无法使用 RealityKit 场景预览 SwiftUI Canvas

Question

我只创建了一个新的属性 RealityKit。 Xcode 将无法预览 SwiftUI canvas。但是可以构建成功。

我通过 Xcode 创建应用程序。
选择增强现实应用程序并将用户界面设置为SwiftUI。
项目可以正常运行。

import SwiftUI
import RealityKit

struct ContentView : View {
    var body: some View {
        return VStack {
            Text("123")
            ARViewContainer().edgesIgnoringSafeArea(.all)
        }
    }
}

struct ARViewContainer: UIViewRepresentable {

    func makeUIView(context: Context) -> ARView {

        let arView = ARView(frame: .zero)

        // Load the "Box" scene from the "Experience" Reality File
        let boxAnchor = try! Experience.loadBox()

        // Add the box anchor to the scene
        arView.scene.anchors.append(boxAnchor)

        return arView

    }

    func updateUIView(_ uiView: ARView, context: Context) {}

}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif

我只在 makeUIView 函数中新建属性个 RealityKit。

let test: AnchoringComponent.Target.Alignment = .horizontal

项目无法预览canvas出现错误

'Alignment' is not a member type of 'AnchoringComponent.Target'

项目仍然可以编译成功。

我很困惑我遇到了什么。有人遇到同样的问题吗？

Answer 1

您必须解决几个问题:

You can't use anchoring component in iOS Simulator or in SwiftUI Canvas Preview, because it can only be used for pinning a virtual content to the real world surfaces. So no simulator for AR apps.

RealityKit 锚点在 iOS 模拟器模式和 SwiftUI Canvas 预览模式下无用。

// Use it only for compiled AR app, not simulated...

let _: AnchoringComponent.Target.Alignment = .horizontal

不仅锚点在 iOS Simulator Mode 和 SwiftUI Preview Mode 中没有用，而且其他 session-oriented 属性（包括 ARView.session）也像你一样可以在图片上看到：

Change .backgroundColor in ARView to any other desirable one. Default color sometimes doesn't allow you to see a RealityKit scene. Looks like a bug.

func makeUIView(context: Context) -> ARView {

    let arView = ARView(frame: .zero)
    let boxAnchor = try! Experience.loadBox()
    boxAnchor.steelBox?.scale = SIMD3(5, 5, 5)
    boxAnchor.steelBox?.orientation = simd_quatf(angle: Float.pi/4, axis: SIMD3(1,1,0))

    arView.backgroundColor = .orange

    arView.scene.anchors.append(boxAnchor)
    return arView
}

下面是您现在可以在 SwiftUI 预览区看到的内容：

And, of course, you have to give a Camera Permission before using AR app. And it doesn't matter what you're using: Storyboard or SwiftUI.

您需要在[=20中添加Camera Usage Description属性和arkit字符串=] 文件:

XML 版本如下所示：

/*  info.plist


<key>NSCameraUsageDescription</key>
    <string>Camera access for AR experience</string>

<key>UIRequiredDeviceCapabilities</key>
<array>
    <string>armv7</string>
    <string>arkit</string>
</array>

*/

解决这些问题后，应用程序按预期编译和工作（没有任何错误）：

无法使用 RealityKit 场景预览 SwiftUI Canvas

Can't preview SwiftUI Canvas with RealityKit scene

augmented-reality

swift

arkit

swiftui

realitykit