React Native OneSignal Background Notification Issue in iOS - ios

Question

I followed this guide to setup the OneSignal background notification in My react native App: https://documentation.onesignal.com/docs/rn-android-native-module-setup-for-notification-service-extension#ios-notification-service-extension-module
Background notification is working as expected when I installed the App directly to My device through Xcode. But when I archive the build and install it from TestFlight, background notification doesn't work. Unless emitNotificationEvent event I added is not get triggered, even though the push notification is received.
When I trace the issue with Archived Build in Xcode (Using device console), noticed that _instance is null in NotificationExtensionModule.m. Anyone experienced similar issue or any idea what could be the reason ?
Note
Xcode Version: 13.4
Receiving the push notification in both instance (from test flight or direct install)
To put a new version in TestFlight, used to increase the build number with same version number.
Tried cleaning the build folder, re-installing the pods, nothing worked still
Adding the code snippet for further understanding of My issue:
AppDelegate.h
#import <Foundation/Foundation.h>
#import <React/RCTBridgeDelegate.h>
#import <UIKit/UIKit.h>
#import <UserNotifications/UserNotifications.h>
#interface AppDelegate : UIResponder <UIApplicationDelegate,RCTBridgeDelegate,UNUserNotificationCenterDelegate>
#property (nonatomic, strong) UIWindow *window;
#end
AppDelegate.m
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
//access NotificationServiceExtensionModule emitNotificationEvent method
[NotificationServiceExtensionModule.sharedInstance emitNotificationEvent:userInfo ];
completionHandler(UIBackgroundFetchResultNoData);
}
NotificationServiceExtensionModule.h
#import <foundation/Foundation.h>
// NotificationServiceExtensionModule.h
#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>
#interface NotificationServiceExtensionModule : RCTEventEmitter <RCTBridgeModule>
+ (NotificationServiceExtensionModule*) sharedInstance;
- (void)emitNotificationEvent:(NSDictionary *)userInfo;
#end
NotificationServiceExtensionModule.m
#import <Foundation/Foundation.h>
// NotificationServiceExtensionModule.m
#import "NotificationServiceExtensionModule.h"
#implementation NotificationServiceExtensionModule
static NotificationServiceExtensionModule* _instance = nil;
+(NotificationServiceExtensionModule*) sharedInstance {
// #synchronized( _instance ) {
// if( !_instance ) {
// _instance = [[NotificationServiceExtensionModule alloc] init];
// }
// }
return _instance; // this returns null when installed from TestFlight.
}
// To export a module named NotificationServiceExtensionModule
RCT_EXPORT_MODULE();
- (NSArray<NSString *> *)supportedEvents
{
NSLog(#"Supported EVENTS__________________________");
_instance = self;
return #[#"NotificationEvent"];
}
- (void)emitNotificationEvent:(NSDictionary *)userInfo
{
NSString *eventName = userInfo[#"custom"][#"a"];
[self sendEventWithName:#"NotificationEvent" body:#{#"notificationPayload": eventName}];
}
#end

Answer 1

You can use the following code to check if the app is running in the background or foreground:
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
//access NotificationServiceExtensionModule emitNotificationEvent method
[NotificationServiceExtensionModule.sharedInstance emitNotificationEvent:userInfo ];
if (application.applicationState == UIApplicationStateActive) {
// App was in the foreground when the notification was received
} else {
// App was in the background when the notification was received
}
completionHandler(UIBackgroundFetchResultNoData);
}