ContentView.swift

/// This code was created as an idiomatic version of the code demonstrated in this article:
/// https://medium.com/@robertdresler/swiftui-is-the-navigationstack-path-approach-incorrect-70ab8df8f5ac?sk=fb5869240884e1335520bc26acaaf454

import SwiftUI

@main
struct NavigationApp: App {
  
  var body: some Scene {
    WindowGroup {
      StackView()
    }
  }
}

struct StackView: View {
  
  @State var screens:  [Screen] = [.screen1, .screen2]
  
  enum Screen: CaseIterable {
    case screen1
    case screen2
    case screen3
    
    var name: String {
      switch self {
      case .screen1: return "Screen 1"
      case .screen2: return "Screen 2"
      case .screen3: return "Screen 3"
      }
    }
    
  }
  
  var body: some View {
    
    if screens == [.screen3] {
      Screen3View()
    } else {
      NavigationStack(path: $screens) {
        
        List(Screen.allCases, id: \.self) { screen in
          NavigationLink(screen.name, value: screen)
        }
        .navigationDestination(for: Screen.self) { screen in
          switch screen {
          case .screen1:
            Screen1View()
          case .screen2:
            Screen2View()
              .onTapGesture {
                screens = [.screen3]
              }
          case .screen3:
            Screen3View()
          }
        }
      }
    }
  }
}

struct Screen1View: View {
  var body: some View {
    Text("Screen1")
  }
}

struct Screen2View: View {
  
  var body: some View {
    Text("Screen2")
  }
}

struct Screen3View: View {
  var body: some View {
    Text("Screen3")
  }
}