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Sync timeline position using iCloud

This commit is contained in:
Shadowfacts 2022-12-23 16:35:58 -05:00
parent 619878ac85
commit 60b182ac18
9 changed files with 280 additions and 120 deletions
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4
Tusker.xcodeproj/project.pbxproj
View File

@ -219,6 +219,7 @@
D6969EA0240C8384002843CE /* EmojiLabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6969E9F240C8384002843CE /* EmojiLabel.swift */; };
D6A00B1D26379FC900316AD4 /* PollOptionsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A00B1C26379FC900316AD4 /* PollOptionsView.swift */; };
D6A3A380295515550036B6EF /* ProfileHeaderButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A3A37F295515550036B6EF /* ProfileHeaderButton.swift */; };
D6A3A3822956123A0036B6EF /* TimelinePosition.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A3A3812956123A0036B6EF /* TimelinePosition.swift */; };
D6A3BC7C232195C600FD64D5 /* ActionNotificationGroupTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A3BC7A232195C600FD64D5 /* ActionNotificationGroupTableViewCell.swift */; };
D6A3BC7D232195C600FD64D5 /* ActionNotificationGroupTableViewCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = D6A3BC7B232195C600FD64D5 /* ActionNotificationGroupTableViewCell.xib */; };
D6A3BC802321B7E600FD64D5 /* FollowNotificationGroupTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A3BC7E2321B7E600FD64D5 /* FollowNotificationGroupTableViewCell.swift */; };
@ -602,6 +603,7 @@
D6969E9F240C8384002843CE /* EmojiLabel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmojiLabel.swift; sourceTree = "<group>"; };
D6A00B1C26379FC900316AD4 /* PollOptionsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PollOptionsView.swift; sourceTree = "<group>"; };
D6A3A37F295515550036B6EF /* ProfileHeaderButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileHeaderButton.swift; sourceTree = "<group>"; };
D6A3A3812956123A0036B6EF /* TimelinePosition.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelinePosition.swift; sourceTree = "<group>"; };
D6A3BC7A232195C600FD64D5 /* ActionNotificationGroupTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActionNotificationGroupTableViewCell.swift; sourceTree = "<group>"; };
D6A3BC7B232195C600FD64D5 /* ActionNotificationGroupTableViewCell.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = ActionNotificationGroupTableViewCell.xib; sourceTree = "<group>"; };
D6A3BC7E2321B7E600FD64D5 /* FollowNotificationGroupTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FollowNotificationGroupTableViewCell.swift; sourceTree = "<group>"; };
@ -916,6 +918,7 @@
D61F759A29384F9C00C0B37F /* FilterMO.swift */,
D61F75AA293AF11400C0B37F /* FilterKeywordMO.swift */,
D6D706A62948D4D0000827ED /* TimlineState.swift */,
D6A3A3812956123A0036B6EF /* TimelinePosition.swift */,
D68A76E229524D2A001DA1B3 /* ListMO.swift */,
D68A76D929511CA6001DA1B3 /* AccountPreferences.swift */,
D60E2F2D244248BF005F8713 /* MastodonCachePersistentStore.swift */,
@ -1984,6 +1987,7 @@
D61F75B7293C119700C0B37F /* Filterer.swift in Sources */,
D64AAE9526C88C5000FC57FB /* ToastableViewController.swift in Sources */,
D6895DE928D962C2006341DA /* TimelineLikeController.swift in Sources */,
D6A3A3822956123A0036B6EF /* TimelinePosition.swift in Sources */,
D6E0DC8E216EDF1E00369478 /* Previewing.swift in Sources */,
D6B93667281D937300237D0E /* MainSidebarMyProfileCollectionViewCell.swift in Sources */,
D61F75BD293D099600C0B37F /* Lazy.swift in Sources */,

47
Tusker/CoreData/MastodonCachePersistentStore.swift
View File

@ -18,6 +18,8 @@ fileprivate let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, catego
class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
private let accountInfo: LocalData.UserAccountInfo?
private static let managedObjectModel: NSManagedObjectModel = {
let url = Bundle.main.url(forResource: "Tusker", withExtension: "momd")!
return NSManagedObjectModel(contentsOf: url)!
@ -50,6 +52,8 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
let relationshipSubject = PassthroughSubject<String, Never>()
init(for accountInfo: LocalData.UserAccountInfo?, transient: Bool = false) {
self.accountInfo = accountInfo
let group = DispatchGroup()
var instancesToMigrate: [URL]? = nil
var hashtagsToMigrate: [Hashtag]? = nil
@ -153,12 +157,17 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
}
if description.configuration == "Cloud" {
self.backgroundContext.perform {
let context = self.backgroundContext
context.perform {
instancesToMigrate?.forEach({ url in
_ = SavedInstance(url: url, account: accountInfo!, context: self.backgroundContext)
if !context.objectExists(for: SavedInstance.fetchRequest(url: url, account: accountInfo!)) {
_ = SavedInstance(url: url, account: accountInfo!, context: self.backgroundContext)
}
})
hashtagsToMigrate?.forEach({ hashtag in
_ = SavedHashtag(hashtag: hashtag, account: accountInfo!, context: self.backgroundContext)
if !context.objectExists(for: SavedHashtag.fetchRequest(name: hashtag.name, account: accountInfo!)) {
_ = SavedHashtag(hashtag: hashtag, account: accountInfo!, context: self.backgroundContext)
}
})
self.save(context: self.backgroundContext)
}
@ -435,9 +444,12 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
}
}
func getTimelineState(timeline: Timeline) -> TimelineState? {
func getTimelinePosition(timeline: Timeline) -> TimelinePosition? {
guard let accountInfo else {
return nil
}
do {
let req = TimelineState.fetchRequest(timeline: timeline)
let req = TimelinePosition.fetchRequest(timeline: timeline, account: accountInfo)
return try viewContext.fetch(req).first
} catch {
return nil
@ -483,7 +495,6 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
return changes
}
// the remote change notifications only handle deletes, inserts get handled by the regular managed object did change notifications
@objc private func remoteChanges(_ notification: Foundation.Notification) {
guard let token = notification.userInfo?[NSPersistentHistoryTokenKey] as? NSPersistentHistoryToken else {
return
@ -497,27 +508,31 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
if let result = try? self.backgroundContext.execute(req) as? NSPersistentHistoryResult,
let transactions = result.result as? [NSPersistentHistoryTransaction] {
var changes: (hashtags: Bool, instances: Bool) = (false, false)
var changedTimelinePositions: [NSManagedObjectID] = []
outer: for transaction in transactions {
for change in transaction.changes ?? [] {
if change.changedObjectID.entity.name == "SavedHashtag" {
changes.hashtags = true
} else if change.changedObjectID.entity.name == "SavedInstance" {
changes.instances = true
}
if changes.hashtags && changes.instances {
break outer
} else if change.changedObjectID.entity.name == "TimelinePosition" {
changedTimelinePositions.append(change.changedObjectID)
}
}
}
if changes.hashtags {
DispatchQueue.main.async {
DispatchQueue.main.async {
if changes.hashtags {
NotificationCenter.default.post(name: .savedHashtagsChanged, object: nil)
}
}
if changes.instances {
DispatchQueue.main.async {
if changes.instances {
NotificationCenter.default.post(name: .savedInstancesChanged, object: nil)
}
for id in changedTimelinePositions {
guard let timelinePosition = try? self.viewContext.existingObject(with: id) as? TimelinePosition else {
continue
}
NotificationCenter.default.post(name: .timelinePositionChanged, object: timelinePosition)
}
}
}
}
@ -525,3 +540,7 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
}
}
extension Foundation.Notification.Name {
static let timelinePositionChanged = Notification.Name("timelinePositionChanged")
}

83
Tusker/CoreData/TimelinePosition.swift Normal file
View File

@ -0,0 +1,83 @@
//
// TimelinePosition.swift
// Tusker
//
// Created by Shadowfacts on 12/23/22.
// Copyright © 2022 Shadowfacts. All rights reserved.
//
import Foundation
import CoreData
import Pachyderm
@objc(TimelinePosition)
public final class TimelinePosition: NSManagedObject {
@nonobjc class func fetchRequest(timeline: Timeline, account: LocalData.UserAccountInfo) -> NSFetchRequest<TimelinePosition> {
let req = NSFetchRequest<TimelinePosition>(entityName: "TimelinePosition")
req.predicate = NSPredicate(format: "accountID = %@ AND timelineKind = %@", account.id, toTimelineKind(timeline))
return req
}
@NSManaged public var accountID: String
@NSManaged private var timelineKind: String
@NSManaged public var centerStatusID: String?
@NSManaged private var statusIDsData: Data?
@LazilyDecoding(arrayFrom: \TimelinePosition.statusIDsData)
var statusIDs: [String]
var timeline: Timeline {
get { fromTimelineKind(timelineKind) }
set { timelineKind = toTimelineKind(newValue) }
}
convenience init(timeline: Timeline, account: LocalData.UserAccountInfo, context: NSManagedObjectContext) {
self.init(context: context)
self.timeline = timeline
self.accountID = account.id
}
}
// blergh, this is the simplest way of getting the Timeline into a format that A) CoreData can handle and B) is usable in the predicate
func toTimelineKind(_ timeline: Timeline) -> String {
switch timeline {
case .home:
return "home"
case .public(local: true):
return "local"
case .public(local: false):
return "federated"
case .direct:
return "direct"
case .tag(hashtag: let name):
return "hashtag:\(name)"
case .list(id: let id):
return "list:\(id)"
}
}
func fromTimelineKind(_ kind: String) -> Timeline {
if kind == "home" {
return .home
} else if kind == "local" {
return .public(local: true)
} else if kind == "federated" {
return .public(local: false)
} else if kind == "direct" {
return .direct
} else if kind.starts(with: "hashtag:") {
return .tag(hashtag: String(trimmingPrefix("hashtag:", of: kind)))
} else if kind.starts(with: "list:") {
return .list(id: String(trimmingPrefix("list:", of: kind)))
} else {
fatalError("invalid timeline kind \(kind)")
}
}
// replace with Collection.trimmingPrefix
@available(iOS, obsoleted: 16.0)
private func trimmingPrefix(_ prefix: String, of str: String) -> Substring {
return str[str.index(str.startIndex, offsetBy: prefix.count)...]
}

61
Tusker/CoreData/TimlineState.swift
View File

@ -13,10 +13,8 @@ import Pachyderm
@objc(TimelineState)
public final class TimelineState: NSManagedObject {
@nonobjc public class func fetchRequest(timeline: Timeline) -> NSFetchRequest<TimelineState> {
let req = NSFetchRequest<TimelineState>(entityName: "TimelineState")
req.predicate = NSPredicate(format: "timelineKind = %@", toTimelineKind(timeline))
return req
@nonobjc public class func fetchRequest() -> NSFetchRequest<TimelineState> {
return NSFetchRequest<TimelineState>(entityName: "TimelineState")
}
@NSManaged private var timelineKind: String
@ -25,65 +23,10 @@ public final class TimelineState: NSManagedObject {
var timeline: Timeline {
get { fromTimelineKind(timelineKind) }
set { timelineKind = toTimelineKind(newValue) }
}
var statusMOs: [StatusMO] {
statuses.array as! [StatusMO]
}
convenience init(timeline: Timeline, context: NSManagedObjectContext) {
self.init(context: context)
self.timeline = timeline
}
func setStatuses(_ statusIDs: [String]) {
let context = managedObjectContext!
// todo: this feels really inefficient, but I'm not sure if it's better or worse than doing a single "id IN %@" fetch and sorting after
let mos = statusIDs.compactMap { try? context.fetch(StatusMO.fetchRequest(id: $0)).first }
self.statuses = NSOrderedSet(array: mos)
}
}
// blergh, this is the simplest way of getting the Timeline into a format that A) CoreData can handle and B) is usable in the predicate
private func toTimelineKind(_ timeline: Timeline) -> String {
switch timeline {
case .home:
return "home"
case .public(local: true):
return "local"
case .public(local: false):
return "federated"
case .direct:
return "direct"
case .tag(hashtag: let name):
return "hashtag:\(name)"
case .list(id: let id):
return "list:\(id)"
}
}
private func fromTimelineKind(_ kind: String) -> Timeline {
if kind == "home" {
return .home
} else if kind == "local" {
return .public(local: true)
} else if kind == "federated" {
return .public(local: false)
} else if kind == "direct" {
return .direct
} else if kind.starts(with: "hashtag:") {
return .tag(hashtag: String(trimmingPrefix("hashtag:", of: kind)))
} else if kind.starts(with: "list:") {
return .list(id: String(trimmingPrefix("list:", of: kind)))
} else {
fatalError("invalid timeline kind \(kind)")
}
}
// replace with Collection.trimmingPrefix
@available(iOS, obsoleted: 16.0)
private func trimmingPrefix(_ prefix: String, of str: String) -> Substring {
return str[str.index(str.startIndex, offsetBy: prefix.count)...]
}

7
Tusker/CoreData/Tusker.xcdatamodeld/Tusker.xcdatamodel/contents
View File

@ -117,6 +117,12 @@
</uniquenessConstraint>
</uniquenessConstraints>
</entity>
<entity name="TimelinePosition" representedClassName="TimelinePosition" syncable="YES">
<attribute name="accountID" optional="YES" attributeType="String"/>
<attribute name="centerStatusID" optional="YES" attributeType="String"/>
<attribute name="statusIDsData" optional="YES" attributeType="Binary" valueTransformerName="TimelinePositionStatusIDsTransformer"/>
<attribute name="timelineKind" optional="YES" attributeType="String"/>
</entity>
<entity name="TimelineState" representedClassName="TimelineState" syncable="YES">
<attribute name="centerStatusID" optional="YES" attributeType="String"/>
<attribute name="timelineKind" attributeType="String" valueTransformerName="pachydermTimeline" customClassName="Tusker.TimelineContainer"/>
@ -126,6 +132,7 @@
<memberEntity name="SavedHashtag"/>
<memberEntity name="SavedInstance"/>
<memberEntity name="AccountPreferences"/>
<memberEntity name="TimelinePosition"/>
</configuration>
<configuration name="Local">
<memberEntity name="Account"/>

2
Tusker/Scenes/MainSceneDelegate.swift
View File

@ -131,7 +131,7 @@ class MainSceneDelegate: UIResponder, UIWindowSceneDelegate, TuskerSceneDelegate
minDate.addTimeInterval(-7 * 24 * 60 * 60)
let statusReq: NSFetchRequest<NSFetchRequestResult> = StatusMO.fetchRequest()
statusReq.predicate = NSPredicate(format: "((lastFetchedAt = nil) OR (lastFetchedAt < %@)) AND (timelines.@count = 0)", minDate as NSDate)
statusReq.predicate = NSPredicate(format: "(lastFetchedAt = nil) OR (lastFetchedAt < %@)", minDate as NSDate)
let deleteStatusReq = NSBatchDeleteRequest(fetchRequest: statusReq)
deleteStatusReq.resultType = .resultTypeCount
if let res = try? context.execute(deleteStatusReq) as? NSBatchDeleteResult {

179
Tusker/Screens/Timeline/TimelineViewController.swift
View File

@ -25,6 +25,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
private(set) var collectionView: UICollectionView!
private(set) var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
private var cancellables = Set<AnyCancellable>()
private var contentOffsetObservation: NSKeyValueObservation?
private var activityToRestore: NSUserActivity?
// the last time this VC disappeared or the scene was backgrounded while it was active, used to decide if we want to check for present when reappearing
@ -121,6 +122,21 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
NotificationCenter.default.addObserver(self, selector: #selector(sceneWillEnterForeground), name: UIScene.willEnterForegroundNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(sceneDidEnterBackground), name: UIScene.didEnterBackgroundNotification, object: nil)
NotificationCenter.default.publisher(for: .timelinePositionChanged)
.filter { [unowned self] in
if let timelinePosition = $0.object as? TimelinePosition,
timelinePosition.accountID == self.mastodonController.accountInfo?.id,
timelinePosition.timeline == self.timeline {
return true
} else {
return false
}
}
.debounce(for: .milliseconds(500), scheduler: DispatchQueue.main)
.sink { [unowned self] _ in
_ = promptToSyncPositionIfNecessary()
}
.store(in: &cancellables)
}
// separate method because InstanceTimelineViewController needs to be able to customize it
@ -209,7 +225,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
}
}
} else {
checkPresentIfEnoughTimeElapsed()
if promptToSyncPositionIfNecessary() {
// no-op
} else {
checkPresentIfEnoughTimeElapsed()
}
}
}
@ -233,19 +253,29 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
saveState()
}
private func saveState() {
guard isViewLoaded,
persistsState else {
return
}
private func currentCenterVisibleIndexPath(snapshot: NSDiffableDataSourceSnapshot<Section, Item>?) -> IndexPath? {
let snapshot = snapshot ?? dataSource.snapshot()
let visible = collectionView.indexPathsForVisibleItems.sorted()
let snapshot = dataSource.snapshot()
let visibleRect = CGRect(origin: collectionView.contentOffset, size: collectionView.bounds.size)
let midPoint = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
guard !visible.isEmpty,
let statusesSection = snapshot.sectionIdentifiers.firstIndex(of: .statuses),
let rawCenterVisible = collectionView.indexPathForItem(at: midPoint),
let centerVisible = visible.first(where: { $0.section == statusesSection && $0 >= rawCenterVisible }) else {
return nil
}
return centerVisible
}
private func saveState() {
guard isViewLoaded,
persistsState,
let accountInfo = mastodonController.accountInfo else {
return
}
let snapshot = dataSource.snapshot()
guard let centerVisible = currentCenterVisibleIndexPath(snapshot: snapshot) else {
return
}
let allItems = snapshot.itemIdentifiers(inSection: .statuses)
@ -288,10 +318,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
}
stateRestorationLogger.debug("TimelineViewController: saving state to persistent store with with centerID \(centerVisibleID)")
let state = mastodonController.persistentContainer.getTimelineState(timeline: timeline) ?? TimelineState(timeline: timeline, context: mastodonController.persistentContainer.viewContext)
state.setStatuses(ids)
state.centerStatusID = centerVisibleID
mastodonController.persistentContainer.save(context: mastodonController.persistentContainer.viewContext)
let context = mastodonController.persistentContainer.viewContext
let position = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) ?? TimelinePosition(timeline: timeline, account: accountInfo, context: context)
position.statusIDs = ids
position.centerStatusID = centerVisibleID
mastodonController.persistentContainer.save(context: context)
}
func stateRestorationActivity() -> NSUserActivity? {
@ -304,45 +335,68 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
return activity
}
private func restoreState() -> Bool {
func restoreState() -> Bool {
guard persistsState,
Preferences.shared.timelineStateRestoration,
let state = mastodonController.persistentContainer.getTimelineState(timeline: timeline) else {
let position = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) else {
return false
}
let statusIDs = state.statusMOs.map(\.id)
loadViewIfNeeded()
controller.restoreInitial {
var snapshot = dataSource.snapshot()
snapshot.appendSections([.statuses])
let items = statusIDs.map { Item.status(id: $0, collapseState: .unknown, filterState: .unknown) }
snapshot.appendItems(items, toSection: .statuses)
dataSource.apply(snapshot, animatingDifferences: false) {
if let centerID = state.centerStatusID,
let index = statusIDs.firstIndex(of: centerID),
let indexPath = self.dataSource.indexPath(for: items[index]) {
// it sometimes takes multiple attempts to convert on the right scroll position
// since we're dealing with a bunch of unmeasured cells, so just try a few times in a loop
var count = 0
while count < 5 {
count += 1
let origOffset = self.collectionView.contentOffset
self.collectionView.layoutIfNeeded()
self.collectionView.scrollToItem(at: indexPath, at: .centeredVertically, animated: false)
let newOffset = self.collectionView.contentOffset
if abs(origOffset.y - newOffset.y) <= 1 {
break
}
}
stateRestorationLogger.fault("TimelineViewController: restored statuses with center ID \(centerID)")
} else {
stateRestorationLogger.fault("TimelineViewController: restored statuses, but couldn't find center ID")
}
Task {
await controller.restoreInitial {
await loadStatusesToRestore(position: position)
applyItemsToRestore(position: position)
}
}
return true
}
@MainActor
private func loadStatusesToRestore(position: TimelinePosition) async {
let unloaded = position.statusIDs.filter({ mastodonController.persistentContainer.status(for: $0) == nil })
guard !unloaded.isEmpty else {
return
}
await withTaskGroup(of: Void.self) { group in
for id in unloaded {
group.addTask { @MainActor in
if let (status, _) = try? await self.mastodonController.run(Client.getStatus(id: id)) {
self.mastodonController.persistentContainer.addOrUpdate(status: status)
}
}
}
}
}
private func applyItemsToRestore(position: TimelinePosition) {
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
snapshot.appendSections([.statuses])
let items = position.statusIDs.map { Item.status(id: $0, collapseState: .unknown, filterState: .unknown) }
snapshot.appendItems(items, toSection: .statuses)
dataSource.apply(snapshot, animatingDifferences: false) {
if let centerID = position.centerStatusID,
let index = position.statusIDs.firstIndex(of: centerID),
let indexPath = self.dataSource.indexPath(for: items[index]) {
// it sometimes takes multiple attempts to convert on the right scroll position
// since we're dealing with a bunch of unmeasured cells, so just try a few times in a loop
var count = 0
while count < 5 {
count += 1
let origOffset = self.collectionView.contentOffset
self.collectionView.layoutIfNeeded()
self.collectionView.scrollToItem(at: indexPath, at: .centeredVertically, animated: false)
let newOffset = self.collectionView.contentOffset
if abs(origOffset.y - newOffset.y) <= 1 {
break
}
}
stateRestorationLogger.fault("TimelineViewController: restored statuses with center ID \(centerID)")
} else {
stateRestorationLogger.fault("TimelineViewController: restored statuses, but couldn't find center ID")
}
}
}
private func removeTimelineDescriptionCell() {
var snapshot = dataSource.snapshot()
snapshot.deleteItems([.publicTimelineDescription])
@ -394,7 +448,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
view.window?.windowScene == scene else {
return
}
checkPresentIfEnoughTimeElapsed()
if promptToSyncPositionIfNecessary() {
// no-op
} else {
checkPresentIfEnoughTimeElapsed()
}
}
@objc private func sceneDidEnterBackground(_ notification: Foundation.Notification) {
@ -407,6 +465,45 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
saveState()
}
private func promptToSyncPositionIfNecessary() -> Bool {
guard persistsState,
let timelinePosition = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) else {
return false
}
let snapshot = dataSource.snapshot()
guard let centerVisible = currentCenterVisibleIndexPath(snapshot: snapshot),
snapshot.sectionIdentifiers.contains(.statuses) else {
return false
}
let statusesSection = snapshot.itemIdentifiers(inSection: .statuses)
let centerVisibleStatusID: String
switch statusesSection[centerVisible.row] {
case .gap:
guard case .status(let id, _, _) = statusesSection[centerVisible.row + 1] else {
fatalError()
}
centerVisibleStatusID = id
case .status(let id, _, _):
centerVisibleStatusID = id
default:
fatalError()
}
guard timelinePosition.centerStatusID != centerVisibleStatusID else {
return false
}
var config = ToastConfiguration(title: "Sync Position")
config.edge = .top
config.dismissAutomaticallyAfter = 5
config.systemImageName = "arrow.triangle.2.circlepath"
config.action = { [unowned self] toast in
toast.dismissToast(animated: true)
_ = self.restoreState()
}
showToast(configuration: config, animated: true)
UIAccessibility.post(notification: .announcement, argument: "Synced Position Updated")
return true
}
@objc func refresh() {
Task {
if case .notLoadedInitial = controller.state {

9
Tusker/Screens/Timeline/TimelinesPageViewController.swift
View File

@ -53,7 +53,14 @@ class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageView
await vc.checkPresent(jumpImmediately: true)
}
return true
})
}),
UIAccessibilityCustomAction(name: "Jump to Sync Position", actionHandler: { [unowned self] _ in
guard let vc = currentViewController as? TimelineViewController else {
return false
}
_ = vc.restoreState()
return true
}),
]
pinnedTimelinesObservation = mastodonController.accountPreferences.observe(\.pinnedTimelinesData, changeHandler: { [unowned self] _, _ in

8
Tusker/TimelineLikeController.swift
View File

@ -80,12 +80,12 @@ class TimelineLikeController<Item> {
}
/// Used to indicate to the controller that the initial set of posts have been restored externally.
func restoreInitial(doRestore: () -> Void) {
guard state == .notLoadedInitial else {
func restoreInitial(doRestore: () async -> Void) async {
guard state == .notLoadedInitial || state == .idle else {
return
}
state = .restoringInitial
doRestore()
await doRestore()
state = .idle
}
@ -234,7 +234,7 @@ class TimelineLikeController<Item> {
}
case .idle:
switch to {
case .loadingInitial(_, _), .loadingNewer(_), .loadingOlder(_, _), .loadingGap(_, _):
case .restoringInitial, .loadingInitial(_, _), .loadingNewer(_), .loadingOlder(_, _), .loadingGap(_, _):
return true
default:
return false