Question

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didselectedrowAtindex方法table_option UITableView中的代码selectedcells 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];

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Answer 1

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。请在您的cellForRowAtIndexPath方法中写下以下代码，它将解决问题。

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

Answer 2

就我而言，仅在accessoryType = UITableViewCellAccessoryCheckmark中设置cellForRowAtIndexPath并不起作用。

当UITableView到达其第一个元素时发生问题，如果您尝试滚动更多元素，则可见单元格会关闭，其复选标记将消失。

NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];

[cell setAccessoryType:UITableViewCellAccessoryNone];// tricky part is this line

if ( [selectedCells containsObject:rowNsNum]  )
{
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
    cell.accessoryType = UITableViewCellAccessoryNone;
}

Answer 3

检查此示例

cell.accessoryType = UITableViewCellAccessoryNone;
 for (int x = 0; x < selectedIds.count; x++) {
     if ([[selectedIds objectAtIndex:x] isEqualToString:[[source objectAtIndex:[indexPath row]] objectForKey:@"id"]])
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
 }

UITableview配件类型在滚动时消失

3 个答案: