codeigniter: modify value in view from controller

codeigniter: modify value in view from controller

I am trying to modified value from controller to view. I would like to
achieve that when a user is signing up, and submited, I can return
feedback from model to controller to view.
my view: main_view
<?php include('header.php'); ?>
<?php echo $sign_up_results ?>
<?php include('forms/forms.php'); ?>
<?php include('footer.php'); ?>
my controller
function __construct(){
parent::__construct();
$this->load->helper('url');
$template = $this->load->View('main_view');
}
function form_sign_up_controller(){
$this->load->model("form_sign_up");
$database_insert_results =
$this->form_sign_up->insert_user_detail_into_db();
$data['sign_up_results']=$database_insert_results;
$template = $this->load->View('main', $data);
}
The problem is when the view is loaded, the value "$sign_up_results" is
not yet defined. Is there anyway that I can define the value and then
change the value according to the results return from model to controller.