YBSwipeViewController *swipeRootViewCntrlr = [[YBSwipeViewController alloc] initWithMainViewController:mainNavigationCntrlr menuViewController:menuNavigationCntrlr];
    self.window.rootViewController = swipeRootViewCntrlr;

 [Webview loadRequest:Request];

         dispatch_async(dispatch_get_main_queue(), ^(void){     [WebView loadRequest:Request];   });

public function registration(){
			$this->load->library('form_validation');
		// field name, error message, validation rules ('user_name', 'User Name', 'trim|required|min_length[4]|xss_clean');
			$this->form_validation->set_rules('user_name', 'User Name', 'trim|required|min_length[6]|xss_clean');
			$this->form_validation->set_rules('email_address', 'Your Email', 'trim|required|valid_email');
		
			$this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[6]|max_length[32]');
			$this->form_validation->set_rules('con_password', 'Password Confirmation', 'trim|required|matches[password]');

			if($this->form_validation->run() == FALSE){
				$this->index();
			}else{
				$this->user_model->add_user();
				$this->thank();
			}
		}

ဒါကတော့ Model ထဲက Add User Function ပါ။

public function add_user(){
	# Check if mail exists (I pressume e-mail is unique value in the DB)
	$query = $this->db->get_where('user',array('email'=>$this->input->post('email_address')));
	if($query->num_rows() == 1){
        # E-mail is found in the database
        return false;
	}else{
       #E-mail not found, write record
        $data=array(
			'username'=>$this->input->post('user_name'),
			'email'=>$this->input->post('email_address'),
			'password'=>md5($this->input->post('password'))
			);
		$this->db->insert('user',$data);
        }
		
}

 
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
      //other code
 if([fileType isEqualToString:@"pdf"])
     {
         NSLog(@"It is pdf file.");
         //other code to save to nsdocumentdirectory and then get this path
         // file://localhost/var/mobile/Applications/024D40FF-4518-4526-BEAB-   2A0679FD6308/Documents/iphone_user_guide.pdf
      
              NSURL *pdfURL = [NSURL fileURLWithPath:pathToDownloadTo];
             UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:pdfURL];
             
             [docController setDelegate:self];
             
             [docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];

     }
}

- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
    return self;
}