MVC模式:使用视图中模型的函数

我一直在使用CodeIgniter开发一个web应用程序。

我也实现了以下MVC结构的所有功能，但我不确定我是否已经混淆了自己到目前为止…

如果我在视图中使用模型中的函数，是否违反了MVC模式?这被认为是视图在与模型对话吗?

让我展示一些代码:

一个来自我的控制器:

public function loader($page){
    #load pages if these settings will be loaded for sure
        if ( ! defined('BASEPATH')) exit('No direct script access allowed');
        $this->load->helper('url');
        $this->load->library('session');
        $this->load->model('app_model');
        $this->load->model('app_user_model');
        $this->load->view('app/header');
        $this->load->view($page);
        $this->load->view('app/footer');
    }

一个来自我的模型:

public function submit_login($username, $pass){
    //try to login, if the login credentials are correct, set the user session to username.
        $this->db->select("name, PersonName");
        $this->db->where("name", $username);
        $this->db->where("pass", $pass);
        $result = $this->db->get("members");

        if ($result->num_rows() > 0){
            foreach($result->result() as $user){
                $this->session->set_userdata('user_name', $user->PersonName);
                $this->session->set_userdata('user', $user->name);
            }
            return 1;
        }return 0;
    }

$is_login = $this->app_user_model->is_loggedin();
if($is_login){
    //if user is logged in, prompt to log out
    echo "Welcome back ".$this->session->userdata['user_name'].".";
    echo anchor(base_url('profile/logout'), "logout" );
    echo "<br/>";
}else{
    echo validation_errors();
    //if user is not logged in, ask to log in first
    echo form_open('profile/login');
    $user_name = array(
                'maxlength'   => '25',
                'size'        => '55',
                'style'       => 'width:30%; margin-left:5%',
                'name'        => 'username',
                );
    //get the date 
    echo "<div class='user_name_input'>";
    echo "Username(email)";
    echo form_input($user_name, '', 'class="user_name"');
    echo "</div>";

在本例中，我从user_model调用is_loggedin() .

我遵循MVC模式正确吗?