Question

当用户在表视图中选择行时，我正在尝试向项添加复选标记。但是，视图未刷新且复选标记不显示：

- (void)tableView:(UITableView *)tv didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell* oldCell = [self tableView:tv cellForRowAtIndexPath:[NSIndexPath indexPathForRow:selectedIndex inSection:0]];
    oldCell.accessoryType = UITableViewCellAccessoryNone;

    if (indexPath.section == 0) {
        selectedIndex = indexPath.row;
    }

    UITableViewCell* newCell = [self tableView:tv cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;

    [tv deselectRowAtIndexPath:indexPath animated:NO];
}

这可能是什么原因？

Answer 1

直接在tv对象上调用cellForRowAtIndexPath而不是通过self来确保获得正确的单元格引用：

- (void)tableView:(UITableView *)tv didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *oldCell = [tv cellForRowAtIndexPath:[NSIndexPath indexPathForRow:selectedIndex inSection:0]];
    oldCell.accessoryType = UITableViewCellAccessoryNone;

    if (indexPath.section == 0) {
        selectedIndex = indexPath.row;
    }

    UITableViewCell *newCell = [tv cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;

    [tv deselectRowAtIndexPath:indexPath animated:NO];
}

还要确保在cellForRowAtIndexPath中有这样的逻辑：

...
if (indexPath.row == selectedIndex)
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
else
    cell.accessoryType = UITableViewCellAccessoryNone;
...
return cell;

否则，在滚动屏幕后，单元格将保留在单元格上，即使您选择了另一个单元格，也会返回到屏幕上。

UITableView中的附件视图：视图不会更新

1 个答案: