Swift-SceneKit无法从art.scnassets加载.scn文件求助

问题概述 #

无法加载ARDicee/art.scnassets文件夹下的diceCollada.scn及默认ship.scn文件，尝试两种SCNScene创建方式均失败。使用环境：Xcode 14.1，macOS Ventura 13.0.1。

尝试的代码 #

方式1：通过资源名加载 #

import UIKit
import SceneKit
import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {
    
    @IBOutlet var sceneView: ARSCNView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        sceneView.delegate = self
        sceneView.showsStatistics = true
         
        // 加载场景时触发错误
        guard let diceScene = SCNScene(named: "art.scnassets/diceCollada.scn") else {
            fatalError()
        }
        
        if let diceNode = diceScene.rootNode.childNode(withName: "Dice", recursively: true) {
            diceNode.position = SCNVector3(x: 0, y: 0, z: -0.1)
            sceneView.scene.rootNode.addChildNode(diceNode)
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        if ARWorldTrackingConfiguration.isSupported {
            let configuration = ARWorldTrackingConfiguration()
            sceneView.session.run(configuration)
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        sceneView.session.pause()
    }
}

方式2：通过绝对路径加载 #

override func viewDidLoad() {
        super.viewDidLoad()
        
        sceneView.delegate = self
        sceneView.showsStatistics = true

        let filePath = URL(fileURLWithPath: "/Applications/xcode/Development/ARDicee/ARDicee/art.scnassets/diceCollada.scn")
        do {
            let diceScene = try SCNScene(url: filePath)
            if let diceNode = diceScene.rootNode.childNode(withName: "Dice", recursively: true) {
                diceNode.position = SCNVector3(x: 0, y: 0, z: -0.1)
                sceneView.scene.rootNode.addChildNode(diceNode)
            }
        } catch {
            print(error)
        }
    }

触发的错误信息 #

Error Domain=NSCocoaErrorDomain Code=260 "The file “diceCollada.scn” couldn’t be opened because there is no such file." UserInfo={NSFilePath=/Applications/xcode/Development/ARDicee/ARDicee/art.scnassets/diceCollada.scn, NSUnderlyingError=0x282924570 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

解决方案 #

1. 确认资源已加入编译Target #

• 选中项目导航栏中的art.scnassets文件夹，打开右侧File Inspector，检查Target Membership是否勾选当前项目的target。未勾选的文件不会被打包进App Bundle，导致加载失败。

2. 修正资源路径写法 #

• 绝对路径方式不可靠：App运行时无法直接访问本地磁盘的绝对路径，必须通过Bundle获取资源路径：

  if let filePath = Bundle.main.path(forResource: "diceCollada", ofType: "scn", inDirectory: "art.scnassets") {
      let url = URL(fileURLWithPath: filePath)
      do {
          let diceScene = try SCNScene(url: url)
          // 节点操作逻辑
      } catch {
          print(error)
      }
  }
  

• 检查文件夹名称：确保项目内的文件夹是art.scnassets（后缀为.scnassets，而非你提到的art.assets）。

3. 验证资源文件完整性 #

• 右键art.scnassets选择Show in Finder，确认diceCollada.scn存在且未损坏；若文件缺失，重新导入并勾选Copy items if needed。

4. 清理缓存重新编译 #

• 按下Command+Shift+K清理项目缓存，再按Command+B重新编译，避免缓存导致的路径匹配问题。

内容的提问来源于stack exchange，提问作者ADAM _YONEDA