如何在SwiftUI中设置清晰/透明背景的导航栏？

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            ZStack {
                Image("background-image") // 替换为您的背景图片
                    .resizable()
                    .aspectRatio(contentMode: .fill)
                    .edgesIgnoringSafeArea(.all)
                
                VStack {
                    Text("Hello, SwiftUI!")
                        .font(.largeTitle)
                        .foregroundColor(.white)
                        .padding()
                }
            }
            .background(Color.black.opacity(0.5)) // 设置半透明的黑色背景
            .edgesIgnoringSafeArea(.all)
        }
        .navigationViewStyle(StackNavigationViewStyle())
        .navigationBarTitle("SwiftUI NavigationBar")
        .navigationBarItems(trailing:
            Button(action: {
                print("Tapped!")
            }) {
                Image(systemName: "plus")
            }
        )
    }
}

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