feat(iOS): Add CarPlay notification support with IOSInitializationSettings

Author: derrik-fleming

flutter_local_notifications/README.md

@@ -101,6 +101,7 @@ Note: the plugin requires Flutter SDK 3.22 at a minimum. The list of support pla
 * [Android] Start a foreground service
 * [Android] Ability to check if notifications are enabled
 * [iOS (all supported versions) & macOS 10.14+] Request notification permissions and customise the permissions being requested around displaying notifications
+* [iOS 10+] Request CarPlay notification permissions for notifications to appear in CarPlay interface
 * [iOS 10 or newer and macOS 10.14 or newer] Display notifications with attachments
 * [iOS 12.0+] Support for custom notification settings UI via "Configure Notifications in <application name>" button in notification context menu (API available on macOS 10.14+ but UI button does not appear in practice)
 * [iOS and macOS 10.14 or newer] Ability to check if notifications are enabled with specific type check
@@ -674,6 +675,62 @@ Initialisation can be done in the `main` function of your application or can be
 
 Note that all settings are nullable, because we don't want to force developers so specify settings for platforms they don't target. You will get a runtime ArgumentError Exception if you forgot to pass the settings for the platform you target.
 
+### [iOS-specific] Using IOSInitializationSettings
+
+Starting from version 17.3.0, iOS developers can use the more specific `IOSInitializationSettings` class instead of `DarwinInitializationSettings` to access iOS-only features like CarPlay notification permissions. The `IOSInitializationSettings` class extends `DarwinInitializationSettings`, so all existing Darwin features are still available.
+
+```dart
+const AndroidInitializationSettings initializationSettingsAndroid =
+    AndroidInitializationSettings('app_icon');
+final IOSInitializationSettings initializationSettingsIOS =
+    IOSInitializationSettings(
+        // Darwin settings
+        requestAlertPermission: true,
+        requestBadgePermission: true,
+        requestSoundPermission: true,
+        // iOS-specific settings
+        requestCarPlayPermission: true,
+    );
+final DarwinInitializationSettings initializationSettingsDarwin =
+    DarwinInitializationSettings();
+final InitializationSettings initializationSettings = InitializationSettings(
+    android: initializationSettingsAndroid,
+    iOS: initializationSettingsIOS,  // Use iOS-specific settings
+    macOS: initializationSettingsDarwin,  // Keep Darwin for macOS
+);
+```
+
+#### CarPlay Integration
+
+When `requestCarPlayPermission` is set to `true`, the plugin will request CarPlay notification permissions if the device supports it (iOS 10.0+). This allows your app's notifications to appear on the CarPlay interface when the device is connected to a compatible vehicle.
+
+**Important considerations:**
+- CarPlay permissions are only available on iOS 10.0 and later
+- The permission request will be silently ignored on unsupported devices
+- CarPlay notifications follow the same content guidelines as regular iOS notifications
+- Test CarPlay integration using the iOS Simulator's CarPlay mode
+
+#### Migration from DarwinInitializationSettings
+
+Existing code using `DarwinInitializationSettings` for iOS will continue to work without changes. To migrate to iOS-specific features:
+
+1. Replace `DarwinInitializationSettings` with `IOSInitializationSettings` in your iOS initialization
+2. Add any iOS-specific options like `requestCarPlayPermission`
+3. Keep using `DarwinInitializationSettings` for macOS initialization
+
+```dart
+// Before (still works)
+final DarwinInitializationSettings initializationSettingsDarwin =
+    DarwinInitializationSettings(requestAlertPermission: true);
+
+// After (with iOS-specific features)
+final IOSInitializationSettings initializationSettingsIOS =
+    IOSInitializationSettings(
+        requestAlertPermission: true,
+        requestCarPlayPermission: true,
+    );
+```
+
 ```dart
 void onDidReceiveNotificationResponse(NotificationResponse notificationResponse) async {
     final String? payload = notificationResponse.payload;

flutter_local_notifications/example/integration_test/flutter_local_notifications_test.dart

@@ -8,8 +8,8 @@ void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
   const AndroidInitializationSettings initializationSettingsAndroid =
       AndroidInitializationSettings('app_icon');
-  const DarwinInitializationSettings initializationSettingsIOS =
-      DarwinInitializationSettings();
+  const IOSInitializationSettings initializationSettingsIOS =
+      IOSInitializationSettings();
   const DarwinInitializationSettings initializationSettingsMacOS =
       DarwinInitializationSettings();
   final LinuxInitializationSettings initializationSettingsLinux =

flutter_local_notifications/example/lib/main.dart

@@ -136,7 +136,14 @@ Future<void> main() async {
 
   /// Note: permissions aren't requested here just to demonstrate that can be
   /// done later
-  final DarwinInitializationSettings initializationSettingsDarwin =
+  final IOSInitializationSettings initializationSettingsIOS =
+      IOSInitializationSettings(
+    requestAlertPermission: false,
+    requestBadgePermission: false,
+    requestSoundPermission: false,
+    notificationCategories: darwinNotificationCategories,
+  );
+  final DarwinInitializationSettings initializationSettingsMacOS =
       DarwinInitializationSettings(
     requestAlertPermission: false,
     requestBadgePermission: false,
@@ -152,8 +159,8 @@ Future<void> main() async {
 
   final InitializationSettings initializationSettings = InitializationSettings(
     android: initializationSettingsAndroid,
-    iOS: initializationSettingsDarwin,
-    macOS: initializationSettingsDarwin,
+    iOS: initializationSettingsIOS,
+    macOS: initializationSettingsMacOS,
     linux: initializationSettingsLinux,
     windows: windows.initSettings,
   );

flutter_local_notifications/ios/flutter_local_notifications/Sources/flutter_local_notifications/FlutterLocalNotificationsPlugin.m

@@ -49,6 +49,7 @@ @implementation FlutterLocalNotificationsPlugin {
 NSString *const REQUEST_PROVISIONAL_PERMISSION =
     @"requestProvisionalPermission";
 NSString *const REQUEST_CRITICAL_PERMISSION = @"requestCriticalPermission";
+NSString *const REQUEST_CARPLAY_PERMISSION = @"requestCarPlayPermission";
 NSString *const REQUEST_PROVIDES_APP_NOTIFICATION_SETTINGS =
     @"requestProvidesAppNotificationSettings";
 NSString *const DEFAULT_PRESENT_ALERT = @"defaultPresentAlert";
@@ -61,6 +62,7 @@ @implementation FlutterLocalNotificationsPlugin {
 NSString *const BADGE_PERMISSION = @"badge";
 NSString *const PROVISIONAL_PERMISSION = @"provisional";
 NSString *const CRITICAL_PERMISSION = @"critical";
+NSString *const CARPLAY_PERMISSION = @"carPlay";
 NSString *const PROVIDES_APP_NOTIFICATION_SETTINGS =
     @"providesAppNotificationSettings";
 NSString *const CALLBACK_DISPATCHER = @"callbackDispatcher";
@@ -112,6 +114,7 @@ @implementation FlutterLocalNotificationsPlugin {
 NSString *const IS_CRITICAL_ENABLED = @"isCriticalEnabled";
 NSString *const IS_PROVIDES_APP_NOTIFICATION_SETTINGS_ENABLED =
     @"isProvidesAppNotificationSettingsEnabled";
+NSString *const IS_CAR_PLAY_ENABLED = @"isCarPlayEnabled";
 
 NSString *const CRITICAL_SOUND_VOLUME = @"criticalSoundVolume";
 
@@ -353,6 +356,8 @@ - (void)initialize:(NSDictionary *_Nonnull)arguments
   bool requestedBadgePermission = false;
   bool requestedProvisionalPermission = false;
   bool requestedCriticalPermission = false;
+  bool requestedCarPlayPermission = false;
+  bool carPlayPermissionSpecified = false;
   bool requestedProvidesAppNotificationSettings = false;
   NSMutableDictionary *presentationOptions = [[NSMutableDictionary alloc] init];
   if ([self containsKey:DEFAULT_PRESENT_ALERT forDictionary:arguments]) {
@@ -401,6 +406,11 @@ - (void)initialize:(NSDictionary *_Nonnull)arguments
     requestedCriticalPermission =
         [arguments[REQUEST_CRITICAL_PERMISSION] boolValue];
   }
+  if ([self containsKey:REQUEST_CARPLAY_PERMISSION forDictionary:arguments]) {
+    carPlayPermissionSpecified = true;
+    requestedCarPlayPermission =
+        [arguments[REQUEST_CARPLAY_PERMISSION] boolValue];
+  }
   if ([self containsKey:REQUEST_PROVIDES_APP_NOTIFICATION_SETTINGS
           forDictionary:arguments]) {
     requestedProvidesAppNotificationSettings =
@@ -426,6 +436,8 @@ - (void)initialize:(NSDictionary *_Nonnull)arguments
                                       requestedProvisionalPermission
                                      criticalPermission:
                                          requestedCriticalPermission
+                                      carPlayPermission:requestedCarPlayPermission
+                                 carPlayPermissionSpecified:carPlayPermissionSpecified
                         providesAppNotificationSettings:
                             requestedProvidesAppNotificationSettings
                                                  result:result];
@@ -440,6 +452,8 @@ - (void)requestPermissions:(NSDictionary *_Nonnull)arguments
   bool badgePermission = false;
   bool provisionalPermission = false;
   bool criticalPermission = false;
+  bool requestCarPlayPermission = false;
+  bool carPlayPermissionSpecified = false;
   bool providesAppNotificationSettings = false;
   if ([self containsKey:SOUND_PERMISSION forDictionary:arguments]) {
     soundPermission = [arguments[SOUND_PERMISSION] boolValue];
@@ -456,6 +470,12 @@ - (void)requestPermissions:(NSDictionary *_Nonnull)arguments
   if ([self containsKey:CRITICAL_PERMISSION forDictionary:arguments]) {
     criticalPermission = [arguments[CRITICAL_PERMISSION] boolValue];
   }
+  if ([self containsKey:CARPLAY_PERMISSION forDictionary:arguments]) {
+    carPlayPermissionSpecified = true;
+    requestCarPlayPermission =
+        [arguments[CARPLAY_PERMISSION] boolValue];
+
+  }
   if ([self containsKey:PROVIDES_APP_NOTIFICATION_SETTINGS
           forDictionary:arguments]) {
     providesAppNotificationSettings =
@@ -466,6 +486,8 @@ - (void)requestPermissions:(NSDictionary *_Nonnull)arguments
                       badgePermission:badgePermission
                 provisionalPermission:provisionalPermission
                    criticalPermission:criticalPermission
+                   carPlayPermission:requestCarPlayPermission
+              carPlayPermissionSpecified:carPlayPermissionSpecified
       providesAppNotificationSettings:providesAppNotificationSettings
                                result:result];
 }
@@ -475,6 +497,8 @@ - (void)requestPermissionsImpl:(bool)soundPermission
                     badgePermission:(bool)badgePermission
               provisionalPermission:(bool)provisionalPermission
                  criticalPermission:(bool)criticalPermission
+                 carPlayPermission:(bool)carPlayPermission
+            carPlayPermissionSpecified:(bool)carPlayPermissionSpecified
     providesAppNotificationSettings:(bool)providesAppNotificationSettings
                              result:(FlutterResult _Nonnull)result {
   if (!soundPermission && !alertPermission && !badgePermission &&
@@ -495,6 +519,11 @@ - (void)requestPermissionsImpl:(bool)soundPermission
   if (badgePermission) {
     authorizationOptions += UNAuthorizationOptionBadge;
   }
+  if (@available(iOS 10.0, *)) {
+    if (carPlayPermissionSpecified && carPlayPermission) {
+      authorizationOptions += UNAuthorizationOptionCarPlay;
+    }
+  }
   if (@available(iOS 12.0, *)) {
     if (provisionalPermission) {
       authorizationOptions += UNAuthorizationOptionProvisional;
@@ -530,6 +559,7 @@ - (void)checkPermissions:(NSDictionary *_Nonnull)arguments
     BOOL isProvisionalEnabled = false;
     BOOL isCriticalEnabled = false;
     BOOL isProvidesAppNotificationSettingsEnabled = false;
+    BOOL isCarPlayEnabled = false;
 
     if (@available(iOS 12.0, *)) {
       isProvisionalEnabled =
@@ -540,6 +570,11 @@ - (void)checkPermissions:(NSDictionary *_Nonnull)arguments
           settings.providesAppNotificationSettings;
     }
 
+    if (@available(iOS 10.0, *)) {
+      isCarPlayEnabled =
+          settings.carPlaySetting == UNNotificationSettingEnabled;
+    }
+
     NSDictionary *dict = @{
       IS_NOTIFICATIONS_ENABLED : @(isEnabled),
       IS_SOUND_ENABLED : @(isSoundEnabled),
@@ -549,6 +584,7 @@ - (void)checkPermissions:(NSDictionary *_Nonnull)arguments
       IS_CRITICAL_ENABLED : @(isCriticalEnabled),
       IS_PROVIDES_APP_NOTIFICATION_SETTINGS_ENABLED :
           @(isProvidesAppNotificationSettingsEnabled),
+      IS_CAR_PLAY_ENABLED : @(isCarPlayEnabled),
     };
 
     result(dict);

flutter_local_notifications/lib/src/initialization_settings.dart

@@ -21,6 +21,10 @@ class InitializationSettings {
   ///
   /// It is nullable, because we don't want to force users to specify settings
   /// for platforms that they don't target.
+  /// 
+  /// You can pass either DarwinInitializationSettings or 
+  /// IOSInitializationSettings. Use IOSInitializationSettings to access 
+  /// iOS-specific features like CarPlay.
   final DarwinInitializationSettings? iOS;
 
   /// Settings for macOS.

flutter_local_notifications/lib/src/platform_flutter_local_notifications.dart

@@ -648,10 +648,14 @@ class IOSFlutterLocalNotificationsPlugin
 
   DidReceiveNotificationResponseCallback? _onDidReceiveNotificationResponse;
 
-  /// Initializes the plugin.
+  /// Initializes the plugin for iOS.
   ///
   /// Call this method on application before using the plugin further.
   ///
+  /// Accepts either [DarwinInitializationSettings] for basic Darwin-based 
+  /// configuration or [IOSInitializationSettings] for iOS-specific features
+  /// like CarPlay notifications.
+  ///
   /// Initialisation may also request notification permissions where users will
   /// see a permissions prompt. This may be fine in cases where it's acceptable
   /// to do this when the application runs for the first time. However, if your
@@ -664,6 +668,11 @@ class IOSFlutterLocalNotificationsPlugin
   /// [requestPermissions] can then be called to request permissions when
   /// needed.
   ///
+  /// When using [IOSInitializationSettings], CarPlay notifications can be 
+  /// enabled by setting [IOSInitializationSettings.requestCarPlayPermission]
+  /// to true. When using [DarwinInitializationSettings], CarPlay is disabled
+  /// by default.
+  ///
   /// The [onDidReceiveNotificationResponse] callback is fired when the user
   /// selects a notification or notification action that should show the
   /// application/user interface.
@@ -684,7 +693,17 @@ class IOSFlutterLocalNotificationsPlugin
     _onDidReceiveNotificationResponse = onDidReceiveNotificationResponse;
     _channel.setMethodCallHandler(_handleMethod);
 
-    final Map<String, Object> arguments = initializationSettings.toMap();
+    // Convert to map using appropriate mapper based on runtime type
+    // IOSInitializationSettings.toMap() automatically includes CarPlay field
+    // DarwinInitializationSettings.toMap() does not include CarPlay field
+    final Map<String, Object> arguments;
+    if (initializationSettings is IOSInitializationSettings) {
+      // Explicitly call iOS mapper extension
+      arguments = (initializationSettings as IOSInitializationSettings).toMap();
+    } else {
+      // Use Darwin mapper for DarwinInitializationSettings  
+      arguments = initializationSettings.toMap();
+    }
 
     _evaluateBackgroundNotificationCallback(
         onDidReceiveBackgroundNotificationResponse, arguments);
@@ -694,12 +713,17 @@ class IOSFlutterLocalNotificationsPlugin
 
   /// Requests the specified permission(s) from user and returns current
   /// permission status.
+  ///
+  /// On iOS, the [carPlay] parameter requests permission to show notifications
+  /// on CarPlay when connected to a compatible vehicle. This requires iOS 10.0+
+  /// and is only applicable to iOS devices.
   Future<bool?> requestPermissions({
     bool sound = false,
     bool alert = false,
     bool badge = false,
     bool provisional = false,
     bool critical = false,
+    bool carPlay = false,
     bool providesAppNotificationSettings = false,
   }) =>
       _channel.invokeMethod<bool?>('requestPermissions', <String, bool>{
@@ -708,6 +732,7 @@ class IOSFlutterLocalNotificationsPlugin
         'badge': badge,
         'provisional': provisional,
         'critical': critical,
+        'carPlay': carPlay,
         'providesAppNotificationSettings': providesAppNotificationSettings,
       });
 
@@ -730,6 +755,7 @@ class IOSFlutterLocalNotificationsPlugin
             isCriticalEnabled: dict['isCriticalEnabled'] ?? false,
             isProvidesAppNotificationSettingsEnabled:
                 dict['isProvidesAppNotificationSettingsEnabled'] ?? false,
+            isCarPlayEnabled: dict['isCarPlayEnabled'] ?? false,
           );
         },
       );

flutter_local_notifications/lib/src/platform_specifics/darwin/initialization_settings.dart

@@ -160,3 +160,34 @@ class DarwinInitializationSettings {
   /// On macOS, this is only applicable to macOS 10.14 or newer.
   final List<DarwinNotificationCategory> notificationCategories;
 }
+
+/// Plugin initialization settings for iOS
+class IOSInitializationSettings extends DarwinInitializationSettings {
+  /// Constructs an instance of [IOSInitializationSettings].
+  const IOSInitializationSettings({
+    super.requestAlertPermission = true,
+    super.requestSoundPermission = true,
+    super.requestBadgePermission = true,
+    super.requestProvisionalPermission = false,
+    super.requestCriticalPermission = false,
+    super.requestProvidesAppNotificationSettings = false,
+    this.requestCarPlayPermission = false,
+    super.defaultPresentAlert = true,
+    super.defaultPresentSound = true,
+    super.defaultPresentBadge = true,
+    super.defaultPresentBanner = true,
+    super.defaultPresentList = true,
+    super.notificationCategories = const <DarwinNotificationCategory>[],
+  });
+
+  /// Request permission to show notifications on CarPlay.
+  ///
+  /// This permission allows the app to display notifications on the CarPlay
+  /// interface when connected to a compatible vehicle.
+  ///
+  /// Default value is false.
+  ///
+  /// This property is only applicable to iOS 10.0 or newer and is iOS-only.
+  /// CarPlay is not available on macOS.
+  final bool requestCarPlayPermission;
+}

flutter_local_notifications/lib/src/platform_specifics/darwin/mappers.dart

@@ -51,6 +51,16 @@ extension DarwinInitializationSettingsMapper on DarwinInitializationSettings {
       };
 }
 
+extension IOSInitializationSettingsMapper on IOSInitializationSettings {
+  Map<String, Object> toMap() {
+    final DarwinInitializationSettings darwinSettings = 
+        this as DarwinInitializationSettings;
+    final Map<String, Object> map = darwinSettings.toMap();
+    map['requestCarPlayPermission'] = requestCarPlayPermission;
+    return map;
+  }
+}
+
 extension on DarwinNotificationAttachmentThumbnailClippingRect {
   Map<String, Object> toMap() => <String, Object>{
         'x': x,