在Mac Catalyst应用程序中，如何设置可拖动区域以在屏幕上移动窗口？

import UIKit

class MainWindowController: UIViewController {
    // 在标题栏视图中添加拖动手势识别器
    func setupDraggableArea() {
        let draggableArea = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 40))
        view.addSubview(draggableArea)
        
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
        draggableArea.addGestureRecognizer(panGesture)
    }
    
    // 拖动手势的处理方法
    @objc func handlePanGesture(_ gesture: UIPanGestureRecognizer) {
        guard let window = view.window else { return }
        
        let translation = gesture.translation(in: window)
        var frame = window.frame
        frame.origin.x += translation.x
        frame.origin.y += translation.y
        window.frame = frame
        
        gesture.setTranslation(.zero, in: window)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupDraggableArea()
    }
}