import SwiftUI

struct NumberDetail: View { let n: Int; var body: some View { Text("Number: \(n)") } }

struct NavStackPathDemo: View {
  @State private var path: [Int] = []
  var body: some View {
    NavigationStack(path: $path) {
      VStack(spacing: 12) {
        Button("Go to 7") { path.append(7) }
        Button("Back") { if !path.isEmpty { _ = path.removeLast() } }
      }
      .navigationDestination(for: Int.self) { n in NumberDetail(n: n) }
      .navigationTitle("Path Demo")
    }
  }
}

                    

import SwiftUI

struct ContentView: View {
  var body: some View { NavStackPathDemo() }
}

                    

import SwiftUI

@main
struct MyApp: App {
  var body: some Scene { WindowGroup { ContentView() } }
}