SimpleToDoApp main app file

SimpleToDoApp.swift

//
// SimpleToDoApp.swift
// SimpleToDo
//
// Copyright © 2022 Paul Hudson.
// Licensed under MIT license.
//
// https://github.com/twostraws/simple-swiftui
// See LICENSE for license information
//

import SwiftUI

/// The main struct for our app, responsible for creating the view model, setting up our
/// basic user interface, and also triggering a save when the app moves to the background.
@main
struct SimpleToDoApp: App {
  /// The main shared instance of our view model, created here once and sent into `ContentView`.
  @StateObject private var model = ViewModel()

  /// Used to detect when the app moves all scenes to the background, so we can trigger a save.
  @Environment(\.scenePhase) var scenePhase

  var body: some Scene {
    WindowGroup {
      NavigationView {
        ContentView(model: model)
        SelectSomethingView()
      }
    }
    .onChange(of: scenePhase) { phase in
      // When all our scenes have moved to the background, we force a save
      // immediately in case the user is about to terminate the app.
      if phase == .background {
        model.save()
      }
    }
  }
}