在AR的overlaySKScene中看不到UIkit元素

import UIKit
import SpriteKit
import ARKit

class OverlayScene: SKScene {
    var uiKitNode: UIKitNode!
    
    override func didMove(to view: SKView) {
        uiKitNode = UIKitNode()
        addChild(uiKitNode)
    }
}

class UIKitNode: SKNode {
    override init() {
        super.init()
        
        // 将UIKit元素转换为SKTexture
        let uiImage = UIImage(named: "example.png")
        let texture = SKTexture(image: uiImage!)
        
        // 创建SKSpriteNode来显示纹理
        let spriteNode = SKSpriteNode(texture: texture)
        addChild(spriteNode)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class ARViewController: UIViewController, ARSKViewDelegate {
    @IBOutlet var arView: ARSKView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置AR视图的delegate和overlaySKScene
        arView.delegate = self
        arView.showsFPS = true
        arView.showsNodeCount = true
        
        if let scene = SKScene(fileNamed: "OverlayScene") {
            arView.presentScene(scene)
        }
    }
    
    // ...
}