Extending BaseController gives error

Hi.
I'm trying to use some code from CI 3 and got a error, where I can't use the provided variables to load views by template.
The error is just the site isn't loading.

This is the code I would like to use in CI 4:

PHP Code:

<?php
class GE_Controller extends CI_Controller
{
    protected $_viewData = [];
    protected $loginData = '';

    /**
    * ste footer and header
    * @param none
    * @return constructor
    **/
    function __construct()
    {
        parent::__construct();

        //load header
        $this->_viewData['message'] = $this->session->flashdata('message');
        $this->_viewData['header'] = $this->load->view('parts/header', $this->_viewData, true);
    }
}

class MY_Controller extends GE_Controller
{
    /**
    * ste footer and header
    * @param none
    * @return constructor
    **/
    function __construct()
    {
        parent::__construct();

        $uri = $_SERVER['REQUEST_URI'];
        $s = $this->session->get_userdata();

        $ok = isset($s['user']);

        if($ok)
        {
            $this->loginData = $s['user'];
            $this->_viewData['loginData'] = $this->loginData;
        }

        $this->_viewData['footer'] = $this->load->view('parts/footer', $this->_viewData, true);

    }
} 


I've used the _viewData to load views by the template.
One of my old, I mean CI 3, controllers:

PHP Code:

defined('BASEPATH') OR exit('No direct script access allowed');

class Main extends MY_Controller {

    public function index(){

            $this->_viewData['logo'] = $this->load->view('logo', $this->_viewData, true);
            $this->_viewData['content'] = $this->load->view('login', $this->_viewData, true);
            $this->load->view('parts/template', $this->_viewData);
        }
    }
} 


The template code:

PHP Code:

<?=$header?>


<? if(!empty($logo)):?>
<?=$logo ; ?>

<?php
//show menu if any
if(isset($menu) && !empty($menu)) echo $menu; ?>

<?php
//show message if any
if (isset($message) && !empty($message))
    echo "<div class='uk-alert'>".$message."</div>";?>
<? if(!empty($content)): ?>

    <?=$content ;?>
<? endif; ?>

<?=$footer?>

I really like this method of constructing the site, so could you help me make it work?
Hope you will help me . Thanks a lot.

I'm just getting started with this myself, but I can say that a huge amount has changed from CI3 to CI4 - code for version 3 will rarely, if ever, work in the new version! I'm trying to update an old site, and I'm finding that basically everything has to be redone. Learning as I go!

CI 4 comes with a BaseController that is what you would use,
think of the BaseController as the MY_Controller

Add what you need add to the BaseController then extend all your other controllers
from it.

Oh, Do Not call the parent::__construct() there is no constructor in the Controller

It uses an initController() method instead.
(

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

Sorry for the late reply.
I tryed using the initController in the BaseController to recreate what I had in CI3 but that doesn't work.
Is it still possible to pass a view to a variable like in CI3?
For example:

PHP Code:

$this->_viewData['header'] =  view('parts/header', $this->_viewData, true); 


And than echo it in a template?