I have a cookie variable mobile-application = "yes". I need to set a custom theme depends on this variable in magento2. I've already created a custom theme. How I can set it programmatically in runtime. In magento1 works this example:


Rewrite PHP code

  public function loadChange($storeId, $date = null)
        $result = $this->getResource()
            ->loadChange($storeId, $date);

        if (!empty($result)) {
            if (!empty($result['design'])) {
                $tmp = explode('/', $result['design']);
                $result['package'] = $tmp[0];
                $result['theme'] = $tmp[1];

        // your custom code goes here
        // custom condition
        if(true) {
            $result['package'] = 'default';
            $result['theme'] = 'modern';

        return $this;

Has anybody experience with this point for magetno2?


1 Answer 1


You can try the below code to update the theme on runtime in Magento 2.

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$objectManager->get(\Magento\Framework\View\DesignInterface::class)->setDesignTheme('Magento/luma', 'frontend'); //where Magento/luma is the theme name.

However, you can use the dependency injection in your custom module instead of the $objectManager.



<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="layout_load_before">
        <observer name="layout_load_before_custom" instance="Verndor\ModuleName\Observer\ChangeTheme" />

Hope it will help!!!

  • Thanks Which event i have to use or create plugin?
    – omelandr
    Oct 9, 2019 at 7:11
  • You can do it using an observer. layout_load_before this event means change layout before the pages load.
    – Sumit
    Oct 9, 2019 at 7:13

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