修复四个问题: 录制后弹保存窗/本地文件播放/左上角锁定/音轨循环切换

1. HLSRecorder: 添加 pendingExportURL，录制完成后通过 SwiftUI sheet 弹出分享面板
2. PlayerBridge: AVAudioSession mode 改为 .default 兼容视频+音频，本地文件加载失败增强日志
3. PlayerContentView: iOS 锁屏功能，30秒无操作自动锁定，左上角图标切换锁状态
4. ControlToolbar: 音轨按钮改为直接循环切换（仅多音轨时可用），添加 cycleTrack() 方法

Sources/HLSRecorder.swift

@@ -10,6 +10,7 @@ import Photos
 final class HLSRecorder: ObservableObject {
     @Published var isRecording = false
     @Published var durationText = "00:00"
+    @Published var pendingExportURL: URL?
     
     var onRecordingSaved: ((URL) -> Void)?
     var onError: ((String) -> Void)?
@@ -303,9 +304,9 @@ final class HLSRecorder: ObservableObject {
             saveToPhotoLibrary(url: url)
         }
         
-        // 2. 延迟弹出系统分享面板（等相册保存启动后再弹）
+        // 2. 通过 SwiftUI sheet 弹出分享面板（而非直接 present UIViewController）
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
+        DispatchQueue.main.async { [weak self] in
-            self?.presentActivitySheet(url: url)
+            self?.pendingExportURL = url
         }
     }
     

Sources/MiniPlayerApp.swift

@@ -360,6 +360,11 @@ struct PlayerContentView: View {
     @State private var isHoveringIcon = false
     @State private var hideTimer: Timer?
     @State private var isHoveringToolbar = false
+    #if os(iOS)
+    @State private var isLocked = false
+    @State private var lastInteraction = Date()
+    @State private var lockCheckTimer: Timer?
+    #endif
     
     private func resetHideTimer() {
         hideTimer?.invalidate()
@@ -371,6 +376,17 @@ struct PlayerContentView: View {
         }
     }
     
+    #if os(iOS)
+    private func recordInteraction() {
+        lastInteraction = Date()
+        if isLocked {
+            // 有交互时不解锁，等待用户点击图标解锁
+            // 仅重置交互时间推迟自动锁定
+        }
+        resetHideTimer()
+    }
+    #endif
+    
     var body: some View {
         ZStack(alignment: .topLeading) {
             Color.black.ignoresSafeArea()
@@ -383,9 +399,15 @@ struct PlayerContentView: View {
             }
                 .frame(maxWidth: .infinity, maxHeight: .infinity)
                 .onTapGesture(count: 2) {
+                    #if os(iOS)
+                    recordInteraction()
+                    #endif
                     bridge.toggleFullscreen()
                 }
                 .onTapGesture {
+                    #if os(iOS)
+                    recordInteraction()
+                    #endif
                     bridge.togglePlayPause()
                 }
                 #if os(macOS)
@@ -415,7 +437,7 @@ struct PlayerContentView: View {
             // 播放状态指示（loading/buffering/error）
             PlayerStatusOverlay(bridge: bridge)
             
-            // 左上角应用图标 — 点击切换控制栏
+            // 左上角应用图标 — iOS 锁屏控制 / macOS 切换控制栏
             MiniPlayerIcon()
                 .frame(width: 32, height: 32)
                 .padding(12)
@@ -428,10 +450,19 @@ struct PlayerContentView: View {
                 .contentShape(Rectangle())
                 .highPriorityGesture(
                     TapGesture().onEnded {
+                        #if os(iOS)
+                        lastInteraction = Date()
+                        if isLocked {
+                            isLocked = false
+                        } else {
+                            isLocked = true
+                        }
+                        #else
                         withAnimation(.easeInOut(duration: 0.25)) {
                             showToolbar.toggle()
                         }
                         resetHideTimer()
+                        #endif
                     }
                 )
             
@@ -440,7 +471,11 @@ struct PlayerContentView: View {
                 Spacer()
                 if showToolbar {
                     ControlToolbar(bridge: bridge, isHovering: $isHoveringToolbar) {
+                        #if os(iOS)
+                        recordInteraction()
+                        #else
                         resetHideTimer()
+                        #endif
                     }
                     .background(
                         RoundedRectangle(cornerRadius: 12)
@@ -454,6 +489,19 @@ struct PlayerContentView: View {
                     .transition(.move(edge: .bottom).combined(with: .opacity))
                 }
             }
+            
+            // iOS 锁屏遮罩层（拦截触摸，仅左上角图标可点击解锁）
+            #if os(iOS)
+            if isLocked {
+                Color.black.opacity(0.01)
+                    .ignoresSafeArea()
+                    .allowsHitTesting(true)
+                    .contentShape(Rectangle())
+                    .onTapGesture {
+                        // 吞掉所有触摸
+                    }
+            }
+            #endif
         }
         .onAppear {
             #if os(macOS)
@@ -474,6 +522,17 @@ struct PlayerContentView: View {
                 WindowMouseMonitor.shared.startMonitoring()
             }
             #endif
+            
+            #if os(iOS)
+            // 锁屏自动检测定时器（每5秒检查，超过30秒无交互则锁定）
+            lockCheckTimer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: true) { _ in
+                DispatchQueue.main.async {
+                    if !isLocked && Date().timeIntervalSince(lastInteraction) > 30 {
+                        isLocked = true
+                    }
+                }
+            }
+            #endif
         }
         .onChange(of: showToolbar) { _, newValue in
             if newValue {
@@ -484,6 +543,10 @@ struct PlayerContentView: View {
         }
         .onDisappear {
             hideTimer?.invalidate()
+            #if os(iOS)
+            lockCheckTimer?.invalidate()
+            lockCheckTimer = nil
+            #endif
         }
     }
 }
@@ -520,6 +583,11 @@ struct BricksAppView: View {
                     bridge.showToastMsg(error.localizedDescription)
                 }
             }
+            .sheet(item: $bridge.hlsRecorder.pendingExportURL) { url in
+                ActivityShareSheet(url: url) {
+                    bridge.hlsRecorder.pendingExportURL = nil
+                }
+            }
             #endif
     }
 }
@@ -625,7 +693,27 @@ struct ControlToolbar: View {
                 Divider().frame(height: 20).padding(.horizontal, 4)
                 
                 // 音轨
-                TB(icon: "music.note") { bridge.showTrackDialog = true; onTouch() }
+                if bridge.availableTracks.count <= 1 {
+                    Button(action: {}) {
+                        Text("🎵")
+                            .font(.system(size: 14))
+                            .foregroundColor(.gray.opacity(0.4))
+                            .frame(width: 28, height: 28)
+                    }
+                    .buttonStyle(.plain)
+                    .disabled(true)
+                } else {
+                    Button(action: { bridge.cycleTrack(); onTouch() }) {
+                        Text(bridge.currentTrackLabel)
+                            .font(.system(size: 11, design: .monospaced))
+                            .foregroundColor(.white)
+                            .frame(minWidth: 50, height: 28)
+                            .padding(.horizontal, 4)
+                            .background(Color.white.opacity(0.15))
+                            .cornerRadius(4)
+                    }
+                    .buttonStyle(.plain)
+                }
                 
                 // 循环
                 TB(icon: repeatIcon()) { bridge.cycleRepeatMode(); onTouch() }
@@ -918,3 +1006,26 @@ struct PlayerStatusOverlay: View {
         .background(Color.black.opacity(0.6))
     }
 }
+
+#if os(iOS)
+// MARK: - URL Identifiable 扩展（用于 .sheet(item:)）
+extension URL: @retroactive Identifiable {
+    public var id: String { absoluteString }
+}
+
+// MARK: - 系统分享面板（UIViewControllerRepresentable 包装）
+struct ActivityShareSheet: UIViewControllerRepresentable {
+    let url: URL
+    let onDismiss: () -> Void
+    
+    func makeUIViewController(context: Context) -> UIActivityViewController {
+        let vc = UIActivityViewController(activityItems: [url], applicationActivities: nil)
+        vc.completionWithItemsHandler = { _, _, _, _ in
+            onDismiss()
+        }
+        return vc
+    }
+    
+    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {}
+}
+#endif

Sources/PlayerBridge.swift

@@ -166,9 +166,9 @@ final class PlayerBridge: ObservableObject {
     private func configureAudioSession() {
         do {
             let session = AVAudioSession.sharedInstance()
-            try session.setCategory(.playback, mode: .moviePlayback)
+            try session.setCategory(.playback, mode: .default)
             try session.setActive(true)
-            NSLog("[MiniPlayer] AVAudioSession configured: playback + moviePlayback")
+            NSLog("[MiniPlayer] AVAudioSession configured: playback + default")
         } catch {
             NSLog("[MiniPlayer] AVAudioSession setup failed: \(error.localizedDescription)")
         }
@@ -311,7 +311,13 @@ final class PlayerBridge: ObservableObject {
                         }
                     }
                 case .failed:
-                    let errMsg = pi.error?.localizedDescription ?? "Unknown error"
+                    let err = pi.error
+                    let errMsg = err?.localizedDescription ?? "Unknown error"
+                    let errCode = (err as NSError?)?.code ?? 0
+                    let isLocalFile = item.url.isFileURL
+                    NSLog("[MiniPlayer] ❌ AVPlayerItem failed: error=%@, code=%d, domain=%@, localFile=%d, url=%@",
+                          errMsg, errCode, (err as NSError?)?.domain ?? "none", isLocalFile ? 1 : 0,
+                          item.url.absoluteString)
                     self?.playerStatus = .error(errMsg)
                     self?.loadingTimer?.invalidate()
                     self?.loadingTimer = nil
@@ -455,6 +461,12 @@ final class PlayerBridge: ObservableObject {
         }
     }
     
+    func cycleTrack() {
+        guard availableTracks.count > 1 else { return }
+        let nextIndex = (currentTrackIndex + 1) % availableTracks.count
+        selectTrack(index: nextIndex)
+    }
+    
     private func updateTrackLabel() {
         currentTrackLabel = "🎵 \(L.track) \(currentTrackIndex + 1)/\(max(availableTracks.count, 1))"
     }