如何以编程方式在ARSKView场景中设置SKNode的位置？

import ARKit
import SpriteKit

class ViewController: UIViewController, ARSKViewDelegate {
    @IBOutlet var sceneView: ARSKView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置ARSKView的代理
        sceneView.delegate = self
        
        // 创建一个SKNode对象
        let node = SKSpriteNode(color: .red, size: CGSize(width: 100, height: 100))
        
        // 设置SKNode的位置
        node.position = CGPoint(x: 0, y: 0)
        
        // 将SKNode添加到ARSKView的场景中
        sceneView.scene?.addChild(node)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // 创建一个AR会话配置
        let configuration = ARWorldTrackingConfiguration()
        
        // 运行AR会话
        sceneView.session.run(configuration)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // 暂停AR会话
        sceneView.session.pause()
    }
    
    func session(_ session: ARSession, didUpdate frame: ARFrame) {
        // 获取相机的位置和方向信息
        let cameraTransform = frame.camera.transform
        
        // 计算SKNode在AR场景中的位置
        let nodePosition = SCNVector3Make(cameraTransform.columns.3.x, cameraTransform.columns.3.y, cameraTransform.columns.3.z)
        
        // 设置SKNode的位置
        sceneView.scene?.childNode(withName: "node", recursively: true)?.position = CGPoint(x: CGFloat(nodePosition.x), y: CGFloat(nodePosition.y))
    }
}