struct ContentView: View {
   @Environment(ApplicationData.self) private var appData

   var body: some View {
      NavigationStack {
         List(appData.userData) { book in
            NavigationLink(destination: {
               DetailView(book: book)
            }, label: {
               CellBook(book: book)
            })
         }.navigationTitle(Text("Books"))
      }
   }
}