feat: 视频列表本地缓存机制，搜索/重置/换页不再调用 API，避免间歇性签名错误

apps/macos/VODManager/Sources/VODManager/Views/VideoListView.swift

@@ -1,48 +1,63 @@
 import SwiftUI
 
 struct VideoListView: View {
-    @State private var videos: [VideoItem] = []
+    @State private var allVideos: [VideoItem] = []
+    @State private var filteredVideos: [VideoItem] = []
+    @State private var displayVideos: [VideoItem] = []
     @State private var selectedVideos: Set<String> = []
     @State private var keyword: String = ""
     @State private var isLoading = false
-    @State private var total = 0
+    @State private var loadingStatus = ""
-    @State private var pageNo = 1
-    @State private var pageSize = 10
     @State private var errorMessage: String?
     @State private var showDownloadPanel = false
     @State private var downloadResults: [(video: VideoItem, playInfos: [PlayInfo])] = []
 
+    private let pageSizes = [20, 50, 100]
+    @State private var pageSizeIndex = 0
+    private var pageSize: Int { pageSizes[pageSizeIndex] }
+    @State private var pageNo = 1
+    private var totalPages: Int { max(1, (filteredVideos.count + pageSize - 1) / pageSize) }
+
     var body: some View {
         VStack(spacing: 0) {
             HStack(spacing: 12) {
-                TextField("搜索标题 / 视频 ID", text: $keyword)
+                TextField("搜索本地缓存标题", text: $keyword)
                     .textFieldStyle(.roundedBorder)
                     .frame(minWidth: 200)
+                    .onChange(of: keyword) { _, _ in
+                        applyFilter()
+                    }
 
                 Button("搜索") {
-                    pageNo = 1
+                    applyFilter()
-                    Task { await fetch() }
                 }
                 .keyboardShortcut(.return, modifiers: [.command])
 
                 Button("重置") {
                     keyword = ""
-                    pageNo = 1
+                    applyFilter()
-                    Task { await fetch() }
                 }
 
                 Spacer()
 
+                Button {
+                    Task { await refreshFromAPI() }
+                } label: {
+                    Image(systemName: "arrow.clockwise")
+                }
+                .disabled(isLoading)
+                .help("从服务器刷新")
+
                 Button("批量下载") {
                     Task { await prepareDownload() }
                 }
                 .disabled(selectedVideos.isEmpty || isLoading)
 
                 Button("全选") {
-                    if selectedVideos.count == videos.count {
+                    if selectedVideos.count == displayVideos.count {
                         selectedVideos.removeAll()
                     } else {
-                        selectedVideos = Set(videos.map(\.videoId))
+                        selectedVideos = Set(displayVideos.map(\.videoId))
                     }
                 }
 
@@ -72,6 +87,18 @@ struct VideoListView: View {
                 .padding(.horizontal)
             }
 
+            if isLoading && !loadingStatus.isEmpty {
+                HStack(spacing: 8) {
+                    ProgressView()
+                        .controlSize(.small)
+                    Text(loadingStatus)
+                        .foregroundStyle(.secondary)
+                    Spacer()
+                }
+                .padding(.horizontal)
+                .padding(.vertical, 6)
+            }
+
             Table(of: VideoItem.self, selection: $selectedVideos) {
                 TableColumn("") { video in
                     Image(systemName: selectedVideos.contains(video.videoId) ? "checkmark.circle.fill" : "circle")
@@ -129,51 +156,103 @@ struct VideoListView: View {
                 }
                 .width(min: 120, ideal: 160)
             } rows: {
-                ForEach(videos) { video in
+                ForEach(displayVideos) { video in
                     TableRow(video)
                 }
             }
             .frame(minHeight: 300)
 
             HStack {
-                Text("共 \(total) 条，已选 \(selectedVideos.count) 个")
+                Text("共 \(filteredVideos.count) 条，已选 \(selectedVideos.count) 个")
                     .foregroundStyle(.secondary)
                 Spacer()
+
+                Picker("每页", selection: $pageSizeIndex) {
+                    ForEach(0..<pageSizes.count, id: \.self) { i in
+                        Text("\(pageSizes[i])").tag(i)
+                    }
+                }
+                .frame(width: 80)
+                .onChange(of: pageSizeIndex) { _, _ in
+                    pageNo = 1
+                    updateDisplay()
+                }
+
                 Button("上一页") {
                     pageNo -= 1
-                    Task { await fetch() }
+                    updateDisplay()
                 }
                 .disabled(pageNo <= 1)
-                Text("第 \(pageNo) 页")
+                Text("第 \(pageNo)/\(totalPages) 页")
                 Button("下一页") {
                     pageNo += 1
-                    Task { await fetch() }
+                    updateDisplay()
                 }
-                .disabled(pageNo * pageSize >= total)
+                .disabled(pageNo >= totalPages)
             }
             .padding()
         }
         .task {
-            await fetch()
+            if allVideos.isEmpty {
+                await refreshFromAPI()
+            }
         }
         .sheet(isPresented: $showDownloadPanel) {
             DownloadPanelView(items: downloadResults)
         }
     }
 
-    private func fetch() async {
+    private func applyFilter() {
+        let kw = keyword.trimmingCharacters(in: .whitespaces)
+        if kw.isEmpty {
+            filteredVideos = allVideos
+        } else {
+            filteredVideos = allVideos.filter {
+                $0.title.localizedCaseInsensitiveContains(kw) ||
+                $0.videoId.localizedCaseInsensitiveContains(kw)
+            }
+        }
+        pageNo = 1
+        selectedVideos.removeAll()
+        updateDisplay()
+    }
+
+    private func updateDisplay() {
+        let start = (pageNo - 1) * pageSize
+        let end = min(start + pageSize, filteredVideos.count)
+        if start < filteredVideos.count {
+            displayVideos = Array(filteredVideos[start..<end])
+        } else {
+            displayVideos = []
+        }
+    }
+
+    private func refreshFromAPI() async {
         isLoading = true
         errorMessage = nil
+        loadingStatus = "正在加载视频列表..."
+        var collected: [VideoItem] = []
+        var page = 1
+        let size = 100
+        var total = 0
         do {
+            while true {
+                loadingStatus = "正在加载视频列表... (第 \(page) 页)"
                 let response = try await VODClient.shared.searchMedia(
-                keyword: keyword.isEmpty ? nil : keyword,
+                    pageNo: page,
-                pageNo: pageNo,
+                    pageSize: size
-                pageSize: pageSize
                 )
-            videos = response.videos
+                let videos = response.videos
+                collected.append(contentsOf: videos)
                 total = response.Total ?? 0
-            pageNo = response.PageNo ?? pageNo
+                if collected.count >= total || videos.isEmpty {
-            pageSize = response.PageSize ?? pageSize
+                    break
+                }
+                page += 1
+            }
+            allVideos = collected
+            applyFilter()
+            loadingStatus = ""
         } catch {
             errorMessage = "加载失败：\(error.localizedDescription)"
         }
@@ -185,7 +264,8 @@ struct VideoListView: View {
         do {
             try await VODClient.shared.deleteVideos(videoIds: ids)
             selectedVideos.removeAll()
-            await fetch()
+            allVideos.removeAll { ids.contains($0.videoId) }
+            applyFilter()
         } catch {
             errorMessage = "删除失败：\(error.localizedDescription)"
         }
@@ -194,20 +274,19 @@ struct VideoListView: View {
     private func prepareDownload() async {
         isLoading = true
         errorMessage = nil
+        loadingStatus = ""
         var results: [(video: VideoItem, playInfos: [PlayInfo])] = []
         var errors: [String] = []
-        for video in videos where selectedVideos.contains(video.videoId) {
+        let selected = displayVideos.filter { selectedVideos.contains($0.videoId) }
-            do {
+        for (index, video) in selected.enumerated() {
-                let response = try await VODClient.shared.getPlayInfo(videoId: video.videoId)
+            loadingStatus = "正在获取下载地址 (\(index + 1)/\(selected.count))「\(video.title)」..."
-                results.append((video, response.playInfos))
+            let playInfos = await fetchPlayInfoWithRetry(videoId: video.videoId, title: video.title, maxRetries: 3)
-                if response.playInfos.isEmpty {
+            results.append((video, playInfos))
+            if playInfos.isEmpty {
                 errors.append("「\(video.title)」无可用播放地址")
             }
-            } catch {
-                results.append((video, []))
-                errors.append("「\(video.title)」获取播放信息失败：\(error.localizedDescription)")
-            }
         }
+        loadingStatus = ""
         if !errors.isEmpty {
             errorMessage = errors.joined(separator: "\n")
         }
@@ -216,6 +295,29 @@ struct VideoListView: View {
         isLoading = false
     }
 
+    private func fetchPlayInfoWithRetry(videoId: String, title: String, maxRetries: Int) async -> [PlayInfo] {
+        for attempt in 1...maxRetries {
+            do {
+                let response = try await VODClient.shared.getPlayInfo(videoId: videoId)
+                if !response.playInfos.isEmpty {
+                    return response.playInfos
+                }
+                if attempt < maxRetries {
+                    print("[Download]「\(title)」第 \(attempt) 次获取到空播放地址，\(attempt)s 后重试...")
+                    try? await Task.sleep(for: .seconds(attempt))
+                }
+            } catch {
+                if attempt < maxRetries {
+                    print("[Download]「\(title)」第 \(attempt) 次获取失败: \(error)，\(attempt)s 后重试...")
+                    try? await Task.sleep(for: .seconds(attempt))
+                } else {
+                    print("[Download]「\(title)」\(maxRetries) 次尝试均失败: \(error)")
+                }
+            }
+        }
+        return []
+    }
+
     private func formatDuration(_ seconds: Double?) -> String {
         guard let seconds = seconds else { return "-" }
         let m = Int(seconds) / 60