PubNub Objective-C Subscribe to Channel and Add Receive Observer

PNMessage.m

// Message Receive Event for All Subscribed Channels
- (void)pubnubClient:(PubNub *)client didReceiveMessage:(PNMessage *)msg
{
   NSLog(@"Message Received:\n    Channel:%@\n    Message:%@", msg.channel.name, [msg message]);
}

- (void) subscribeToChannel:(NSString*)channelName
{
   
   PNChannel* channel = [PNChannel channelWithName:channelName];
   
    // Subscribe to the Channel, on Subscribe, Create Observer
   [PubNub subscribeOnChannel:pnChannel withCompletionHandlingBlock:^(PNSubscriptionProcessState state, NSArray *a, PNError *e) {
        switch(state) {
            case PNSubscriptionProcessWillRestoreState:
                break;
            case PNSubscriptionProcessRestoredState:
                break;
            // Subscribe Completed & Succeeded
            case PNSubscriptionProcessSubscribedState:
              NSLog(@"Subscribed to \"%@\" channel... done!", channelName);
      
              // Specific Channel Observer Pattern (Add Observer)
              [[PNObservationCenter defaultCenter]
                  addMessageReceiveObserver:nil
                                  withBlock:^(PNMessage * msg)
                  {
                  
                     if ([msg.channel.name isEqualToString:channelName]) {
                        // Do Stuff with Message Here
                        NSLog(@"\"%@\" Received Message:\n    Message:%@", msg.channel.name, [msg message]);
                  }
                  break;
               // Subscribe Failed
               case PNSubscriptionProcessNotSubscribedState:
                NSLog(@"Subscribing to \"%@\" channel... error!", channelName);
                break;
        }
    }];
}