在beforeAction中判断用户是否登录,如果未登录则执行redirect方法跳转,但实际上并没有!

        //初始化
        public function beforeAction($action)
        {
                $this->USER_INFO = Users::isLogin();
                if(Yii::$app->controller->id != 'login' &&  empty($this->USER_INFO))  
                {
                        return  $this->redirect(['login/index','referrer'=>Yii::$app->request->getHostInfo().Yii::$app->request->url]);
                }
                return parent::beforeAction($action);
        }
        
        //跳转
        public function redirect($url = '',$statusCode = 302)
        {
                if(empty(Yii::$app->request->get('referrer',null))  && empty($url))
                {
                        $url = Yii::$app->request->getReferrer();
                } else  if(!empty(Yii::$app->request->get('referrer',null)) &&  empty($url)){
                        $url =  Yii::$app->request->get('referrer',null);
                }
                return parent::redirect($url,$statusCode);
        }

解决方法是添加send()方法:

$this->redirect(['login/index','referrer'=>Yii::$app->request->getHostInfo().Yii::$app->request->url])->send();

手动向客户端发送请求:

    /**
     * Sends the response to the client.
     */
    public function send()
    {
        if ($this->isSent) {
            return;
        }
        $this->trigger(self::EVENT_BEFORE_SEND);
        $this->prepare();
        $this->trigger(self::EVENT_AFTER_PREPARE);
        $this->sendHeaders();
        $this->sendContent();
        $this->trigger(self::EVENT_AFTER_SEND);
        $this->isSent = true;
    }