PanGesture问题

Question

我在这里使用此代码块从右侧显示我的侧菜单，而不是从左侧显示

 @objc func setupBarButtonItems(){
        let mainWindow  = UIApplication.shared.keyWindow
        //initial position of side menu
        menuController.view.frame = CGRect(x: maxX, y: 0, width: menuWidth, height: self.view.frame.height)
        mainWindow?.addSubview(menuController.view)
        addChildViewController(menuController)
        //add side menu button to nav bar
        let sideMenuButton = UIBarButtonItem(image: UIImage(named: "icons8-Menu-48")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(self.rightBarPressed))
        let calendarButton = UIBarButtonItem(image: UIImage(named: "icons8-calendar-50")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(self.presentCalendar))
        navigationItem.rightBarButtonItems = [sideMenuButton,calendarButton]
    }

    @objc func addPanGesture(){
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
        self.view.addGestureRecognizer(panGesture)
    }

    @objc func handlePan(gesture: UIPanGestureRecognizer){
        //will give you position of finger in swipe gesture
        let translation = gesture.translation(in: view)
        if gesture.state == .changed {
            var x = translation.x
            print(x)
            x = min(-menuWidth,x)
            x = max(0,-returnX)
            let transform = CGAffineTransform(translationX: x , y: 0)
            menuController.view.transform = transform
            navigationController?.view.transform = transform
        }else if gesture.state == .ended {
            rightBarPressed()
        }
        //drag out the menu controller

    }

但是，我的拖动有点缺陷。它可以准确地显示出来，但是当我尝试将其移回时，它会恢复到拉出状态。我知道向左滑动是向负方向滑动，向右滑动则相反。任何想法，我将如何更改最小和最大函数以使其正常工作

我添加了lil gif以显示当前性质