UITableview配件类型在滚动时消失 [英] UITableview accessory type disappear while scrolling

问题描述

我制作了一个tableView，我需要选择多个选项。选项被选中，但是当我滚动表格视图时，复选标记选项消失，其他一些行显示该复选标记。
这是我的代码 didselectedrowAtindex 方法 table_option 是 UITableView 和 selectedcells 是 NSMutableArray

I have made a tableView in which i need to select multiple options. The options are selected but when i scroll the table view the check mark option get disappear and some other rows displays that check mark. This is my code in didselectedrowAtindex method table_option is UITableView and selectedcells is NSMutableArray

[table_option deselectRowAtIndexPath:indexPath animated:YES];
NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
if ( [selectedCells containsObject:rowNsNum]  )
{
    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) 
        cell.accessoryType = UITableViewCellAccessoryNone;
    else 
        cell.accessoryType = UITableViewCellAccessoryCheckmark;



    [selectedCells removeObject:rowNsNum];
    sel.text=@"Select";
   // cell.accessoryType = UITableViewCellAccessoryNone;

}
    else 
{
    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) 
        cell.accessoryType = UITableViewCellAccessoryNone;
    else 
        cell.accessoryType = UITableViewCellAccessoryCheckmark;

    [selectedCells addObject:rowNsNum];
   sel.text=@"Selected";
   // cell.accessoryType = UITableViewCellAccessoryCheckmark;

}



[table_option reloadData];

请尽快帮助

推荐答案

您需要在 cellForRowAtIndexPath 方法中检查是否已选择单元格。出现此问题的原因是tableView重新使用单元格。
请在 cellForRowAtIndexPath 方法中写下以下代码，它将解决问题。

You need to check the cell is already selected or not in the cellForRowAtIndexPath method. This issue is happening because tableView re-uses the cells. Please write the below code in your cellForRowAtIndexPath method, it'll solve the issue.

NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
if ( [selectedCells containsObject:rowNsNum]  )
{
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
    cell.accessoryType = UITableViewCellAccessoryNone;
}

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