loopfollow/LoopFollow/Application/SceneDelegate.swift

//
//  SceneDelegate.swift
//  LoopFollow
//
//  Created by Jon Fawcett on 6/1/20.
//  Copyright © 2020 Jon Fawcett. All rights reserved.
//

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    let appStateController = AppStateController()
    
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let _ = (scene as? UIWindowScene) else { return }
         
        // get the tabBar
        guard let tabBarController = window?.rootViewController as? UITabBarController,
           let viewControllers = tabBarController.viewControllers
        else {
           return
         }
                  
         // set the main controllers' connection to the app sate
         // other controllers that need to know app state are setup programatically
         for i in 0..<viewControllers.count {
            if let vc = viewControllers[i] as? MainViewController {
               vc.appStateController = appStateController
            }
            if let vc = viewControllers[i] as? NightscoutViewController {
               vc.appStateController = appStateController
            }
            if let vc = viewControllers[i] as? SettingsViewController {
               vc.appStateController = appStateController
            }
            if let vc = viewControllers[i] as? AlarmViewController {
               vc.appStateController = appStateController
            }
            if let vc = viewControllers[i] as? SnoozeViewController {
               vc.appStateController = appStateController
            }
            if let vc = viewControllers[i] as? debugViewController {
               vc.appStateController = appStateController
            }
         }
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.

        // Save changes in the application's managed object context when the application transitions to the background.
        (UIApplication.shared.delegate as? AppDelegate)?.saveContext()
    }


}