LiveSynchronizationController.swft usage

AppDelegate.swift

import SwiftTweaks
import FirebaseCore
import Fabric
import Crashlytics
import SwiftyUserDefaults
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    let rootViewController = RootViewController()
    let userNotificationsDelegate = UserNotificationsDelegate()
    
    func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        NotificationCenter.default.addObserver(self, selector: #selector(liveSynchronizationConnected(_:)), name: .liveSynchronizationConnected, object: nil)

        window = UIWindow(frame: UIScreen.main.bounds)
        rootViewController.showRootViewController(into: window)
        window?.backgroundColor = UIColor.white
        window?.makeKeyAndVisible()
        
        return true
    }

    func applicationWillResignActive(_: UIApplication) {
        LiveSynchronizationController.shared.disconnect()
    }

    func applicationDidEnterBackground(_: UIApplication) {
        LiveSynchronizationController.shared.disconnect()
    }

    func applicationWillEnterForeground(_: UIApplication) {
    }

    func applicationDidBecomeActive(_: UIApplication) {
        AppSynchronization.fullSynchronization()
        LiveSynchronizationController.shared.connect()
    }

    func applicationWillTerminate(_: UIApplication) {
        LiveSynchronizationController.shared.disconnect()
    }

    @objc private func liveSynchronizationConnected(_: Notification) {
        LiveSynchronizationController.shared.subscribe(topic: "id")
    }
}