Adding a view controller as a subview in another v

Question

I have found few posts for this problem but none of them solved my issue.

Say like I've..

1. ViewControllerA
2. ViewControllerB

I tried to add ViewControllerB as a subview in ViewControllerA but, it's throwing an error like "fatal error: unexpectedly found nil while unwrapping an Optional value".

Below is the code...

ViewControllerA

var testVC: ViewControllerB = ViewControllerB();

override func viewDidLoad()
{
    super.viewDidLoad()
    self.testVC.view.frame = CGRectMake(0, 0, 350, 450);
    self.view.addSubview(testVC.view);
    // Do any additional setup after loading the view.
}

ViewControllerB is just a simple screen with a label in it.

ViewControllerB

 @IBOutlet weak var test: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    test.text = "Success" // Throws ERROR here "fatal error: unexpectedly found nil while unwrapping an Optional value"
}

EDIT

With the suggested solution from the user answers, ViewControllerB in ViewControllerA is going off the screen. Grey border is the frame I have created for the subview.

Answer 1

func callForMenuView() {

    if(!isOpen)

    {
        isOpen = true

        let menuVC : MenuViewController = self.storyboard!.instantiateViewController(withIdentifier: "menu") as! MenuViewController
        self.view.addSubview(menuVC.view)
        self.addChildViewController(menuVC)
        menuVC.view.layoutIfNeeded()

        menuVC.view.frame=CGRect(x: 0 - UIScreen.main.bounds.size.width, y: 0, width: UIScreen.main.bounds.size.width-90, height: UIScreen.main.bounds.size.height);

        UIView.animate(withDuration: 0.3, animations: { () -> Void in
            menuVC.view.frame=CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width-90, height: UIScreen.main.bounds.size.height);
    }, completion:nil)

    }else if(isOpen)
    {
        isOpen = false
      let viewMenuBack : UIView = view.subviews.last!

        UIView.animate(withDuration: 0.3, animations: { () -> Void in
            var frameMenu : CGRect = viewMenuBack.frame
            frameMenu.origin.x = -1 * UIScreen.main.bounds.size.width
            viewMenuBack.frame = frameMenu
            viewMenuBack.layoutIfNeeded()
            viewMenuBack.backgroundColor = UIColor.clear
        }, completion: { (finished) -> Void in
            viewMenuBack.removeFromSuperview()

        })
    }