passing data from controller to my library [SOLVED]

how to passing data from controller to my library? 

or

how to get uri segment(3) in library? 

my controller

Code:

$data['page'] = $this->uri->segment(3);

my library

Code:

// How to passing data from controller or uri to $page?
public function popular($page = 2){

}

Thanks before.


SOLVED

in library :

Code:

public function namefunction(){
$this->controller = $this->_CI->uri->segment(3);
}

in controller :

Code:

$data = array (
'page' => $this->uri->segment(3)
)