function SystemConfigSubscriber::onConfigSave
Rebuilds the router when the default or admin theme is changed.
Parameters
\Drupal\Core\Config\ConfigCrudEvent $event: The configuration event.
File
- 
              core/modules/ system/ src/ SystemConfigSubscriber.php, line 41 
Class
- SystemConfigSubscriber
- System Config subscriber.
Namespace
Drupal\systemCode
public function onConfigSave(ConfigCrudEvent $event) {
  $saved_config = $event->getConfig();
  if ($saved_config->getName() == 'system.theme' && ($event->isChanged('admin') || $event->isChanged('default'))) {
    $this->routerBuilder
      ->setRebuildNeeded();
  }
}Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.
