我想在SwiftUI中隐藏导航栏，只显示后退按钮

struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello, World!")
            }
            .navigationBarHidden(true)
            .navigationBarBackButtonHidden(true)
            .navigationBarItems(leading: backButton)
        }
    }
    
    var backButton: some View {
        Button(action: {
            // 处理后退按钮点击事件
        }) {
            Image(systemName: "chevron.left")
                .foregroundColor(.blue)
        }
    }
}