Merge pull request #1601 from essaji/rel/rn_5.0.3

Fix: prevent addNotificationForegroundLifecycleListener getting called multiple times

Author: jennantilla

ios/RCTOneSignal/RCTOneSignalEventEmitter.m

@@ -10,7 +10,7 @@ @implementation RCTOneSignalEventEmitter {
     BOOL _hasSetSubscriptionObserver;
     BOOL _hasSetPermissionObserver;
     BOOL _hasAddedNotificationClickListener;
-    BOOL _hasAddedNotificationLifecycleListener;
+    BOOL _hasAddedNotificationForegroundLifecycleListener;
     BOOL _hasAddedInAppMessageClickListener;
     BOOL _hasAddedInAppMessageLifecycleListener;
     NSMutableDictionary* _preventDefaultCache;
@@ -264,7 +264,10 @@ + (void)sendEventWithName:(NSString *)name withBody:(NSDictionary *)body {
 }
 
 RCT_EXPORT_METHOD(addNotificationForegroundLifecycleListener) {
-    [OneSignal.Notifications addForegroundLifecycleListener:self];
+    if (!_hasAddedNotificationForegroundLifecycleListener) {
+        [OneSignal.Notifications addForegroundLifecycleListener:self];
+        _hasAddedNotificationForegroundLifecycleListener = true;
+    }
 }
 
 RCT_EXPORT_METHOD(onWillDisplayNotification:(OSNotificationWillDisplayEvent *)event){
@@ -424,4 +427,4 @@ + (void)sendEventWithName:(NSString *)name withBody:(NSDictionary *)body {
     // iOS Stub
 }
 
-@end
+@end