PersistenceManager.swift
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PersistenceManager.swift
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	import CoreData

	#if os(iOS)
	import UIKit
	#elseif os(macOS)
	import AppKit
	#endif

	class PersistenceManager {
	static let persistentContainer: NSPersistentContainer = {
	let container = NSPersistentContainer(name: "LocalStorageModel")
	container.loadPersistentStores { _, error in
	container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
	if let error = error {
	fatalError("Unresolved error loading persistent store: \(error)")
	}
	}
	return container
	}()

	init() {
	let center = NotificationCenter.default

	#if os(iOS)
	let notification = UIApplication.willResignActiveNotification
	#elseif os(macOS)
	let notification = NSApplication.willResignActiveNotification
	#endif

	// We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
	// system will clean this up the next time it would be posted to.
	// See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
	// And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
	// swiftlint:disable:next discarded_notification_center_observer
	center.addObserver(forName: notification, object: nil, queue: nil) { [weak self] _ in
	guard let self = self else { return }
	self.saveContext()
	}
	}

	func saveContext() {
	if PersistenceManager.persistentContainer.viewContext.hasChanges {
	do {
	try PersistenceManager.persistentContainer.viewContext.save()
	} catch {
	print("Error saving context: \(error)")
	}
	}
	}
	}