feat: 实现动态内容的分页加载与刷新功能

- 在FeedListFeature中新增分页相关状态管理，支持上拉加载更多和下拉刷新功能，提升用户体验。
- 在FeedListView中实现上拉加载更多的触发逻辑和加载指示器，优化动态内容展示。

yana/Features/FeedListFeature.swift

@@ -13,12 +13,17 @@ struct FeedListFeature {
         var moments: [MomentsInfo] = []
         // 新增：只加载一次标志
         var isLoaded: Bool = false
+        // 分页相关
+        var currentPage: Int = 1
+        var hasMore: Bool = true
+        var isLoadingMore: Bool = false
     }
     
     enum Action: Equatable {
         case onAppear
         case reload
         case loadMore
+        case loadMoreResponse(TaskResult<MomentsLatestResponse>)
         case editFeedButtonTapped // 新增：点击 add 按钮
         case editFeedDismissed    // 新增：关闭编辑页
         // 新增：动态内容相关
@@ -34,6 +39,57 @@ struct FeedListFeature {
             guard !state.isLoaded else { return .none }
             state.isLoaded = true
             return .send(.fetchFeeds)
+        case .reload:
+            // 下拉刷新，重置状态并请求第一页
+            state.isLoading = true
+            state.error = nil
+            state.currentPage = 1
+            state.hasMore = true
+            state.isLoaded = true
+            return .run { [apiService] send in
+                await send(.fetchFeedsResponse(TaskResult {
+                    let request = LatestDynamicsRequest(dynamicId: "", pageSize: 20, types: [.text, .picture])
+                    return try await apiService.request(request)
+                }))
+            }
+        case .loadMore:
+            // 上拉加载更多
+            guard state.hasMore, !state.isLoadingMore, !state.isLoading else { return .none }
+            state.isLoadingMore = true
+            let lastDynamicId: String = {
+                if let last = state.moments.last {
+                    return String(last.dynamicId)
+                } else {
+                    return ""
+                }
+            }()
+            return .run { [apiService] send in
+                await send(.loadMoreResponse(TaskResult {
+                    let request = LatestDynamicsRequest(dynamicId: lastDynamicId, pageSize: 20, types: [.text, .picture])
+                    return try await apiService.request(request)
+                }))
+            }
+        case let .loadMoreResponse(.success(response)):
+            state.isLoadingMore = false
+            if let list = response.data?.dynamicList {
+                if list.isEmpty {
+                    state.hasMore = false
+                } else {
+                    state.moments.append(contentsOf: list)
+                    state.currentPage += 1
+                    state.hasMore = (list.count >= 20)
+                }
+                state.error = nil
+            } else {
+                state.hasMore = false
+                state.error = response.message
+            }
+            return .none
+        case let .loadMoreResponse(.failure(error)):
+            state.isLoadingMore = false
+            state.hasMore = false
+            state.error = error.localizedDescription
+            return .none
         case .fetchFeeds:
             state.isLoading = true
             state.error = nil
@@ -49,21 +105,19 @@ struct FeedListFeature {
             if let list = response.data?.dynamicList {
                 state.moments = list
                 state.error = nil
+                state.currentPage = 1
+                state.hasMore = (list.count >= 20)
             } else {
                 state.moments = []
                 state.error = response.message
+                state.hasMore = false
             }
             return .none
         case let .fetchFeedsResponse(.failure(error)):
             state.isLoading = false
             state.moments = []
             state.error = error.localizedDescription
-            return .none
-        case .reload:
-            // 预留刷新逻辑
-            return .none
-        case .loadMore:
-            // 预留分页加载逻辑
+            state.hasMore = false
             return .none
         case .editFeedButtonTapped:
             state.isEditFeedPresented = true

yana/Views/FeedListView.swift

@@ -69,12 +69,29 @@ struct FeedListView: View {
                                 LazyVStack(spacing: 16) {
                                     ForEach(Array(viewStore.moments.enumerated()), id: \ .element.dynamicId) { index, moment in
                                         OptimizedDynamicCardView(moment: moment, allMoments: viewStore.moments, currentIndex: index)
+                                        // 上拉加载更多触发点
+                                        if index == viewStore.moments.count - 1, viewStore.hasMore, !viewStore.isLoadingMore {
+                                            Color.clear
+                                                .frame(height: 1)
+                                                .onAppear {
+                                                    viewStore.send(.loadMore)
+                                                }
+                                        }
+                                    }
+                                    // 加载更多指示器
+                                    if viewStore.isLoadingMore {
+                                        ProgressView()
+                                            .progressViewStyle(CircularProgressViewStyle(tint: .white))
+                                            .padding(.vertical, 8)
                                     }
                                 }
                                 .padding(.horizontal, 16)
                                 .padding(.top, 10)
                                 .padding(.bottom, 20)
                             }
+                            .refreshable {
+                                viewStore.send(.reload)
+                            }
                         }
                         Spacer()
                     }