if ( ! defined('BASEPATH')) exit('No direct script access allowed');
require(APPPATH.'libraries/smarty-3.1.27/libs/Smarty.class.php');
class Ci_smarty extends Smarty {
 protected $ci;
 public function __construct()
 {
 parent::__construct();
 $this->ci = & get_instance();
 $this->ci->load->config('smarty');//加载smarty的配置文件
 $this->cache_lifetime =$this->ci->config->item('cache_lifetime');
 $this->caching = $this->ci->config->item('caching');
 $this->config_dir = $this->ci->config->item('config_dir');
 $this->template_dir = $this->ci->config->item('template_dir');
 $this->compile_dir = $this->ci->config->item('compile_dir');
 $this->cache_dir = $this->ci->config->item('cache_dir');
 $this->use_sub_dirs = $this->ci->config->item('use_sub_dirs');
 $this->left_delimiter = $this->ci->config->item('left_delimiter');
 $this->right_delimiter = $this->ci->config->item('right_delimiter');
 }
}

if ( ! defined('BASEPATH')) exit('No direct script access allowed');
$config['cache_lifetime'] = 60;
$config['caching'] = false;
$config['template_dir'] = APPPATH .'views';
$config['compile_dir'] = APPPATH .'views/template_c';
$config['cache_dir'] = APPPATH . 'views/cache';
$config['config_dir'] = APPPATH . 'views/config';
$config['use_sub_dirs'] = false; //子目录变量(是否在缓存文件夹中生成子目录)
$config['left_delimiter'] = '{';
$config['right_delimiter'] = '}';

class MY_controller extends CI_Controller {
 public function __construct() {
 parent::__construct();
 }
 public function assign($key,$val)
 {
 $this->ci_smarty->assign($key,$val);
 }
 public function display($html)
 {
 $this->ci_smarty->display($html);
 }
}

defined('BASEPATH') OR exit('No direct script access allowed');
class Welcome extends MY_controller {
 public function index()
 {
 $test='ci 3.0.3 + smarty 3.1.27 配置成功';
 $this->assign('test',$test);
 $this->display('test.html');
 }
}

{$test}

ci 3.0.3 + smarty 3.1.27 配置成功