Question

在我的一个iOS App开发项目中，每当我尝试在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。

- ＆GT;在sceneView控制器上的推送视图

时冻结应用程序

 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

您不应因任何原因中断AR会话。尝试使用弹出窗口重构您的设计。

有一个iOS 11 Beta错误，当ARSCNView消失时会冻结ARCamera，所以，如果你真的需要暂时隐藏AR屏幕：

从情节提要中删除ARSCNView，然后从视图控制器中删除IBOutlet;
在出现ARSCNView时以编程方式创建UIViewController;
当UIViewController消失时删除ARSCNView。

这是一个简短的例子：

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，您应该检查框架是否有场景视图，并根据需要设置ARSCNView，ARSession和SCNScene。

Xcode Beta 5

大多数冻结在Beta 5中得到修复。但有时它仍会冻结，就像您使用本机共享视图控制器一样。

Answer 2

在我看来，你应该有一个viewDidAppear的覆盖功能，并在那里启动你的setupSession（）。

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    // Prevent the screen from being dimmed after a while.
    UIApplication.shared.isIdleTimerDisabled = true

    // Start the ARSession.
    setupSession()
}

当场景视图中的新视图显示时，应用程序已冻结

2 个答案: