[ios] Adding a view controller as a subview in another view controller

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()

        })
    }

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