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67 lines
2.3 KiB
Swift
67 lines
2.3 KiB
Swift
import CoreData
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#if os(iOS)
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import UIKit
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#elseif os(macOS)
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import AppKit
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#endif
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class LocalStorageManager {
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static let persistentContainer: NSPersistentContainer = {
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let container = NSPersistentContainer(name: "LocalStorageModel")
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container.loadPersistentStores { _, error in
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container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
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if let error = error {
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fatalError("Unresolved error loading persistent store: \(error)")
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}
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}
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return container
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}()
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init() {
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let center = NotificationCenter.default
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#if os(iOS)
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let notification = UIApplication.willResignActiveNotification
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#elseif os(macOS)
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let notification = NSApplication.willResignActiveNotification
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#endif
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// We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
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// system will clean this up the next time it would be posted to.
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// See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
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// And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
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// swiftlint:disable:next discarded_notification_center_observer
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center.addObserver(forName: notification, object: nil, queue: nil, using: self.saveContextOnResignActive)
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}
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func saveContext() {
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if LocalStorageManager.persistentContainer.viewContext.hasChanges {
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do {
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try LocalStorageManager.persistentContainer.viewContext.save()
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} catch {
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print("Error saving context: \(error)")
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}
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}
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}
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func purgeUserCollections() {
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let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFACollection")
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let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
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do {
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try LocalStorageManager.persistentContainer.persistentStoreCoordinator.execute(
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deleteRequest, with: LocalStorageManager.persistentContainer.viewContext
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)
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} catch {
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print("Error: Failed to purge cached collections.")
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}
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}
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}
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private extension LocalStorageManager {
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func saveContextOnResignActive(_ notification: Notification) {
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saveContext()
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}
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}
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