btn_register;

在所有其他单元格中，将 accessoryView 设置为 nil。

cell.accessoryView = nil;