[iOS] correct mistral q3 url and handle screen switch off (#2529)

This PR corrects the mistral q3 url

This PR also add a handler for screen switch off.
For now we just reset if the app is generating,
we will update to pause/resume once they are supported.

Author: tqchen

ios/MLCChat/MLCChat.xcodeproj/project.pbxproj

@@ -415,6 +415,7 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				IPHONEOS_DEPLOYMENT_TARGET = 17.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -467,6 +468,7 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				IPHONEOS_DEPLOYMENT_TARGET = 17.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",

ios/MLCChat/MLCChat/States/ChatState.swift

@@ -87,6 +87,15 @@ final class ChatState: ObservableObject {
         })
     }
 
+    // reset the chat if we switch to background
+    // during generation to avoid permission issue
+    func requestSwitchToBackground() {
+        if (getModelChatState() == .generating) {
+            self.requestResetChat()
+        }
+    }
+
+
     func requestTerminateChat(callback: @escaping () -> Void) {
         assert(isInterruptible)
         interruptChat(prologue: {

ios/MLCChat/MLCChat/Views/ChatView.swift

@@ -8,7 +8,7 @@ import GameController
 
 struct ChatView: View {
     @EnvironmentObject private var chatState: ChatState
-
+    @Environment(\.scenePhase) var scenePhase
     @State private var inputMessage: String = ""
     @FocusState private var inputIsFocused: Bool
     @Environment(\.dismiss) private var dismiss
@@ -20,7 +20,7 @@ struct ChatView: View {
     @State private var imageConfirmed: Bool = false
     @State private var imageSourceType: UIImagePickerController.SourceType = .photoLibrary
     @State private var image: UIImage?
-    
+
     var body: some View {
         VStack {
             modelInfoView
@@ -30,6 +30,11 @@ struct ChatView: View {
         }
         .navigationBarTitle("MLC Chat: \(chatState.displayName)", displayMode: .inline)
         .navigationBarBackButtonHidden()
+        .onChange(of: scenePhase) { oldPhase, newPhase in
+            if newPhase == .background {
+                self.chatState.requestSwitchToBackground()
+            }
+        }
         .toolbar {
             ToolbarItem(placement: .navigationBarLeading) {
                 Button {
@@ -50,6 +55,7 @@ struct ChatView: View {
                 .disabled(!chatState.isResettable)
             }
         }
+
     }
 }
 

ios/MLCChat/mlc-package-config.json

@@ -28,11 +28,12 @@
             }
         },
         {
-            "model": "HF://mlc-ai/Mistral-7B-Instruct-v0.3-q4f16_1-MLC",
+            "model": "HF://mlc-ai/Mistral-7B-Instruct-v0.3-q3f16_1-MLC",
             "model_id": "Mistral-7B-Instruct-v0.3-q3f16_1-MLC",
             "estimated_vram_bytes": 3316000000,
             "overrides": {
-                "prefill_chunk_size": 128
+                "prefill_chunk_size": 128,
+                "context_window_size": 768
             }
         }
     ]