Adding permissionNative on notifications for iOS

Author: emawby

ios/Classes/OSFlutterNotifications.m

@@ -56,6 +56,8 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
 - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result { 
     if ([@"OneSignal#permission" isEqualToString:call.method])
         result(@([OneSignal.Notifications permission]));
+    else if ([@"OneSignal#permissionNative" isEqualToString:call.method])
+        [self permissionNative:call withResult:result];
     else if ([@"OneSignal#canRequest" isEqualToString:call.method])
         result(@([OneSignal.Notifications canRequestPermission]));
     else if ([@"OneSignal#clearAll" isEqualToString:call.method])
@@ -76,6 +78,11 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
         result(FlutterMethodNotImplemented);
 }
 
+- (void)permissionNative:(FlutterMethodCall *)call withResult:(FlutterResult)result {
+    OSNotificationPermission *permission = [OneSignal.Notifications permissionNative];
+    result(@((int)permission));
+}
+
 - (void)clearAll:(FlutterMethodCall *)call  withResult:(FlutterResult)result {
     [OneSignal.Notifications clearAll];
     result(nil);

lib/src/notifications.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:io';
 import 'package:flutter/services.dart';
+import 'package:onesignal_flutter/src/defines.dart';
 import 'package:onesignal_flutter/src/notification.dart';
 import 'package:onesignal_flutter/src/permission.dart';
 
@@ -31,6 +32,24 @@ class OneSignalNotifications {
     return _permission;
   }
 
+  /// iOS only
+  /// enum OSNotificationPermission {
+  /// notDetermined,
+  /// denied,
+  /// authorized,
+  /// provisional, // only available in iOS 12
+  /// ephemeral, // only available in iOS 14
+  Future<OSNotificationPermission> permissionNative() async {
+    if (Platform.isIOS) {
+      return OSNotificationPermission
+          .values[await _channel.invokeMethod("OneSignal#permissionNative")];
+    } else {
+      return _permission
+          ? OSNotificationPermission.authorized
+          : OSNotificationPermission.denied;
+    }
+  }
+
   /// Whether attempting to request notification permission will show a prompt.
   /// Returns true if the device has not been prompted for push notification permission already.
   Future<bool> canRequest() async {