视图未读取会话或flash数据

尝试使用twitter登录。获取screen_name并设置为会话和flash数据。当我再次尝试访问视图中的会话数据时，我一无所获
查看

<div class="logged-in-user offset9" id="user-navbar" >
            <img class="img-circle" style="height:46px; width:46px;" src=""/>
            <a href="./getting-started.html"><?php $this->session->flashdata('twitter_screen_name');?></a>
          </div>
  </div>

控制器
我确实在日志消息中获得了屏幕名称。

$access_token = $this->connection->getAccessToken($this->input->get('oauth_verifier'));
            if ($this->connection->http_code == 200)
            {
                $this->session->set_userdata('access_token', $access_token['oauth_token']);
                $this->session->set_userdata('access_token_secret', $access_token['oauth_token_secret']);
                $this->session->set_userdata('twitter_user_id', $access_token['user_id']);
                $this->session->set_userdata('twitter_screen_name', $access_token['screen_name']);
                $this->session->set_flashdata('twitter_screen_name', $access_token['screen_name']);
                $this->session->unset_userdata('request_token');
                $this->session->unset_userdata('request_token_secret');
                log_message('info','>>>>>>>>>>>Enter Twitter Login'.$this->session->userdata('twitter_screen_name'));
                redirect(base_url('/'));

        }