ulthon_admin/app/index/controller/BaseController.php

<?php
namespace app\index\controller;

use app\BaseController as AppBaseController;
use think\facade\Config;
use think\facade\View;
use think\helper\Str;

class BaseController extends AppBaseController
{

    /**
     * 是否使用多模板
     * 仅当名称为空或者指定名称有效,
     * 使用跨应用,跨控制器,引用模板路径的写法时无效
     *
     * @var boolean
     */
    protected $isUseTpls = true;

    public function assign($template,$value)
    {
        return View::assign($template,$value);
    }

    public function fetch($template = '',$vars = [])
    {
        if($this->isUseTpls && strpos($template,'@') === false && stripos($template,'/') === false){

            if($template === ''){
                $config_auto_rule = Config::get('view.auto_rule');
                if (2 == $config_auto_rule) {
                    $template = $this->request->action(true);
                } elseif (3 == $config_auto_rule) {
                    $template = $this->request->action();
                } else {
                    $template = Str::snake($this->request->action());
                }
            }
            return View::fetch(get_system_config('index_tpl_name').$template,$vars);
        }else{
            return View::fetch($template,$vars);
        }

    }
}