Method getController

/**
 * Get a controller from the component
 *
 * @param   string  $name    Controller name
 * @param   string  $client  Optional client (like Administrator, Site etc.)
 * @param   array   $config  Optional controller config
 *
 * @return  BaseController
 *
 * @since   4.0.0
 */
public function getController(string $name, string $client = '', array $config = array()) : BaseController
{
    // Set up the client
    $client = $client ?: ucfirst($this->app->getName());
    // Get the controller instance
    $controller = $this->mvcFactory->createController($name, $client, $config, $this->app, $this->input);
    // Check if the controller could be created
    if (!$controller) {
        throw new \InvalidArgumentException(Text::sprintf('JLIB_APPLICATION_ERROR_INVALID_CONTROLLER_CLASS', $name));
    }
    return $controller;
}