如何在显示另一个swiftUI视图时停止摄像头工作？

import SwiftUI
import Combine

class CameraManager: ObservableObject {
    @Published var isCameraRunning = false
    
    func startCamera() {
        // 启动摄像头的代码
        isCameraRunning = true
    }
    
    func stopCamera() {
        // 停止摄像头的代码
        isCameraRunning = false
    }
}

struct ContentView: View {
    @State private var showCameraView = false
    @StateObject private var cameraManager = CameraManager()
    
    var body: some View {
        VStack {
            Button(action: {
                showCameraView.toggle()
            }) {
                Text(showCameraView ? "停止摄像头并返回" : "启动摄像头")
            }
            
            if showCameraView {
                CameraView(cameraManager: cameraManager)
                    .onDisappear {
                        cameraManager.stopCamera()
                    }
            }
        }
    }
}

struct CameraView: View {
    @ObservedObject var cameraManager: CameraManager
    
    var body: some View {
        Text("摄像头正在运行")
            .onAppear {
                cameraManager.startCamera()
            }
    }
}