Flutter didReceiveRemoteNotification Not called

Question

I've created a plugin which supoort Push Notification but application:didReceiveRemoteNotification:fetchCompletionHandler: not fired The notification is received in the following cases only:

• Call it like this application:didReceiveRemoteNotification:
• Set content_available to true in the notification payload

I'm just wondering why this is happening, can anyone help me to figure out how can I make it work with application:didReceiveRemoteNotification:fetchCompletionHandler: ?

Answer 1

Do you use FlutterAppDelegate as superclass of AppDelegte? In FlutterAppDelegate.mm, it replaced method respondsToSelector like below

- (BOOL)respondsToSelector:(SEL)selector {
  if ([_lifeCycleDelegate isSelectorAddedDynamically:selector]) {
    return [self delegateRespondsSelectorToPlugins:selector];
  }
  return [super respondsToSelector:selector];
}

And there is implementation of in FlutterPluginAppLifeCycleDelegate

static const SEL selectorsHandledByPlugins[] = {
    @selector(application:didReceiveRemoteNotification:fetchCompletionHandler:),
    @selector(application:performFetchWithCompletionHandler:)};


- (BOOL)isSelectorAddedDynamically:(SEL)selector {
  for (const SEL& aSelector : selectorsHandledByPlugins) {
    if (selector == aSelector) {
      return YES;
    }
  }
  return NO;
}

So for calling of application:didReceiveRemoteNotification:fetchCompletionHandler: it will call selctor in FlutterPluginAppLifeCycleDelegate

- (void)application:(UIApplication*)application
    didReceiveRemoteNotification:(NSDictionary*)userInfo
          fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler {
  for (NSObject<FlutterApplicationLifeCycleDelegate>* delegate in _delegates) {
    if (!delegate) {
      continue;
    }
    if ([delegate respondsToSelector:_cmd]) {
      if ([delegate application:application
              didReceiveRemoteNotification:userInfo
                    fetchCompletionHandler:completionHandler]) {
        return;
      }
    }
  }
}

Maybe some plugins break the chain of calls. It's my guess base Flutter Engine source code and I do not confirm it in a debug build of flutter engine.