Update iOS LLM Application

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/ContentView.swift

@@ -3,11 +3,10 @@
 
 import SwiftUI
 
-
 struct Message: Identifiable {
-    let id = UUID()
-    var text: String
-    let isUser: Bool
+  let id = UUID()
+  var text: String
+  let isUser: Bool
 }
 
 struct ContentView: View {
@@ -18,140 +17,165 @@ struct ContentView: View {
     @State private var showAlert: Bool = false
     @State private var errorMessage: String = ""
 
-    private let generator = GenAIGenerator()
-
-    var body: some View {
-        VStack {
-            // ChatBubbles
-            ScrollView {
-                VStack(alignment: .leading, spacing: 20) {
-                    ForEach(messages) { message in
-                        ChatBubble(text: message.text, isUser: message.isUser)
-                            .padding(.horizontal, 20)
-                    }
-                    if !stats.isEmpty {
-                        Text(stats)
-                            .font(.footnote)
-                            .foregroundColor(.gray)
-                            .padding(.horizontal, 20)
-                            .padding(.top, 5)
-                            .multilineTextAlignment(.center)
-                    }
-                }
-                .padding(.top, 20)
-            }
+  private let generator = GenAIGenerator()
 
-
-            // User input 
-            HStack {
-                TextField("Type your message...", text: $userInput)
-                    .padding()
-                    .background(Color(.systemGray6))
-                    .cornerRadius(20)
-                    .padding(.horizontal)
-
-                Button(action: {
-                    // Check for non-empty input
-                    guard !userInput.trimmingCharacters(in: .whitespaces).isEmpty else { return }
-
-                    messages.append(Message(text: userInput, isUser: true))
-                    messages.append(Message(text: "", isUser: false))  // Placeholder for AI response
-
-
-                    // clear previously generated tokens
-                    SharedTokenUpdater.shared.clearTokens()
-
-                    let prompt = userInput
-                    userInput = ""
-                    isGenerating = true
-
-
-                    DispatchQueue.global(qos: .background).async {
-                        generator.generate(prompt)
-                    }
-                }) {
-                    Image(systemName: "paperplane.fill")
-                        .foregroundColor(.white)
-                        .padding()
-                        .background(isGenerating ? Color.gray : Color.pastelGreen)
-                        .clipShape(Circle())
-                        .padding(.trailing, 10)
-                }
-                .disabled(isGenerating)
-            }
-            .padding(.bottom, 20)
-        }
-        .background(Color(.systemGroupedBackground))
-        .edgesIgnoringSafeArea(.bottom)
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationCompleted"))) { _ in
-            isGenerating = false  // Re-enable the button when token generation is complete
+  var body: some View {
+    VStack {
+      // ChatBubbles
+      ScrollView {
+        VStack(alignment: .leading, spacing: 20) {
+          ForEach(messages) { message in
+            ChatBubble(text: message.text, isUser: message.isUser)
+              .padding(.horizontal, 20)
+          }
+          if !stats.isEmpty {
+            Text(stats)
+              .font(.footnote)
+              .foregroundColor(.gray)
+              .padding(.horizontal, 20)
+              .padding(.top, 5)
+              .multilineTextAlignment(.center)
+          }
         }
-        .onReceive(SharedTokenUpdater.shared.$decodedTokens) { tokens in
-            // update model response
-            if let lastIndex = messages.lastIndex(where: { !$0.isUser }) {
-                let combinedText = tokens.joined(separator: "")
-                messages[lastIndex].text = combinedText
-            }
-        }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationStats"))) { notification in
-            if let userInfo = notification.userInfo,
-               let promptProcRate = userInfo["promptProcRate"] as? Double,
-               let tokenGenRate = userInfo["tokenGenRate"] as? Double {
-                stats = String(format: "Token generation rate: %.2f tokens/s. Prompt processing rate: %.2f tokens/s", tokenGenRate, promptProcRate)
-            }
+        .padding(.top, 20)
+      }
+
+      HStack {
+        Button(action: {
+          showFolderPicker = true
+        }) {
+          HStack {
+            Image(systemName: "folder")
+              .resizable()
+              .scaledToFit()
+              .frame(width: 20, height: 20)
+          }
+          .padding()
+          .background(Color.pastelGreen)
+          .cornerRadius(10)
+          .shadow(radius: 2)
+          .padding(.leading, 10)
         }
-        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationError"))) { notification in
-            if let userInfo = notification.userInfo, let error = userInfo["error"] as? String {
-                    errorMessage = error
-                    isGenerating = false
-                    showAlert = true
+        .sheet(isPresented: $showFolderPicker) {
+          FolderPicker { folderURL in
+            if let folderURL = folderURL {
+              let folderPath = folderURL.path
+              print("Selected folder: \(folderPath)")
+              DispatchQueue.global(qos: .background).async {
+                generator.setModelFolderPath(folderPath)
+              }
             }
+          }
+        }.help("Select a folder to set the model path")
+
+        TextField("Type your message...", text: $userInput)
+          .padding()
+          .background(Color(.systemGray6))
+          .cornerRadius(20)
+          .padding(.horizontal)
+
+        Button(action: {
+          // Check for non-empty input
+          guard !userInput.trimmingCharacters(in: .whitespaces).isEmpty else { return }
+
+          messages.append(Message(text: userInput, isUser: true))
+          messages.append(Message(text: "", isUser: false))  // Placeholder for AI response
+
+          // clear previously generated tokens
+          SharedTokenUpdater.shared.clearTokens()
+
+          let prompt = userInput
+          userInput = ""
+          isGenerating = true
+
+          DispatchQueue.global(qos: .background).async {
+            generator.generate(prompt)
+          }
+        }) {
+          Image(systemName: "paperplane.fill")
+            .foregroundColor(.white)
+            .padding()
+            .background(isGenerating ? Color.gray : Color.pastelGreen)
+            .clipShape(Circle())
         }
-        .alert(isPresented: $showAlert) {
-            Alert(
-                title: Text("Error"),
-                message: Text(errorMessage),
-                dismissButton: .default(Text("OK"))
-            )
-        }
-
+        .disabled(isGenerating)
+      }
+      .padding(.bottom, 20)
+    }
+    .background(Color(.systemGroupedBackground))
+    .edgesIgnoringSafeArea(.bottom)
+    .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationCompleted"))) { _ in
+      isGenerating = false  // Re-enable the button when token generation is complete
+    }
+    .onReceive(SharedTokenUpdater.shared.$decodedTokens) { tokens in
+      // update model response
+      if let lastIndex = messages.lastIndex(where: { !$0.isUser }) {
+        let combinedText = tokens.joined(separator: "")
+        messages[lastIndex].text = combinedText
+      }
+    }
+    .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationStats"))) { notification in
+      if let userInfo = notification.userInfo,
+        let promptProcRate = userInfo["promptProcRate"] as? Double,
+        let tokenGenRate = userInfo["tokenGenRate"] as? Double
+      {
+        stats = String(
+          format: "Token generation rate: %.2f tokens/s. Prompt processing rate: %.2f tokens/s", tokenGenRate,
+          promptProcRate)
+      }
+    }
+    .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("TokenGenerationError"))) { notification in
+      if let userInfo = notification.userInfo, let error = userInfo["error"] as? String {
+        errorMessage = error
+        isGenerating = false
+        showAlert = true
+      }
     }
+    .alert(isPresented: $showAlert) {
+      Alert(
+        title: Text("Error"),
+        message: Text(errorMessage),
+        dismissButton: .default(Text("OK"))
+      )
+    }
+
+  }
 }
 
 struct ChatBubble: View {
-    var text: String
-    var isUser: Bool
-
-    var body: some View {
-        HStack {
-            if isUser {
-                Spacer()
-                Text(text)
-                    .padding()
-                    .background(Color.pastelGreen)
-                    .foregroundColor(.white)
-                    .cornerRadius(25)
-                    .padding(.horizontal, 10)
-            } else {
-                Text(text)
-                    .padding()
-                    .background(Color(.systemGray5))
-                    .foregroundColor(.black)
-                    .cornerRadius(25)
-                    .padding(.horizontal, 10)
-                Spacer()
-            }
-        }
+  var text: String
+  var isUser: Bool
+
+  var body: some View {
+    HStack {
+      if isUser {
+        Spacer()
+        Text(text)
+          .padding()
+          .background(Color.pastelGreen)
+          .foregroundColor(.white)
+          .cornerRadius(25)
+          .padding(.horizontal, 10)
+      } else {
+        Text(text)
+          .padding()
+          .background(Color(.systemGray5))
+          .foregroundColor(.black)
+          .cornerRadius(25)
+          .padding(.horizontal, 10)
+        Spacer()
+      }
     }
+  }
 }
 
 struct ContentView_Previews: PreviewProvider {
-    static var previews: some View {
-        ContentView()
-    }
+  static var previews: some View {
+    ContentView()
+  }
 }
 
 // Extension for a pastel green color
 extension Color {
-    static let pastelGreen = Color(red: 0.6, green: 0.9, blue: 0.6)
+  static let pastelGreen = Color(red: 0.6, green: 0.9, blue: 0.6)
 }

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/FolderPicker.swift

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import SwiftUI
+import UIKit
+
+struct FolderPicker: UIViewControllerRepresentable {
+    var onPick: (URL?) -> Void
+
+    func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
+        let picker = UIDocumentPickerViewController(forOpeningContentTypes: [.folder])
+        picker.allowsMultipleSelection = false
+        picker.delegate = context.coordinator
+        return picker
+    }
+
+    func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) {}
+
+    func makeCoordinator() -> Coordinator {
+        Coordinator(onPick: onPick)
+    }
+
+    class Coordinator: NSObject, UIDocumentPickerDelegate {
+        let onPick: (URL?) -> Void
+
+        init(onPick: @escaping (URL?) -> Void) {
+            self.onPick = onPick
+        }
+
+        func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+            onPick(urls.first)
+        }
+
+        func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
+            onPick(nil)
+        }
+    }
+}

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/GenAIGenerator.h

@@ -11,6 +11,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface GenAIGenerator : NSObject
 
+- (void)setModelFolderPath:(nonnull NSString*)modelPath;
 - (void)generate:(NSString *)input_user_question;
 
 @end