fix(iOS): copy SMB files to local Documents before playing — AVPlayer can't handle smb:// URLs

Sources/NetworkFileBrowser.swift

@@ -264,6 +264,8 @@ struct NetworkFileBrowserIOS: View {
     @State private var isLoading = false
     @State private var streamURL = ""
     @State private var showFileImporter = false
+    @State private var copyingFile = false
+    @State private var copyProgress = ""
     
     var body: some View {
         NavigationView {
@@ -272,6 +274,15 @@ struct NetworkFileBrowserIOS: View {
             }
             .navigationTitle(browseURL != nil ? "Browsing" : "Network Files")
             .navigationBarTitleDisplayMode(.inline)
+            .overlay {
+                if copyingFile {
+                    Color.black.opacity(0.6).ignoresSafeArea()
+                    VStack(spacing: 12) {
+                        ProgressView()
+                        Text(copyProgress).foregroundColor(.white)
+                    }
+                }
+            }
             .toolbar {
                 if browseURL != nil {
                     ToolbarItem(placement: .navigationBarLeading) {
@@ -418,7 +429,59 @@ struct NetworkFileBrowserIOS: View {
     
     private func handleSelect(_ item: NetworkFileItem) {
         if item.isDirectory { if let cur = browseURL { pathStack.append(cur) }; navigateTo(item.url) }
-        else if item.isMediaFile { bridge.addItem(url: item.url, name: item.name, type: "network"); if item.hasMatchingASS { bridge.loadExternalSubtitle(url: item.url.deletingPathExtension().appendingPathExtension("ass")) }; isPresented = false }
+        else if item.isMediaFile {
+            // SMB 文件需要复制到本地，AVPlayer 不认 smb:// 协议
+            if item.url.scheme == "smb" {
+                copyFromSMBAndPlay(item)
+            } else {
+                playMedia(item)
+            }
+        }
+    }
+    
+    private func playMedia(_ item: NetworkFileItem) {
+        bridge.addItem(url: item.url, name: item.name, type: "network")
+        if item.hasMatchingASS { bridge.loadExternalSubtitle(url: item.url.deletingPathExtension().appendingPathExtension("ass")) }
+        isPresented = false
+    }
+    
+    private func copyFromSMBAndPlay(_ item: NetworkFileItem) {
+        copyingFile = true
+        copyProgress = "Copying \(item.name)..."
+        
+        DispatchQueue.global(qos: .userInitiated).async {
+            let docs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
+            let localURL = docs.appendingPathComponent(item.name)
+            
+            // 删除旧副本
+            try? FileManager.default.removeItem(at: localURL)
+            
+            do {
+                try FileManager.default.copyItem(at: item.url, to: localURL)
+                
+                // 同时复制同名 ASS
+                var assLocal: URL?
+                if item.hasMatchingASS {
+                    let assURL = item.url.deletingPathExtension().appendingPathExtension("ass")
+                    let assDest = docs.appendingPathComponent(assURL.lastPathComponent)
+                    if (try? FileManager.default.copyItem(at: assURL, to: assDest)) != nil {
+                        assLocal = assDest
+                    }
+                }
+                
+                DispatchQueue.main.async {
+                    self.copyingFile = false
+                    bridge.addItem(url: localURL, name: item.name, type: "network")
+                    if let al = assLocal { bridge.loadExternalSubtitle(url: al) }
+                    isPresented = false
+                }
+            } catch {
+                DispatchQueue.main.async {
+                    self.copyingFile = false
+                    self.connectError = "Copy failed: \(error.localizedDescription)"
+                }
+            }
+        }
     }
     
     private func fmtSize(_ s: Int64) -> String {