     }
     private func _initializer() {
         tabNavigationBar.delegate = self
-        _panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(_handePanGestureRecognizer(_:)))
+        _panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(_handlePanGestureRecognizer(_:)))
         _panGestureRecognizer.isEnabled = false
     }
     

                if finished {
                    formerViewController.view.transform = formerTransform
                    viewController.endAppearanceTransition()
                    viewController.view.clipsToBounds = clipsToBounds
                    for _viewController in self._rootViewControllersInfo.viewControllers {
                        _viewController.view.removeFromSuperview()
                        _viewController.endAppearanceTransition()

    // MARK: - Actions.
    
    @objc
    private func _handlePanGestureRecognizer(_ sender: UIPanGestureRecognizer) {
        switch sender.state {
        case .possible: fallthrough
        case .began:
