Try this I hope it will help you

Install Composer and run the following command to get the latest version:

composer require "twig/twig:^3.0"

Then after installation add this line of code to the baseController initController method just after the parent::initController, just like the code below

namespace App\Controllers;

use CodeIgniter\Controller;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use Psr\Log\LoggerInterface;

class BaseController extends Controller
{
    protected $helpers = [];
    protected $twig;

    // protected $helper = [];
    public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
    {
        parent::initController($request, $response, $logger);
        
        $appPaths = new \Config\Paths();
        $appViewPaths = $appPaths->viewDirectory;

        $loader = new \Twig\Loader\FilesystemLoader($appViewPaths);

        $this->twig = new \Twig\Environment($loader, [
            'cache' => WRITEPATH.'/cache/twig',
        ]);

    }
}

So with this now you can call the view files in other controllers extends to parent controller BaseController e.g

namespace App\Controllers;


class Home extends BaseController
{
    public function index ()
    {        
        // To load a template from a Twig environment, call the load() method which returns a \Twig\TemplateWrapper instance:

       $template = $this->twig->load('index.html');
       
       // To render the template with some variables, call the render() method:

       return $template->render(['the' => 'variables', 'go' => 'here']);
       
       // The display() method is a shortcut to output the rendered template.
       // OR You can also load and render the template in one fell swoop:

       return $this->twig->render('index.html', ['the' => 'variables', 'go' => 'here']);

       // If a template defines blocks, they can be rendered individually via the renderBlock() call:

       return $template->renderBlock('block_name', ['the' => 'variables', 'go' => 'here']);

       // Note any of them above will work
    }
}

If you still want to use view() with twig like codeigniter 4 default view function you can modify the Common.php file in app directory by adding this block of code below.

if (!function_exists('view'))
{
    function view($tpl, $data = []) {

       $appPaths = new \Config\Paths();
        $appViewPaths = $appPaths->viewDirectory;

        $loader = new \Twig\Loader\FilesystemLoader($appViewPaths);

        $twig = new \Twig\Environment($loader, [
            'cache' => WRITEPATH.'/cache/twig',
        ]);

        if (!stripos($tpl, '.twig')) {
           $tpl = $tpl . '.twig';
        }

        return $twig->render($tpl, $data);
    }
}

Then in controller call it like this

return view('index', ['name' => 'Chibueze Agwu'])

Then in view file index.twig

<!DOCTYPE html>
<html>
    <head>
        <title>My Webpage</title>
    </head>
    <body>
        <h1>My Webpage</h1>
        {{ name }}
    </body>
</html>

This will output

My Webpage
Chibueze Agwu

I haven't test this code but I hope it will work. If not call my attentions. In order to obey the the rule of DRY (DO NOT REPEAT YOURSELF), you can go ahead to improve the code I will do that later

I found the solution some time ago and I'm posting it in case some people stumble across the question.

1. First of all, all your controllers must extend BaseController; this controller is available by default when you install CodeIgniter 4.

2. Create a custom helper file and put in [project-name]/appstarter/app/Helpers.

IMPORTANT

• the name of your helper must be [name]_helper.php or it will not work!

for example mine is called custom_helper.php

3. Create the following function in the custom helper you just created:

    use Twig\Environment;
    use Twig\Extension\DebugExtension;
    use Twig\Loader\FilesystemLoader;
    use Twig\TwigFilter;
   
    if (!function_exists('twig_conf')) {
        function twig_conf() {
            // the follwing line of code is the only one needed to make Twig work
            // the lines of code that follow are optional
            $loader = new FilesystemLoader('Views', '../app/');
   
            // to be able to use the 'dump' function in twig files
            $twig = new Environment($loader, ['debug' => true]);
            $twig->addExtension(new DebugExtension());
   
            // twig lets you create custom filters            
            $filter = new TwigFilter('_base_url', function ($asset) {
                return base_url() . '/' . $asset;
            });
            $twig->addFilter($filter);
   
            return $twig;
        }
    }
   

NOTE

• before creating any custom filter, make sure Twig doesn't already has one built-in.

4. Now in the BaseController you'll find an empty array called $helpers. You must put the name of your custom helper in it. Mine is called custom_helper.php; so the code looks like this for me:

   protected $helpers = ['custom'];
   

5. Just below the array you'll find the constructor for BaseController and this is where the Twig library will be initialized; by calling the function you created in your custom helper:

   public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger) {      
       parent::initController($request, $response, $logger);
   
       $this->twig = twig_conf();
   }
   

6. Now you are good to go! To render your twig files in any controller:

   return $this->twig->render('twig_name', $dataArray);
   

Try this I hope it will help you.

Install Composer and run the following command to get the latest version:

composer require "twig/twig:^3.0"