     fileprivate func _handleKeyboardWillChangeFrameNotification(_ notification: NSNotification) {
         if let keyboardFrame = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue, let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? TimeInterval, let curve = notification.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as? UInt {
             // print("Keyboard height: \(keyboardFrame.height)")
-            self._keyboardAlignmentViewHeightConstraint.constant = keyboardFrame.height
+            // self._keyboardAlignmentViewHeightConstraint.constant = keyboardFrame.height
             UIView.animate(withDuration: duration, delay: 0.0, options: UIViewAnimationOptions(rawValue: curve), animations: { [unowned self] in
                 self.view.layoutIfNeeded()
             }, completion: nil)

        }
    }
    @discardableResult
    public func removeViewController<T>(_ viewController: T) -> (Bool, UIViewController?) where T: UIViewController, T:TabNavigationReadable {
        guard let index = _rootViewControllersContext.viewControllers.index(of: viewController) else {
            return (false, nil)
        }

        _panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(_handlePanGestureRecognizer(_:)))
        _panGestureRecognizer.isEnabled = false
        _panGestureRecognizer.maximumNumberOfTouches = 1
        // _keyboardAlignmentViewHeightConstraint = _keyboardAlignmentView.heightAnchor.constraint(equalToConstant: 0.0)
        // _keyboardAlignmentViewHeightConstraint.isActive = true
        // NotificationCenter.default.addObserver(self, selector: #selector(_handleKeyboardWillChangeFrameNotification(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(_handleKeyboardWillChangeFrameNotification(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
        // NotificationCenter.default.addObserver(self, selector: #selector(_handleKeyboardWillChangeFrameNotification(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
