How to use public variables from controller in views in CI 4

Here is my controller:

PHP Code:

namespace App\Controllers;

use CodeIgniter\Controller;

class MY_Controller extends Controller {

    public $public_variable;

    public function __construct() {
        $this->public_variable = "Some value";
    }

    function index() {
        return view("my_folder/index");
    }

} 


I can't call it from the view file:
in views/my_folder/index.php

PHP Code:

<?php
echo $this->public_variable;
?>

Showing this error:

Code:

ErrorException

Undefined property: CodeIgniter\View\View::$public_variable

But in CI3, I could easily use it. What's wrong here?
I've to call the same thing everywhere mostly. So, I shouldn't pass the variable to view(). Isn't it?

Please provide any solution.
Thanks in advance.