getInitialNotification implemented on iOS

RNNotifications/RNNotifications.m

@@ -513,6 +513,14 @@ RCT_EXPORT_METHOD(requestPermissionsWithCategories:(NSArray *)json)
     [RNNotifications requestPermissionsWithCategories:categories];
 }
 
+RCT_EXPORT_METHOD(getInitialNotification:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
+{
+    NSDictionary * notification = nil;
+    notification = [RNNotificationsBridgeQueue sharedInstance].openedRemoteNotification;
+    [RNNotificationsBridgeQueue sharedInstance].openedRemoteNotification = nil;
+    resolve(notification);
+}
+
 RCT_EXPORT_METHOD(log:(NSString *)message)
 {
     NSLog(message);

index.ios.js

@@ -180,6 +180,15 @@ export default class NotificationsIOS {
     NativeRNNotifications.log(message);
   }
 
+  static async getInitialNotification() {
+    const notification = await NativeRNNotifications.getInitialNotification();
+    if (notification) {
+      return new IOSNotification(notification);
+    } else {
+      return undefined;
+    }
+  }
+
   /**
    * Presenting local notification
    *