added remembering which feed source is selected

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add empty state for lists/relays drop-down.
 - Added support for decrypting private tags in kind 30000 lists.
 - Added pop-up tip for feed customization. [#101](https://github.com/verse-pbc/issues/issues/101)
+- Added remembering which feed source is selected.
 
 ### Internal Changes
 - Upgraded to Xcode 16. [#1570](https://github.com/planetary-social/nos/issues/1570)

Nos/Controller/FeedController.swift

@@ -4,7 +4,7 @@ import Dependencies
 import SwiftUI
 
 /// The source to be used for a feed of notes.
-enum FeedSource: Hashable, Equatable {
+enum FeedSource: RawRepresentable, Hashable, Equatable {
     case following
     case relay(String, String?)
     case list(String, String?)
@@ -31,6 +31,44 @@ enum FeedSource: Hashable, Equatable {
         default: false
         }
     }
+
+    // Note: RawRepresentable conformance is required for use of @AppStorage for persistence.
+    var rawValue: String {
+        switch self {
+        case .following:
+            "following"
+        case .relay(let host, let description):
+            "relay:|\(host):|\(description ?? "")"
+        case .list(let name, let description):
+            "list:|\(name):|\(description ?? "")"
+        }
+    }
+
+    init?(rawValue: String) {
+        let components = rawValue.split(separator: ":|").map { String($0) }
+        guard let caseName = components.first else {
+            return nil
+        }
+
+        switch caseName {
+        case "following":
+            self = .following
+        case "relay":
+            guard components.count >= 2 else {
+                return nil
+            }
+            let description = components.count >= 3 ? components[2] : ""
+            self = .relay(components[1], description)
+        case "list":
+            guard components.count >= 2 else {
+                return nil
+            }
+            let description = components.count >= 3 ? components[2] : ""
+            self = .list(components[1], description)
+        default:
+            return nil
+        }
+    }
 }
 
 @Observable @MainActor final class FeedController {
@@ -42,24 +80,13 @@ enum FeedSource: Hashable, Equatable {
 
     private(set) var selectedList: AuthorList?
     private(set) var selectedRelay: Relay?
-    var selectedSource: FeedSource = .following {
+
+    @ObservationIgnored @AppStorage("selectedFeedSource") private var persistedSelectedSource = FeedSource.following
+
+    var selectedSource = FeedSource.following {
         didSet {
-            switch selectedSource {
-            case .relay(let address, _):
-                if let relay = relays.first(where: { $0.host == address }) {
-                    selectedRelay = relay
-                    selectedList = nil
-                }
-            case .list(let title, _):
-                // TODO: Needs to use replaceableID instead of title
-                if let list = lists.first(where: { $0.title == title }) {
-                    selectedList = list
-                    selectedRelay = nil
-                }
-            default:
-                selectedList = nil
-                selectedRelay = nil
-            }
+            updateSelectedListOrRelay()
+            persistedSelectedSource = selectedSource
         }
     }
 
@@ -82,6 +109,12 @@ enum FeedSource: Hashable, Equatable {
     init() {
         observeLists()
         observeRelays()
+
+        // The delay here is an unfortunate workaround. Without it, the feed always resumes to
+        // the default value of FeedSource.following.
+        DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(500)) {
+            self.selectedSource = self.persistedSelectedSource
+        }
     }
 
     private func observeLists() {
@@ -136,6 +169,25 @@ enum FeedSource: Hashable, Equatable {
             .store(in: &cancellables)
     }
 
+    private func updateSelectedListOrRelay() {
+        switch selectedSource {
+        case .relay(let address, _):
+            if let relay = relays.first(where: { $0.host == address }) {
+                selectedRelay = relay
+                selectedList = nil
+            }
+        case .list(let title, _):
+            // TODO: Needs to use replaceableID instead of title
+            if let list = lists.first(where: { $0.title == title }) {
+                selectedList = list
+                selectedRelay = nil
+            }
+        default:
+            selectedList = nil
+            selectedRelay = nil
+        }
+    }
+
     private func updateEnabledSources() {
         var enabledSources = [FeedSource]()
         enabledSources.append(.following)

Nos/Models/CoreData/Event+Fetching.swift

@@ -392,11 +392,12 @@ extension Event {
     @nonobjc public class func homeFeed(
         for user: Author,
         after: Date,
-        seenOn relay: Relay? = nil
+        seenOn relay: Relay? = nil,
+        from authors: Set<Author>? = nil
     ) -> NSFetchRequest<Event> {
         let fetchRequest = NSFetchRequest<Event>(entityName: "Event")
         fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \Event.createdAt, ascending: false)]
-        fetchRequest.predicate = homeFeedPredicate(for: user, after: after, seenOn: relay)
+        fetchRequest.predicate = homeFeedPredicate(for: user, after: after, seenOn: relay, from: authors)
         return fetchRequest
     }
 

Nos/Views/Home/FeedPicker.swift

@@ -7,28 +7,35 @@ struct FeedPicker: View {
 
     var body: some View {
         BeveledContainerView {
-            ScrollView(.horizontal, showsIndicators: false) {
-                HStack(spacing: 0) {
-                    ForEach(feedController.enabledSources, id: \.self) { source in
-                        Button(action: {
-                            withAnimation(nil) {
-                                feedController.selectedSource = source
-                            }
-                        }, label: {
-                            let isSelected = feedController.selectedSource == source
-                            Text(source.displayName)
-                                .font(.system(size: 16, weight: isSelected ? .medium : .regular))
-                                .padding(.horizontal, 10)
-                                .padding(.vertical, 4)
-                                .background(isSelected ? Color.pickerBackgroundSelected : Color.clear)
-                                .foregroundStyle(isSelected ? Color.white : Color.secondaryTxt)
-                                .clipShape(Capsule())
-                        })
+            ScrollViewReader { proxy in
+                ScrollView(.horizontal, showsIndicators: false) {
+                    HStack(spacing: 0) {
+                        ForEach(feedController.enabledSources, id: \.self) { source in
+                            Button(action: {
+                                withAnimation(nil) {
+                                    feedController.selectedSource = source
+                                }
+                            }, label: {
+                                let isSelected = feedController.selectedSource == source
+                                Text(source.displayName)
+                                    .font(.system(size: 16, weight: isSelected ? .medium : .regular))
+                                    .padding(.horizontal, 10)
+                                    .padding(.vertical, 4)
+                                    .background(isSelected ? Color.pickerBackgroundSelected : Color.clear)
+                                    .foregroundStyle(isSelected ? Color.white : Color.secondaryTxt)
+                                    .clipShape(Capsule())
+                            })
+                        }
+                    }
+                    .padding(.horizontal, 8)
+                    .onChange(of: feedController.selectedSource) {
+                        withAnimation {
+                            proxy.scrollTo(feedController.selectedSource)
+                        }
                     }
                 }
-                .padding(.horizontal, 8)
+                .frame(height: 40)
             }
-            .frame(height: 40)
         }
         .background(Color.cardBgTop)
     }

Nos/Views/Home/HomeFeedView.swift

@@ -48,7 +48,8 @@ struct HomeFeedView: View {
         Event.homeFeed(
             for: user,
             after: refreshController.lastRefreshDate,
-            seenOn: feedController.selectedRelay
+            seenOn: feedController.selectedRelay,
+            from: feedController.selectedList?.allAuthors
         )
     }