gistfile1.txt

class TestVC: UIViewController {

    @IBOutlet weak var container: UIView!   // Outlet to container on IB
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let vcToAdd = storyboard?.instantiateViewControllerWithIdentifier("vcToAdd") as UIViewController
        self.container = vcToAdd.view
    }

}