如何在情节提要中平移视图控制器

let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
view.addGestureRecognizer(panGesture)

@objc func handlePanGesture(_ gesture: UIPanGestureRecognizer) {
    guard let viewToMove = gesture.view else { return }
    
    let translation = gesture.translation(in: viewToMove.superview)
    viewToMove.center = CGPoint(x: viewToMove.center.x + translation.x, y: viewToMove.center.y + translation.y)
    gesture.setTranslation(.zero, in: viewToMove.superview)
}

@objc func handlePanGesture(_ gesture: UIPanGestureRecognizer) {
    // ...
    
    if gesture.state == .ended {
        let screenWidth = UIScreen.main.bounds.width
        let threshold: CGFloat = 0.5 // 平移超过屏幕宽度一半的阈值
        
        if viewToMove.center.x < -screenWidth * threshold {
            // 将视图控制器平移出屏幕
            navigationController?.popViewController(animated: true)
        } else if viewToMove.center.x > screenWidth * threshold {
            // 将视图控制器平移出屏幕
            navigationController?.pushViewController(nextViewController, animated: true)
        } else {
            // 将视图控制器恢复到原始位置
            UIView.animate(withDuration: 0.3) {
                viewToMove.center = self.view.center
            }
        }
    }
}