GKMatchmaker findMatchForRequest invite never rece

Question

I'm trying to invite nearby players to a match, but the invite is either never sent or never received.

GKMatchMaker startBrowsingForNearbyPlayersWithHandler works and returns nearby players that are on same wifi, but then I use findMatchForRequest and it returns a match without any players, and the players I try to invite never receive an invite notification. Here is my code.

I start by authenticating the local player:

GKLocalPlayer.localPlayer.authenticateHandler= ^(UIViewController *controller, NSError *error)
{
    if (error)
    {
        NSLog(@"%s:: Error authenticating: %@", __PRETTY_FUNCTION__, error.localizedDescription);
        return;
    }
    if(controller)
    {
        // User has not yet authenticated
        [pViewController presentViewController:controller animated:YES completion:^(void)
         {
             [self lookForNearbyPlayers];
         }];
        return;
    }
    [self lookForNearbyPlayers];
};

-(void)lookForNearbyPlayers
{
    if(!GKLocalPlayer.localPlayer.authenticated)
    {
        NSLog(@"%s:: User not authenticated", __PRETTY_FUNCTION__);
        return;
    }

I register my view controller as a delegate of GKLocalPlayerListener:

    [GKLocalPlayer.localPlayer registerListener:self]; // self is a view controller.

    // This works. My test local player which is a second device and appleID I setup shows up when this handler is called.
    [GKMatchmaker.sharedMatchmaker startBrowsingForNearbyPlayersWithHandler:^(GKPlayer *player, BOOL reachable)
    {
         NSArray * paPlayers= [NSArray arrayWithObject:player];
         _pMatchRequest= [[GKMatchRequest alloc] init];
         _pMatchRequest.minPlayers= 2;
         _pMatchRequest.maxPlayers= 4;
         _pMatchRequest.recipients = paPlayers;
         _pMatchRequest.inviteMessage = @"Join our match!";
         _pMatchRequest.recipientResponseHandler = ^(GKPlayer *player, GKInviteeResponse response)
         {
             // This is never called.
             NSLog((response == GKInviteeResponseAccepted) ? @"Player %@ Accepted" : @"Player %@ Declined", player.alias);
         };

         // This returns with a match without any players.
         [GKMatchmaker.sharedMatchmaker findMatchForRequest:_pMatchRequest withCompletionHandler:^(GKMatch *match, NSError *error)
          {
              if(error)
              {
                  NSLog(@"%s:: %@", __PRETTY_FUNCTION__, error.localizedDescription);
                  return;
              }
              else if(match != nil)
              {
                  _pMatch= match;
                  match.delegate = self;
                  NSLog(@"players count= %lu", (unsigned long)_pMatch.players.count); // Always returns 0
              }
          }];
     }
}

I have delegate methods for GKLocalPlayerListener setup, but they are never called:

- (void)player:(GKPlayer *)player didRequestMatchWithRecipients:(NSArray<GKPlayer *> *)recipientPlayers
{
    NSLog(@"%s", __PRETTY_FUNCTION__);
}

- (void)player:(GKPlayer *)player didAcceptInvite:(GKInvite *)invite
{
    NSLog(@"%s", __PRETTY_FUNCTION__);
}

Does anyone know how to get this to work without GKMatchmakerViewController and for iOS9? The only examples I can find have the deprecated -inviteHandler method.

Answer 1

This code is working in Swift if you know how you can convert it to Objective-C and to try it.

GKMatchmaker.sharedMatchmaker().findMatchForRequest(
    request,
    withCompletionHandler: {(match : GKMatch!, error: NSError!) -> Void in
        NSLog("This works")
})

Answer 2

Based on multiple questions here on SO, Game Center seems to be getting stuck from time to time. In the best case, it returns "Game not recognized" errors. In the worst case, it just cheerfully returns nil to GC calls. Sometimes it resumes working on it's own, sometimes it doesn't. But it seems you can kickstart it again by logging into iTunesConnect and do any of the following:

1. Add a leaderboard
2. Change the default leaderboard
3. Add an achievement

I've added this to my debugging routine. If some aspect of GC stops working, or returns nil, I try making one of the above changes in iTunesConnect before proceeding. In my case, I get the "game not recognized" several times per week, but several others have noted the "nil return values."