ios - 如何在我的 swiftui 应用程序中嵌入苹果的演示：Capturing Body Motion in 3D？

Question

这是我第一次使用swiftui，所以我不太清楚如何在我的swiftui App中使用演示。我发现demo是基于UIKIT的，但是我的App是基于swiftui的，所以不知道demo如何适配App。我试图将 HumanViewController 包装如下：

struct HumanViewControllerControllerWrapper: UIViewControllerRepresentable {

    typealias UIViewControllerType = HumanViewController

    func makeUIViewController(context: UIViewControllerRepresentableContext<HumanViewControllerControllerWrapper>) -> HumanViewControllerControllerWrapper.UIViewControllerType {

    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let mainViewController: HumanViewController = mainStoryboard.instantiateViewController(withIdentifier: "Main1") as! HumanViewController
      return mainViewController

    }

    func updateUIViewController(_ uiViewController: HumanViewControllerControllerWrapper.UIViewControllerType, context: UIViewControllerRepresentableContext<HumanViewControllerControllerWrapper>) {
        //
    }
}

我所有的代码：

//
//  ContentView.swift
//  random name
//
//  
import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
           NavigationLink("click here", destination: HumanViewControllerControllerWrapper())
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

struct HumanViewControllerControllerWrapper: UIViewControllerRepresentable {

    typealias UIViewControllerType = HumanViewController

    func makeUIViewController(context: UIViewControllerRepresentableContext<HumanViewControllerControllerWrapper>) -> HumanViewControllerControllerWrapper.UIViewControllerType {

    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let mainViewController: HumanViewController = mainStoryboard.instantiateViewController(withIdentifier: "Main1") as! HumanViewController
      return mainViewController

    }

    func updateUIViewController(_ uiViewController: HumanViewControllerControllerWrapper.UIViewControllerType, context: UIViewControllerRepresentableContext<HumanViewControllerControllerWrapper>) {
        //
    }
}

//
//  HumanViewController.swift
//  random name
//
//

import Foundation
/*
See LICENSE folder for this sample’s licensing information.

Abstract:
The sample app's main view controller.
*/

import UIKit
import RealityKit
import ARKit
import Combine

public class HumanViewController: UIViewController, ARSessionDelegate {

    @IBOutlet var arView: ARView!
    
    // The 3D character to display.
    var character: BodyTrackedEntity?
    let characterOffset: SIMD3<Float> = [-1.0, 0, 0] // Offset the character by one meter to the left
    let characterAnchor = AnchorEntity()
    
    public override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        
        // If the iOS device doesn't support body tracking, raise a developer error for
        // this unhandled case.
        guard ARBodyTrackingConfiguration.isSupported else {
            fatalError("This feature is only supported on devices with an A12 chip")
        }

        // Run a body tracking configration.
        let configuration = ARBodyTrackingConfiguration()
        arView.session.delegate = self
        arView.session.run(configuration)
        
        arView.scene.addAnchor(characterAnchor)
        
        // Asynchronously load the 3D character.
        var cancellable: AnyCancellable? = nil
        cancellable = Entity.loadBodyTrackedAsync(named: "character/robot").sink(
            receiveCompletion: { completion in
                if case let .failure(error) = completion {
                    print("Error: Unable to load model: \(error.localizedDescription)")
                }
                cancellable?.cancel()
        }, receiveValue: { (character: Entity) in
            if let character = character as? BodyTrackedEntity {
                // Scale the character to human size
                character.scale = [1.0, 1.0, 1.0]
                self.character = character
                cancellable?.cancel()
            } else {
                print("Error: Unable to load model as BodyTrackedEntity")
            }
        })
    }
    
    public func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        for anchor in anchors {
            guard let bodyAnchor = anchor as? ARBodyAnchor else { continue }
            
            // Update the position of the character anchor's position.
            let bodyPosition = simd_make_float3(bodyAnchor.transform.columns.3)
            characterAnchor.position = bodyPosition + characterOffset
            // Also copy over the rotation of the body anchor, because the skeleton's pose
            // in the world is relative to the body anchor's rotation.
            characterAnchor.orientation = Transform(matrix: bodyAnchor.transform).rotation
   
            if let character = character, character.parent == nil {
                // Attach the character to its anchor as soon as
                // 1. the body anchor was detected and
                // 2. the character was loaded.
                characterAnchor.addChild(character)
            }
        }
    }
}

//
//  random_nameApp.swift
//  random name
//
//

import SwiftUI

@main
struct random_nameApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        //add code when didFinishLaunchingWithOptions
        return true
    }
}

当我单击设备上的链接时它失败了。日志是：

Unexpectedly found nil while implicitly unwrapping an Optional value: file random_name/HumanViewController.swift, line 42

那么我该如何处理这个错误或者任何人都可以告诉我如何在我的应用程序中嵌入演示？先感谢您。

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