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LocalStorageManager.swift
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LocalStorageManager.swift
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import CoreData
#if os(iOS)
import UIKit
#elseif os(macOS)
import AppKit
#endif
class LocalStorageManager {
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, using: self.saveContextOnResignActive)
}
func saveContext() {
if LocalStorageManager.persistentContainer.viewContext.hasChanges {
do {
try LocalStorageManager.persistentContainer.viewContext.save()
} catch {
print("Error saving context: \(error)")
}
}
}
func purgeUserCollections() {
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFACollection")
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
do {
try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest)
} catch {
print("Error: Failed to purge cached collections.")
}
}
}
private extension LocalStorageManager {
func saveContextOnResignActive(_ notification: Notification) {
saveContext()
}
}

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