I want to convert this uikit code to swiftui

I want to convert this uikit code to swiftui but i have some problems and it doesn't work, please help me

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

class ViewController: UIViewController, ARSessionDelegate {

    @IBOutlet var arView: ARView!
    
    var character: BodyTrackedEntity?
    let characterOffset: SIMD3<Float> = [-1.0, 0, 0] 
    let characterAnchor = AnchorEntity()
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        arView.session.delegate = self
        
        guard ARBodyTrackingConfiguration.isSupported else {
            fatalError("This feature is only supported on devices with an A12 chip")
        }

        // 运行人体跟踪配置。
        let configuration = ARBodyTrackingConfiguration()
        arView.session.run(configuration)
        
        arView.scene.addAnchor(characterAnchor)
  
        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 {
                character.scale = [1.0, 1.0, 1.0]
                self.character = character
                cancellable?.cancel()
            } else {
                print("Error: Unable to load model as BodyTrackedEntity")
            }
        })
    }
    
    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        for anchor in anchors {
            guard let bodyAnchor = anchor as? ARBodyAnchor else { continue }
            
            // 更新角色定位点位置的位置。
            let bodyPosition = simd_make_float3(bodyAnchor.transform.columns.3)
            characterAnchor.position = bodyPosition + characterOffset
    
            characterAnchor.orientation = Transform(matrix: bodyAnchor.transform).rotation
   
            if let character = character, character.parent == nil {
            
                // 1. the body anchor was detected and
                // 2. the character was loaded.
                characterAnchor.addChild(character)
            }
        }
    }
}

Here's the code I wrote in SwiftUI

import SwiftUI
import RealityKit
import ARKit
import Combine

struct ContentView : View {
    var body: some View {
        ARViewContainer().edgesIgnoringSafeArea(.all)
    }
}

struct ARViewContainer: UIViewRepresentable {
    var character: BodyTrackedEntity?
    let characterOffset: SIMD3<Float> = [-1.0, 0, 0] /
    let characterAnchor = AnchorEntity()
    
    func makeUIView(context: Context) -> ARView {
        
        let arView = ARView(frame: .zero)
        
        guard ARBodyTrackingConfiguration.isSupported else {
            fatalError("This feature is only supported on devices with an A12 chip")
        }
        let configuration = ARBodyTrackingConfiguration()
        arView.session.run(configuration)
        
        arView.scene.addAnchor(characterAnchor)
        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 {
                character.scale = [1.0, 1.0, 1.0]
                self.character = character
                cancellable?.cancel()
            } else {
                print("Error: Unable to load model as BodyTrackedEntity")
            }
        })
        return arView
        
    }
    
    func updateUIView(_ uiView: ARView, context: Context) {}
    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        for anchor in anchors {
            guard let bodyAnchor = anchor as? ARBodyAnchor else { continue }
            
        
            let bodyPosition = simd_make_float3(bodyAnchor.transform.columns.3)
            characterAnchor.position = bodyPosition + characterOffset
       
            characterAnchor.orientation = Transform(matrix: bodyAnchor.transform).rotation
            
            if let character = character, character.parent == nil {
            
                // 1. the body anchor was detected and
                // 2. the character was loaded.
                characterAnchor.addChild(character)
            }
        }
    }
}

#Preview {
    ContentView()
}