1.设置一个标记来记录选中的行数

@property (nonatomic, strong) NSIndexPath *selectPath; //存放被点击的哪一行的标志

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath,记录下之前选择的单元格，并且实时更新

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    int newRow = (int)[indexPath row];
    int oldRow = (int)(_selectPath != nil) ? (int)[_selectPath row]:-1;
    if (newRow != oldRow)
    {
        UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
        newCell.accessoryType = UITableViewCellAccessoryCheckmark;
        
        UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:_selectPath];
        oldCell.accessoryType = UITableViewCellAccessoryNone;
        _selectPath = [indexPath copy];
    }
    
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    
   // [self.navigationController popViewControllerAnimated:YES];
}

4.然后在- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath方法中实现

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier"];
    
    if (!cell)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"reuseIdentifier"];
    }
    
    if (_selectPath == indexPath)
    {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else
    {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }    
    cell.textLabel.text = self.languageArr[indexPath.row];
    return cell;
}

补充：可以在cellForRowAtIndexPath:(NSIndexPath *)indexPath补充实现默认选中某一具体的行