[update] change storage key from modelId to modelName

apps/iOS/MNNLLMChat/MNNLLMiOS/MainTab/LocalModelList/Views/LocalModelListView.swift

@@ -35,4 +35,4 @@ struct LocalModelListView: View {
             Text(viewModel.errorMessage)
         }
     }
-} 
+}

apps/iOS/MNNLLMChat/MNNLLMiOS/MainTab/MainTabView.swift

@@ -15,7 +15,7 @@ struct MainTabView: View {
     @State private var showSettings = false
     @State private var showWebView = false
     @State private var webViewURL: URL?
-    @State private var navigateToSettings = false  // 新增状态变量
+    @State private var navigateToSettings = false
     @StateObject private var modelListViewModel = TBModelListViewModel()
     @StateObject private var localModelListViewModel = ModelListViewModel()
     @State private var selectedTab: Int = 0
@@ -132,6 +132,9 @@ struct MainTabView: View {
     private var chatDestination: some View {
         if let model = localModelListViewModel.selectedModel {
             LLMChatView(modelInfo: model)
+                .navigationBarHidden(false)
+                .navigationBarTitleDisplayMode(.inline)
+                .toolbar(.hidden, for: .tabBar) // Hide tab bar in chat
         } else if let history = selectedHistory {
             let modelInfo = ModelInfo(
                 modelId: history.modelId,
@@ -141,6 +144,9 @@ struct MainTabView: View {
                 isDownloaded: true
             )
             LLMChatView(modelInfo: modelInfo, history: history)
+                .navigationBarHidden(false)
+                .navigationBarTitleDisplayMode(.inline)
+                .toolbar(.hidden, for: .tabBar) // Hide tab bar in chat
         } else {
             EmptyView()
         }
@@ -148,13 +154,18 @@ struct MainTabView: View {
     
     private var chatIsActiveBinding: Binding<Bool> {
         Binding<Bool>(
-            get: { modelListViewModel.selectedModel != nil || selectedHistory != nil },
+            get: { 
+                return localModelListViewModel.selectedModel != nil || selectedHistory != nil
+            },
             set: { isActive in
                 if !isActive {
+                    // Record usage when returning from chat
                     if let model = localModelListViewModel.selectedModel {
-                        modelListViewModel.recordModelUsage(modelId: model.modelId)
+                        localModelListViewModel.recordModelUsage(modelName: model.name)
                     }
-                    modelListViewModel.selectedModel = nil
+                    
+                    // Clear selections
+                    localModelListViewModel.selectedModel = nil
                     selectedHistory = nil
                 }
             }
@@ -184,4 +195,4 @@ struct MainTabView: View {
         UITabBar.appearance().standardAppearance = appearance
         UITabBar.appearance().scrollEdgeAppearance = appearance
     }
-}
+}

apps/iOS/MNNLLMChat/MNNLLMiOS/MainTab/ModelList/Models/ModelStorageManager.swift

@@ -25,14 +25,14 @@ class ModelStorageManager {
         }
     }
     
-    func updateLastUsed(for modelId: String) {
+    func updateLastUsed(for modelName: String) {
         var models = lastUsedModels
-        models[modelId] = Date()
+        models[modelName] = Date()
         lastUsedModels = models
     }
     
-    func getLastUsed(for modelId: String) -> Date? {
-        return lastUsedModels[modelId]
+    func getLastUsed(for modelName: String) -> Date? {
+        return lastUsedModels[modelName]
     }
     
     var downloadedModels: [String] {
@@ -44,21 +44,21 @@ class ModelStorageManager {
         }
     }
     
-    func clearDownloadStatus(for modelId: String) {
+    func clearDownloadStatus(for modelName: String) {
         var models = downloadedModels
-        models.removeAll { $0 == modelId }
+        models.removeAll { $0 == modelName }
         downloadedModels = models
     }
     
-    func isModelDownloaded(_ modelId: String) -> Bool {
-        downloadedModels.contains(modelId)
+    func isModelDownloaded(_ modelName: String) -> Bool {
+        downloadedModels.contains(modelName)
     }
     
-    func markModelAsDownloaded(_ modelId: String) {
+    func markModelAsDownloaded(_ modelName: String) {
         var models = downloadedModels
-        if !models.contains(modelId) {
-            models.append(modelId)
+        if !models.contains(modelName) {
+            models.append(modelName)
             downloadedModels = models
         }
     }
-}
+}

apps/iOS/MNNLLMChat/MNNLLMiOS/MainTab/ModelList/Models/TBModelListViewModel.swift

@@ -293,4 +293,4 @@ class TBModelListViewModel: ObservableObject {
             }
         }
     }
-}
+}

apps/iOS/MNNLLMChat/MNNLLMiOS/MainTab/ModelList/Views/TBModelListView.swift

@@ -144,4 +144,4 @@ struct TBModelListView: View {
             model.vendor?.localizedCaseInsensitiveContains(selectedVendor) ?? false
         }
     }
-}
+}