ARKit会话已暂停且未恢复 [英] ARKit Session Paused and Not Resuming

问题描述

在我的ARKit应用程序中，我提出了一个模态窗口。当我关闭模态并返回到ARSCNView时，我发现由于此代码会话暂停：

In my ARKit app I am presenting a modal window. When I close the modal and go back to the ARSCNView then I find out that the session is paused due to this code:

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

        // Pause the view's session
        sceneView.session.pause()
    } 

当我关闭模态并返回到ARKit相机视图屏幕时，此代码被触发：

When I close the modal and go back to the ARKit camera view screen this code gets fired:

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

        // Create a session configuration
        let configuration = ARWorldTrackingSessionConfiguration()

        // Run the view's session
        sceneView.session.run(configuration)
    }

但此代码永远不会恢复会话。屏幕在其读取的最后一张图像上完全冻结。有什么想法吗？

But this code never resumes the session. The screen is completely frozen on the last image it read. Any ideas?

我将viewDidAppear代码更新为以下代码。它仍然卡在相机屏幕上，图像被冻结。

I update the viewDidAppear code to be the following. It is still stuck on the camera screen with image frozen.

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

        // Create a session configuration
        let configuration = ARWorldTrackingSessionConfiguration()

        sceneView.session.delegate = self

        if self.isPaused {
            sceneView.session.run(sceneView.session.configuration!)
        } else {
            // Run the view's session
            sceneView.session.run(configuration)
        }


    }

推荐答案

不确定为什么你的会话没有恢复，但是...这通常不是你想要的情况。

Not sure why your session isn't resuming, but... this generally isn't a situation you want to be in anyway.

请注意Apple的附带自述文件ARKit示例代码（附于 ARKit上的WWDC17会话）：

Notice in the readme that ships with Apple's ARKit sample code (attached to the WWDC17 session on ARKit):

避免中断AR体验。如果用户转换到应用中的另一个全屏UI，则AR视图在返回时可能不是预期的状态。

Avoid interrupting the AR experience. If the user transitions to another fullscreen UI in your app, the AR view might not be an expected state when coming back.

使用弹出式演示文稿（甚至在iPhone上）用于辅助视图控制器，以在调整设置或进行模态选择时使用户保持AR体验。在此示例中， SettingsViewController 和 VirtualObjectSelectionViewController 类使用popover演示文稿。

Use the popover presentation (even on iPhone) for auxiliary view controllers to keep the user in the AR experience while adjusting settings or making a modal selection. In this example, the SettingsViewController and VirtualObjectSelectionViewController classes use popover presentation.

进一步详细说明：如果您暂停会话，当您的用户离开不同的全屏视图控制器时，它将无法跟踪世界。这意味着当您恢复时，场景中放置的任何虚拟内容都不会位于您离开的位置（相对于相机）。

To go into a bit more detail: if you pause the session, it won't be tracking the world while your user is away in a different fullscreen view controller. That means that when you resume, any virtual content placed in the scene won't be in the positions (relative to the camera) where you left it.

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