当场景视图中的新视图显示时,应用程序已冻结

Question

在我的一个iOS App开发项目中,每当我试图在ARSCNView上推送视图时.应用程序冻结在下面是我的代码.如果您了解相同的解决方案,请建议适当的解决方案.

- >在sceneView控制器上推送视图时让应用程序冻结

 let session = ARSession()
        var sessionConfig: ARSessionConfiguration = ARWorldTrackingSessionConfiguration()
        var use3DOFTracking = false {
            didSet {
                if use3DOFTracking {
                    sessionConfig = ARSessionConfiguration()
                }
                sessionConfig.isLightEstimationEnabled = true
                session.run(sessionConfig)
            }
        }    
    }

override func viewDidLoad() {
        super.viewDidLoad()
        self.setupScene()
        setupSession()
}

override func viewWillAppear(_ animated: Bool) {
        self.tabBarController?.tabBar.isHidden = false
        session.run(sessionConfig, options: [.resetTracking, .removeExistingAnchors])
    }

override func viewDidDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    session.pause()
}


 func setupScene() {
        sceneView.delegate = self
        sceneView.session = session
        sceneView.antialiasingMode = .multisampling4X
        sceneView.automaticallyUpdatesLighting = false

        sceneView.preferredFramesPerSecond = 60
        sceneView.contentScaleFactor = 1.3
        //sceneView.showsStatistics = true

        enableEnvironmentMapWithIntensity(25.0)

        if let camera = sceneView.pointOfView?.camera {
            camera.wantsHDR = true
            camera.wantsExposureAdaptation = true
            camera.exposureOffset = -1
            camera.minimumExposure = -1
        }
    }

    func setupSession() {
        if let worldSessionConfig = sessionConfig as? ARWorldTrackingSessionConfiguration {
            worldSessionConfig.planeDetection = .horizontal
            session.run(worldSessionConfig, options: [.resetTracking, .removeExistingAnchors])
        }
}

Answer 1

您不应以任何原因中断 AR 会话。尝试使用弹出屏幕重新构建您的设计。

iOS 11 Beta 存在一个错误，ARCamera当 ARSCNView 消失时，该错误会冻结，因此，如果您确实需要使用 AR 暂时隐藏屏幕：

1. 从故事板中删除并从视图控制器中ARSCNView删除；IBOutlet
2. ARSCNView当出现时以编程方式创建UIViewController；
3. 当 UIViewController 消失时移除ARSCNView。

有一个简短的例子：

class ViewController: UIViewController, ARSCNViewDelegate {

    // Weak reference for scene view.
    weak var sceneView: ARSCNView!

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Create a new AR Scene View.
        let sceneView = ARSCNView(frame: view.bounds)
        sceneView.delegate = self
        sceneView.showsStatistics = true
        view.addSubview(sceneView)
        // Create a new scene.
        sceneView.scene = SCNScene(named: "art.scnassets/ship.scn")!
        // Running session.
        sceneView.session.run(ARWorldTrackingSessionConfiguration())
        // Saving weak reference.
        self.sceneView = sceneView
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        // Removing current SceneView to avoid freezes.
        sceneView?.removeFromSuperview()
    }
}

当然，您应该根据需要检查框架的场景视图和设置ARSCNView。ARSessionSCNScene

Xcode 测试版 5

大多数冻结问题已在 Beta 5 中得到修复。但有时它仍然会冻结，例如当您使用本机共享视图控制器时。