class func animateToVC(sender: UIViewController, destination: UITabBarController, index: Int) {

    let fromView = sender.view
        destination.selectedIndex = index
    let toView = destination.view

    // Add the toView to fromView view
    fromView?.superview!.addSubview(toView!)

    // Position toView off screen (to the left/right of fromView)
    let screenHeight = UIScreen.main.bounds.size.height

    let offset = (screenHeight : -screenHeight)

    toView?.center = CGPoint(x: (fromView?.center.x)!, y: (toView?.center.y)! + offset)

    // Disable interaction during animation
    toView?.isUserInteractionEnabled = false

    UIView.animate(withDuration: 0.7, delay: 0, usingSpringWithDamping: 0.6, initialSpringVelocity: 0.7, options: UIViewAnimationOptions.curveEaseOut, animations: {

        // Slide the views by -offset
        fromView?.center = CGPoint(x: (fromView?.center.x)!, y: (fromView?.center.y)! - offset)
        toView?.center   = CGPoint(x: (toView?.center.x)!, y: (toView?.center.y)! - offset)

    }, completion: { finished in

        // Remove the old view.
        fromView?.removeFromSuperview()

        // Re-enable interaction after animation
        toView?.isUserInteractionEnabled = true
    })
}

let tbc = self.storyboard!.instantiateViewController(withIdentifier: "MyTabController") as! UITabBarController

ViewControllerTransition.animateToVC(sender: self, destination: tbc, index: 1)

let tbc = self.storyboard!.instantiateViewController(withIdentifier: "MyTabController") as! UITabBarController
tbc.modalTransitionStyle = .coverVertical
self.present(tbc, animated: true, completion: nil)