如何在ARKit中放置自定义对象(.scn)？

import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {
    @IBOutlet var sceneView: ARSCNView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置AR场景
        sceneView.delegate = self
        let scene = SCNScene()
        sceneView.scene = scene
        
        // 导入自定义对象
        guard let objectScene = SCNScene(named: "customObject.scn") else {
            fatalError("Failed to load custom object")
        }
        
        // 创建一个节点并加载自定义对象
        let objectNode = SCNNode()
        for childNode in objectScene.rootNode.childNodes {
            objectNode.addChildNode(childNode)
        }
        
        // 设置节点的位置和缩放
        objectNode.position = SCNVector3(0, 0, -1) // 设置在相机前方1米的位置
        objectNode.scale = SCNVector3(0.1, 0.1, 0.1) // 缩小为原来的10倍
        
        // 将节点添加到AR场景中
        sceneView.scene.rootNode.addChildNode(objectNode)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // 配置AR会话
        let configuration = ARWorldTrackingConfiguration()
        sceneView.session.run(configuration)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // 暂停AR会话
        sceneView.session.pause()
    }
}