fix offline mode. (#72)

Shared/AppDelegate.swift

@@ -0,0 +1,63 @@
+import BackgroundTasks
+import Foundation
+import SwiftUI
+import HackerNewsKit
+import UserNotifications
+
+class AppDelegate: NSObject, UIApplicationDelegate {
+ func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+ BGTaskScheduler.shared.register(forTaskWithIdentifier: Constants.Download.backgroundTaskId,
+ using: nil) { task in
+ task.expirationHandler = {
+ task.setTaskCompleted(success: false)
+ }
+
+ Task {
+ await OfflineRepository.shared.downloadAllStories()
+
+ task.setTaskCompleted(success: true)
+ }
+
+ OfflineRepository.shared.scheduleBackgroundDownload()
+ }
+ }
+
+ func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+ UNUserNotificationCenter.current().delegate = self
+ return true
+ }
+
+ func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+ // Register SceneDelegate.
+ let sceneConfig = UISceneConfiguration(name: nil, sessionRole: connectingSceneSession.role)
+ sceneConfig.delegateClass = SceneDelegate.self
+ return sceneConfig
+ }
+
+ private func configureUserNotifications() {
+ UNUserNotificationCenter.current().delegate = self
+ }
+}
+
+class SceneDelegate: NSObject, UIWindowSceneDelegate {
+ func sceneDidEnterBackground(_ scene: UIScene) {
+ OfflineRepository.shared.scheduleBackgroundDownload()
+ }
+}
+
+extension AppDelegate: UNUserNotificationCenterDelegate {
+ func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
+ completionHandler([.banner, .sound, .list])
+ }
+
+ func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
+ Task {
+ let content = response.notification.request.content
+ if let id = Int(content.targetContentIdentifier ?? ""),
+ id != 0,
+ let item = await StoriesRepository.shared.fetchComment(id) {
+ Router.shared.to(item)
+ }
+ }
+ }
+}

Shared/Models/Stores/ItemStore.swift

@@ -20,8 +20,9 @@ extension ItemView {
  private var cancellable: AnyCancellable?
 
  init() {
- cancellable = NetworkMonitor.shared.networkStatus.sink { isConnected in
- self.isConnectedToNetwork = isConnected
+ cancellable = NetworkMonitor.shared.networkStatus
+ .sink { isConnected in
+ self.isConnectedToNetwork = isConnected ?? false
  }
  }
 

Shared/Models/Stores/StoryStore.swift

@@ -17,9 +17,10 @@ extension HomeView {
  private var cancellable: AnyCancellable?
 
  init() {
- cancellable = NetworkMonitor.shared.networkStatus.sink { isConnected in
- self.isConnectedToNetwork = isConnected
- }
+ cancellable = NetworkMonitor.shared.networkStatus
+ .sink { isConnected in
+ self.isConnectedToNetwork = isConnected ?? false
+ }
  }
 
  func fetchStories(status: Status = .inProgress) async {

Shared/Services/OfflineRepository.swift

@@ -1,4 +1,6 @@
 import Alamofire
+import BackgroundTasks
+import Combine
 import Foundation
 import SwiftUI
 import SwiftData
@@ -12,15 +14,35 @@ public class OfflineRepository: ObservableObject {
  @Published var isDownloading = false
  @Published var completionCount = 0
 
+ lazy var lastFetchedAt = {
+ guard let date = UserDefaults.standard.object(forKey: lastDownloadAtKey) as? Date else { return "" }
+ let df = DateFormatter()
+ df.dateFormat = "MM/dd/yyyy HH:mm"
+ return df.string(from: date)
+ }()
+ var isInMemory = false
+
  private let storiesRepository = StoriesRepository.shared
  private let container = try! ModelContainer(for: StoryCollection.self, CommentCollection.self)
  private let downloadOrder = [StoryType.top, .ask, .best]
+ private let lastDownloadAtKey = "lastDownloadedAt"
  private var stories = [StoryType: [Story]]()
  private var comments = [Int: [Comment]]()
+ private var cancellable: AnyCancellable?
 
  public static let shared: OfflineRepository = .init()
 
- private init() {
+ init() {
+ cancellable = NetworkMonitor.shared.networkStatus
+ .dropFirst()
+ .sink { isConnected in
+ if let isConnected = isConnected, !self.isInMemory && !isConnected {
+ self.loadIntoMemory()
+ }
+ }
+ }
+
+ public func loadIntoMemory() {
  let context = container.mainContext
 
  // Fetch all cached stories.
@@ -39,13 +61,30 @@ public class OfflineRepository: ObservableObject {
  comments[collection.parentId] = collection.comments
  }
  }
+
+ isInMemory = true
+ }
+
+ public func scheduleBackgroundDownload() {
+ let downloadTask = BGProcessingTaskRequest(identifier: Constants.Download.backgroundTaskId)
+ // Set earliestBeginDate to be 1 hr from now.
+ downloadTask.earliestBeginDate = Date(timeIntervalSinceNow: 3600)
+ downloadTask.requiresNetworkConnectivity = true
+ downloadTask.requiresExternalPower = true
+ do {
+ try BGTaskScheduler.shared.submit(downloadTask)
+ } catch {
+ debugPrint("Unable to submit task: \(error.localizedDescription)")
+ }
  }
 
  // MARK: - Story related.
 
  public func downloadAllStories() async -> Void {
  isDownloading = true
 
+ UserDefaults.standard.set(Date.now, forKey: lastDownloadAtKey)
+
  let context = container.mainContext
  var completedStoryId = Set<Int>()
 
@@ -93,29 +132,11 @@ public class OfflineRepository: ObservableObject {
  }
 
  public func fetchAllStories(from storyType: StoryType) -> [Story] {
- return stories[storyType] ?? [Story]()
- }
-
- public func fetchStoryIds(from storyType: StoryType) async -> [Int] {
- return [Int]()
- }
-
- public func fetchStoryIds(from storyType: String) async -> [Int] {
- return [Int]()
- }
-
- public func fetchStory(_ id: Int) async -> Story? {
- return nil
-// let context = container.mainContext
-// var descriptor = FetchDescriptor<StoryCollection>(
-// predicate: #Predicate { $0.id == id }
-// )
-// descriptor.fetchLimit = 1
-// if let results = try? context.fetch(descriptor) {
-// return results.first?.story
-// } else {
-// return nil
-// }
+ guard let stories = stories[storyType] else { return [Story]() }
+ let storiesWithCommentsDownloaded = stories.filter { story in
+ comments[story.id].isNotNullOrEmpty
+ }
+ return storiesWithCommentsDownloaded
  }
 
  // MARK: - Comment related.

Shared/Utilities/Constants.swift

@@ -22,4 +22,8 @@ struct Constants {
  static let lastFetchedAtKey = "lastFetchedAt"
  static let backgroundTaskId = "fetchReplies"
  }
+
+ struct Download {
+ static let backgroundTaskId = "download"
+ }
 }

Shared/Utilities/NetworkMonitor.swift

@@ -2,7 +2,7 @@ import Network
 import Combine
 
 final class NetworkMonitor {
- let networkStatus = CurrentValueSubject<Bool, Never>(true)
+ let networkStatus = CurrentValueSubject<Bool?, Never>(nil)
  var onWifi = true
  var onCellular = true
 

Shared/Views/Components/ItemRow.swift

@@ -44,10 +44,9 @@ struct ItemRow: View {
  Label("View on Hacker News", systemImage: "safari")
  }
  } label: {
- Image(systemName: "ellipsis")
+ Label(String(), systemImage: "ellipsis")
  .padding(.leading)
  .padding(.bottom, 12)
- .padding(.trailing)
  .foregroundColor(.orange)
  }
  }

Shared/Views/HomeView.swift

@@ -120,9 +120,12 @@ struct HomeView: View {
  Text("\(offlineRepository.completionCount) completed")
  } else {
  Label("Download all stories", systemImage: "square.and.arrow.down")
+ if offlineRepository.lastFetchedAt.isNotEmpty {
+ Text("last downloaded at \(offlineRepository.lastFetchedAt)")
+ }
  }
  }
- .disabled(offlineRepository.isDownloading)
+ .disabled(offlineRepository.isDownloading || !storyStore.isConnectedToNetwork)
  Divider()
  AuthButton(showLoginDialog: $showLoginDialog, showLogoutDialog: $showLogoutDialog)
  Button {

Shared/ZCombinatorApp.swift

@@ -1,3 +1,5 @@
+import BackgroundTasks
+import Foundation
 import SwiftUI
 import SwiftData
 import HackerNewsKit
@@ -9,6 +11,7 @@ struct ZCombinatorApp: App {
  @Environment(\.scenePhase) private var phase
  let auth: Authentication = .shared
  let notification: AppNotification = .shared
+ let offlineRepository: OfflineRepository = .shared
 
  var body: some Scene {
  WindowGroup {
@@ -29,31 +32,3 @@ struct ZCombinatorApp: App {
  }
  }
 }
-
-class AppDelegate: NSObject, UIApplicationDelegate {
- func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
- UNUserNotificationCenter.current().delegate = self
- return true
- }
-
- private func configureUserNotifications() {
- UNUserNotificationCenter.current().delegate = self
- }
-}
-
-extension AppDelegate: UNUserNotificationCenterDelegate {
- func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
- completionHandler([.banner, .sound, .list])
- }
-
- func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
- Task {
- let content = response.notification.request.content
- if let id = Int(content.targetContentIdentifier ?? ""),
- id != 0,
- let item = await StoriesRepository.shared.fetchComment(id) {
- Router.shared.to(item)
- }
- }
- }
-}

ZCombinator--iOS--Info.plist

@@ -4,6 +4,7 @@
 <dict>
  <key>BGTaskSchedulerPermittedIdentifiers</key>
  <array>
+ <string>download</string>
  <string>fetchReplies</string>
  </array>
  <key>CFBundleURLTypes</key>

ZCombinator.xcodeproj/project.pbxproj

@@ -85,6 +85,7 @@
  E5A2CECF2A08B94200D683C6 /* ShareViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = E5A2CECE2A08B94200D683C6 /* ShareViewController.swift */; };
  E5A2CED22A08B94200D683C6 /* MainInterface.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = E5A2CED02A08B94200D683C6 /* MainInterface.storyboard */; };
  E5A2CED62A08B94200D683C6 /* ShareExtension.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = E5A2CECC2A08B94200D683C6 /* ShareExtension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
+ E5B5B91F2AB78748005CE503 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = E5B5B91E2AB78748005CE503 /* AppDelegate.swift */; };
  E5BF9E6B2A0CAA5C0030E588 /* SwiftSoup in Frameworks */ = {isa = PBXBuildFile; productRef = E5BF9E6A2A0CAA5C0030E588 /* SwiftSoup */; };
  E5C448DB2AB6B17A006C023B /* NetworkMonitor.swift in Sources */ = {isa = PBXBuildFile; fileRef = E5C448DA2AB6B17A006C023B /* NetworkMonitor.swift */; };
  E5C448E02AB6CD64006C023B /* CommentCollection.swift in Sources */ = {isa = PBXBuildFile; fileRef = E5C448DF2AB6CD64006C023B /* CommentCollection.swift */; };
@@ -233,6 +234,7 @@
  E5A2CECE2A08B94200D683C6 /* ShareViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareViewController.swift; sourceTree = "<group>"; };
  E5A2CED12A08B94200D683C6 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/MainInterface.storyboard; sourceTree = "<group>"; };
  E5A2CED32A08B94200D683C6 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+ E5B5B91E2AB78748005CE503 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
  E5C448DA2AB6B17A006C023B /* NetworkMonitor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetworkMonitor.swift; sourceTree = "<group>"; };
  E5C448DF2AB6CD64006C023B /* CommentCollection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CommentCollection.swift; sourceTree = "<group>"; };
  E5C7B9792A086C9A00CA6066 /* CommentTile.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CommentTile.swift; sourceTree = "<group>"; };
@@ -369,6 +371,7 @@
  E50FB9CA2886738B00AA325C /* ZCombinatorApp.swift */,
  E50FB9CD2886738D00AA325C /* Assets.xcassets */,
  E50FB9C82886738B00AA325C /* ZCombinator.xcdatamodeld */,
+ E5B5B91E2AB78748005CE503 /* AppDelegate.swift */,
  );
  path = Shared;
  sourceTree = "<group>";
@@ -843,6 +846,7 @@
  E5C7B97E2A0887D600CA6066 /* ProfileView.swift in Sources */,
  E5687FAD289E194A00901F1F /* TextView.swift in Sources */,
  E57640322A0302A10075F5D1 /* FlagButton.swift in Sources */,
+ E5B5B91F2AB78748005CE503 /* AppDelegate.swift in Sources */,
  E54B013A29FC9FB500F7F0A0 /* View+ShareSheet.swift in Sources */,
  E50FB9F32886738D00AA325C /* ZCombinator.xcdatamodeld in Sources */,
  E5C7B97C2A08706000CA6066 /* View+GetColor.swift in Sources */,
@@ -1081,7 +1085,7 @@
  ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
  CODE_SIGN_ENTITLEMENTS = "ZCombinator (iOS).entitlements";
  CODE_SIGN_STYLE = Automatic;
- CURRENT_PROJECT_VERSION = 11;
+ CURRENT_PROJECT_VERSION = 13;
  DEVELOPMENT_TEAM = QMWX3X2NF7;
  ENABLE_PREVIEWS = YES;
  GENERATE_INFOPLIST_FILE = YES;
@@ -1119,7 +1123,7 @@
  ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
  CODE_SIGN_ENTITLEMENTS = "ZCombinator (iOS).entitlements";
  CODE_SIGN_STYLE = Automatic;
- CURRENT_PROJECT_VERSION = 11;
+ CURRENT_PROJECT_VERSION = 13;
  DEVELOPMENT_TEAM = QMWX3X2NF7;
  ENABLE_PREVIEWS = YES;
  GENERATE_INFOPLIST_FILE = YES;