当我回到包含ARSCNView的视图控制器时，相机冻结.如何在没有ARSCNView停止工作的情况下进入此视图控制器

Question

我如何初始化ARSCNView

var sceneView: ARSCNView?
override func viewDidLoad() {
    super.viewDidLoad()
    if ARConfiguration.isSupported{
        sceneView = ARSCNView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
        view.addSubview(sceneView!)
        sceneView!.delegate = self
        // Show statistics such as fps and timing information
        sceneView!.showsStatistics = false
        // Create a new scene
        let scene = SCNScene(named: "totens.scnassets/Main.scn")!
        // Set the scene to the view
        sceneView!.scene = scene
     }
  }
override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
        guard let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "TotensImages", bundle: nil) else { return }
        let configuration = ARImageTrackingConfiguration()
        configuration.trackingImages = referenceImages
        let options: ARSession.RunOptions = [.removeExistingAnchors]
        sceneView!.session.run(configuration, options: options)
 }

当关闭此视图控制器并尝试重新启动会话时，相机将停止显示。有人知道如何帮助我吗？谢谢

Answer 1

好的，

这不是修复它的最佳方法，但它可能会起作用。

在拥有ARScene视图的ViewController上，您必须初始化一个布尔标志，该标志将检查您是否必须运行配置。

var shouldDoThingsInViewWillAppear: Bool = true
    override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
if shouldDoThingsInViewWillAppear {
shouldDoThingsInViewWillAppear = false
        guard let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "TotensImages", bundle: nil) else { return }
        let configuration = ARImageTrackingConfiguration()
        configuration.trackingImages = referenceImages
        let options: ARSession.RunOptions = [.removeExistingAnchors]
        sceneView!.session.run(configuration, options: options)
    }
 }

如果这有效，则意味着您不应该运行两次会话或不应该添加两次跟踪图像。

如果没有，请尝试对 viewDidAppear 而不是 ViewWillShow 执行相同的操作。

如果下界尝试将运行方法更改为

sceneView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])