Mage2\System\Module::registerViewComposer PHP Method

    protected function registerViewComposer()
    {
        View::composer(['layouts.admin-nav', 'layouts.admin-nav'], 'Mage2\\System\\ViewComposers\\AdminNavComposer');
        View::composer(['layouts.app'], 'Mage2\\System\\ViewComposers\\LayoutAppComposer');
    }