请看下面的代码。使用该代码我可以看到工具栏项没有任何问题。但如果我删除或替换navigationView与例如一个VSack的工具栏项消失。
是否可以在没有navigationView/navigationStack的情况下添加工具栏项？我对这种可能性特别感兴趣，因为它可以解决我在多个相互连接的视图中使用多个navigationView的问题。
工作代码：

import SwiftUI

struct Restaurant: Identifiable {
    let id = UUID()
    let name: String
}

// A view that shows the data for one Restaurant.
struct RestaurantRow: View {
    var restaurant: Restaurant

    var body: some View {
        Text("Come and eat at \(restaurant.name)")
    }
}

// Create three restaurants, then show them in a list.
struct SwiftUIView: View {
    let restaurants = [
        Restaurant(name: "Joe's Original"),
        Restaurant(name: "The Real Joe's Original"),
        Restaurant(name: "Original Joe's")
    ]
    
    var body: some View {
        NavigationStack {
            List(restaurants) { restaurant in
                RestaurantRow(restaurant: restaurant)
            }
            .toolbar {
                ToolbarItem(placement: .automatic) {
                    Text("Great Toolbar")
                }
            }
        }
    }
}

struct SwiftUIView_Previews: PreviewProvider {
    static var previews: some View {
        SwiftUIView()
    }
}

不显示工具栏项的代码：

var body: some View {
        VStack {
            List(restaurants) { restaurant in
                RestaurantRow(restaurant: restaurant)
            }
            .toolbar {
                ToolbarItem(placement: .automatic) {
                    Text("Great Toolbar")
                }
            }
        }
    }
}

删除了navigationView，将其替换为其他内容，如VStack。