Prepend application name to site title in Yii2

Controller.php

<?php
/**
 * Extension of base controller.
 * Add additional controller functions and vars here.
 */

namespace app\components;

use Yii;

class Controller extends \yii\web\Controller
{
    /**
     * {@inheritdoc}
     */
    public function init() 
    {
        // Prepend application name to site title
        $this->view->on('afterRender', function($event) 
        {
            if(!empty(Yii::$app->view->title)) 
            {
                Yii::$app->view->title = Yii::$app->name . Yii::$app->params['titleSeparator'] . Yii::$app->view->title;
            } 
            else 
            {
                Yii::$app->view->title = Yii::$app->name;
            }
        });
    }
}

index.php

<?php
/* @var $this yii\web\View */
$this->title = 'test';
?>

params.php

<?php
return [
    'adminEmail' => 'admin@example.com',
    'titleSeparator' => ' – ',
];

SiteController.php

<?php
namespace app\controllers;

use Yii;
use app\components\Controller;

class SiteController extends Controller
{
    /**
     * Displays homepage.
     *
     * @return string
     */
    public function actionIndex()
    {
        return $this->render('index');
    }
}