catalog/controller/event/theme.php

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<?php
class ControllerEventTheme extends Controller {
	public function index(&$route, &$args, &$template) {
		// If there is a template file we render
		if ($template) {
			// include and register Twig auto-loader
			include_once(DIR_SYSTEM . 'library/template/Twig/Autoloader.php');

			Twig_Autoloader::register();

			// specify where to look for templates
            $loader = new \Twig\Loader\FilesystemLoader(DIR_TEMPLATE);

			$config = array('autoescape' => false);

			if ($this->config->get('template_cache')) {
				$config['cache'] = DIR_CACHE;
			}

			// initialize Twig environment
            $twig = new \Twig\Environment($loader, $config);
            //自定义函数
            $function = new \Twig\TwigFunction('template',function($file,$data = []) use($loader,$twig){
                $content =  file_get_contents(DIR_TEMPLATE.$file.'.twig');
                if($content) {
                    $loader->setTemplate($file . '.twig', $content);
                    $twig->render($file. '.twig', $data);
                    return $file.'.twig';
                }
                return '';
            });
            $twig->addFunction($function);
			return $twig->createTemplate($template)->render($args);
		}
	}

	public function override(&$route, &$args, &$template) {
		if (!$this->config->get('theme_' . $this->config->get('config_theme') . '_status')) {
			exit('Error: A theme has not been assigned to this store!<br/>错误：没有启用主题模板！');
		}

		// If the default theme is selected we need to know which directory its pointing to
		if ($this->config->get('config_theme') == 'default') {
			$theme = $this->config->get('theme_default_directory');
		} else {
			$theme = $this->config->get('config_theme');
		}

		// If there is a theme override we should get it
		$this->load->model('design/theme');

		$theme_info = $this->model_design_theme->getTheme($route, $theme);

		if ($theme_info) {
			$template = html_entity_decode($theme_info['code'], ENT_QUOTES, 'UTF-8');
		} elseif (is_file(DIR_TEMPLATE . $theme . '/template/' . $route . '.twig')) {
			$this->config->set('template_directory', $theme . '/template/');
		} elseif (is_file(DIR_TEMPLATE . 'default/template/' . $route . '.twig')) {
			$this->config->set('template_directory', 'default/template/');
		}