Codeigniter&；HMVC回调首先显示

在我的codeigniter版本3.1.4/hmvc登录时，如果表单验证密码输入出于某种原因为空，回调函数将首先显示，而不是显示所需的消息

如消息所示，它应该首先显示所需密码的消息，而不是回调消息

问题如何确保它显示正确的验证消息 首先

自动加载表单验证

$autoload['libraries'] = array('database', 'form_validation');

控制器

<?php

class Login extends MX_Controller {

    public $CI;

    public function __construct() {
        parent::__construct();
        $this->load->model('catalog/user/user_model');

        $this->form_validation->CI =& $this;
    }

    public function index() {
        $data['type'] = $this->input->post('type');
        $data['password'] = $this->input->post('password');

        $this->form_validation->set_rules('type', 'Username Or Email', 'trim|required');
        $this->form_validation->set_rules('password', 'password', 'required|callback_validatePassword[password]');

        if ($this->form_validation->run() == false) {

            $data['header'] = Modules::run('catalog/common/header/index');
            $data['footer'] = Modules::run('catalog/common/footer/index');

            $this->load->view('template/account/login', $data);

        } else {

            $user_info = $this->user_model->get_user($user_id = '', $this->input->post('type', true));

            if ($user_info) {

                $remember = $this->input->post('remember') ? TRUE : FALSE;

                $this->user->login($user_info['user_id'], $remember);

                redirect(base_url("users") .'/'. $user_info['user_id'] .'/'. $user_info['username']);
            }
        }
    }

    public function validatePassword($str) {
        if ($this->user_model->validate_password($str, $this->input->post('type',  true))) {
            return TRUE;
        } else {
            $this->form_validation->set_message('validatePassword', 'Opp\'s somthing wrong with login!');
            return FALSE;
        }
    }
}

而不是这个-

$this->form_validation->set_rules('password', 'password', 'required|callback_validatePassword[password]');

请像这样使用回调函数-

$this->form_validation->set_rules('password', 'password', 'required', 'callback_validatePassword');

为什么我仍然有同样的问题？你可以做一件事，首先检查post值是否为空？如果（！empty（$data['password']）{$this->form_validation->set_rules（'password'，'password'，'callback_validatePassword[password]'）；}
$this->form_validation->set_rules('password', 'password', 'required|callback_validatePassword[password]');

$this->form_validation->set_rules('password', 'password', 'required', 'callback_validatePassword');