Make audio playback toggle present during session

Author: daymxn

firebaseai/FirebaseAIExample/Features/Live/Screens/LiveScreen.swift

@@ -50,9 +50,11 @@ struct LiveScreen: View {
       )
 
       #if targetEnvironment(simulator)
-        if viewModel.state == .idle {
-          AudioOutputToggle(isEnabled: $viewModel.isAudioOutputEnabled)
-        }
+        AudioOutputToggle(isEnabled: $viewModel.isAudioOutputEnabled, onChange: {
+          Task {
+            await viewModel.onAudioPlaybackChanged()
+          }
+        })
       #endif
     }
     .padding()

firebaseai/FirebaseAIExample/Features/Live/ViewModels/LiveViewModel.swift

@@ -96,6 +96,7 @@ class LiveViewModel: ObservableObject {
 
     guard await requestRecordPermission() else {
       logger.warning("The user denied us permission to record the microphone.")
+      isAudioOutputEnabled = false
       return
     }
 
@@ -118,6 +119,16 @@ class LiveViewModel: ObservableObject {
     }
   }
 
+  func onAudioPlaybackChanged() async {
+    if isAudioOutputEnabled {
+      guard await requestRecordPermission() else {
+        logger.warning("The user denied us permission to record the microphone.")
+        isAudioOutputEnabled = false
+        return
+      }
+    }
+  }
+
   /// Disconnects the model.
   ///
   /// Will stop any pending playback, and the recording of the mic.

firebaseai/FirebaseAIExample/Features/Live/Views/AudioOutputToggle.swift

@@ -16,11 +16,13 @@ import SwiftUI
 
 struct AudioOutputToggle: View {
   @Binding var isEnabled: Bool
+  var onChange: (Bool) -> Void = { _ in }
 
   var body: some View {
     VStack(alignment: .leading, spacing: 5) {
-      Toggle("Audio Output", isOn: $isEnabled)
-        .toggleStyle(.switch)
+      Toggle("Audio Output", isOn: $isEnabled).onChange(of: isEnabled) { _, new in
+        onChange(new)
+      }
 
       Text("""
       Audio output works best on physical devices. Enable this to test playback in the \