SwiftUI—如何在导航栏添加一些功能按钮

struct TrailingButtons : View{
    var body: some View {
        HStack{
            Button(action: {
                print("Download the data")
            }) {
                Image(systemName: "icloud.and.arrow.down.fill")
            }
            Button(action: {
                print("Edit the data")
            }) {
                Image(systemName: "pencil.tip.crop.circle")
            }
        }
    }
}
struct ContentView : View {
    var body: some View {
        NavigationView {
            Text("SwiftUI's NavigationView")
                .navigationBarTitle(Text("SwiftUI"))
                .navigationBarItems(leading:  Button(action: {
                       print("Go to index page")
                   }) {
                       Text("Index")
                   }, trailing: TrailingButtons())
        }
    }
}