ARViewContainer.swift

import SwiftUI
import RealityKit

struct ARViewContainer: UIViewRepresentable {
  
  func createPreview(boxAnchor: Experience.Box, arView: ARView) -> ARView {
    guard let steelBox = boxAnchor.steelBox else { return arView }
    let cameraAnchor = AnchorEntity(.camera)
    arView.scene.anchors.append(cameraAnchor)
    cameraAnchor.addChild(steelBox)
    var transform = steelBox.transform
    transform.translation = SIMD3<Float>(0,0,1.86)
    steelBox.move(to: transform, relativeTo: nil)
    return arView
  }
  
  func makeUIView(context: Context) -> ARView {
    let arView = ARView(frame: .zero)
    guard let boxAnchor = try? Experience.loadBox() else { return arView }
    #if targetEnvironment(simulator)
    return createPreview(boxAnchor: boxAnchor, arView: arView)
    #else
    arView.scene.anchors.append(boxAnchor)
    return arView
    #endif
    
  }
  
  func updateUIView(_ uiView: ARView, context: Context) {}
}