[Bug]: Using 2 push SDKs crashed at [OneSignalNotificationsUNUserNotificationCenter onesignalRequestAuthorizationWithOptions:completionHandler:]

[weiqingtangx]

What happened?

pod 'OneSignal/OneSignal', '5.1.3'

OneSignal crashed at [OneSignalNotificationsUNUserNotificationCenter onesignalRequestAuthorizationWithOptions:completionHandler:] when I registered two Push SDKs.

Integration Code

- (void)registOneSignalNotifcation:(NSDictionary *)launchOptions {
    // Remove this method to stop OneSignal Debugging
      [OneSignal.Debug setLogLevel:ONE_S_LL_VERBOSE];
      
      // OneSignal initialization
      [OneSignal initialize:oneSignalKey withLaunchOptions:launchOptions];

      // requestPermission will show the native iOS notification permission prompt.
      // We recommend removing the following code and instead using an In-App Message to prompt for notification permission
      [OneSignal.Notifications requestPermission:^(BOOL accepted) {
        NSLog(@"User accepted notifications: %d", accepted);
      } fallbackToSettings:true];
    
    [OneSignal.Notifications addClickListener:self];
    
    [self cleanBadgeNumber];
}

Steps to reproduce?

1. Integrate JPUSH SDK in AppDelegate
2. Integrate OneSignal SDK in AppDelegate
3. Crashed at OneSignalNotifications`__109-[OneSignalNotificationsUNUserNotificationCenter onesignalRequestAuthorizationWithOptions:completionHandler:]_block_invoke + 136

The reason for the crash is probably related to the below source code of OneSignal, I tried registering OneSignal first, but it still caused a crash of OneSignal. No crash of JPush SDK.

The reason we have 2 Push SDKs together is that we want to migrate from JPUSH to OneSignal SDK, we take the JPUSH SDK as a downgrade option for a while, then remove the JPUSH SDK.

OneSignalNotificationsUNUserNotificationCenter

+ (void)swizzleSelectors {
    injectSelector(
        [UNUserNotificationCenter class],
        @selector(setDelegate:),
        [OneSignalNotificationsUNUserNotificationCenter class],
        @selector(setOneSignalUNDelegate:)
   );
    
    // Overrides to work around 10.2.1 bug where getNotificationSettingsWithCompletionHandler: reports as declined if called before
    //  requestAuthorizationWithOptions:'s completionHandler fires when the user accepts notifications.
    injectSelector(
        [UNUserNotificationCenter class],
        @selector(requestAuthorizationWithOptions:completionHandler:),
        [OneSignalNotificationsUNUserNotificationCenter class],
        @selector(onesignalRequestAuthorizationWithOptions:completionHandler:)
    );
    injectSelector(
        [UNUserNotificationCenter class],
        @selector(getNotificationSettingsWithCompletionHandler:),
        [OneSignalNotificationsUNUserNotificationCenter class],
        @selector(onesignalGetNotificationSettingsWithCompletionHandler:)
   );
}

### What did you expect to happen?

No crash.

### OneSignal iOS SDK version

Release 5.1.3

### iOS version

15

### Specific iOS version

```Markdown
iOS 17.4.1

Relevant log output

* thread #4, queue = 'com.apple.usernotifications.UNUserNotificationServiceConnection.call-out', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
  * frame #0: 0x0000000109e00a58 OneSignalNotifications`__109-[OneSignalNotificationsUNUserNotificationCenter onesignalRequestAuthorizationWithOptions:completionHandler:]_block_invoke + 136
    frame #1: 0x000000010a5e4b98 libdispatch.dylib`_dispatch_call_block_and_release + 32
    frame #2: 0x000000010a5e67bc libdispatch.dylib`_dispatch_client_callout + 20
    frame #3: 0x000000010a5ee66c libdispatch.dylib`_dispatch_lane_serial_drain + 832
    frame #4: 0x000000010a5ef43c libdispatch.dylib`_dispatch_lane_invoke + 460
    frame #5: 0x000000010a5fc404 libdispatch.dylib`_dispatch_root_queue_drain_deferred_wlh + 328
    frame #6: 0x000000010a5fba38 libdispatch.dylib`_dispatch_workloop_worker_thread + 444
    frame #7: 0x00000001f33acf20 libsystem_pthread.dylib`_pthread_wqthread + 288

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[emawby]

@weiqingtangx Thank you for reaching out we will investigate the conflict. It looks like the JPush SDK is not open source (please correct me if I am wrong), but we will do our best to see how the SDKs are conflicting. Just to double check is the app not crashing if you remove either SDK?

[weiqingtangx]

@emawby Thank you for your reply. I investigated their official GitHub, it sounds like there is no source code of JPush iOS SDK. Our app is fine if we remove either SDK.

[weiqingtangx]

Removed the JPush SDK.