GKMatchmaker findMatchForRequest invite never received

Question

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

GKMatchMaker startBrowsingForNearbyPlayersWithHandler works

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."

Answer 3

I know this an older post, but I ran across it when trying to establish a connection between several app instances over the internet. I believe the part you're missing is that after registering for the listener, you need to receive the connected status with

    - (void)match:(GKMatch *)match
        player:(GKPlayer *)player
        didChangeConnectionState:(GKPlayerConnectionState)state
 {
     NSLog(@">>> did change state");

     if (state == GKPlayerStateConnected)
     {
         NSLog(@">>>> match:%@ did change to Connected for player %@ ",match, player.displayName);

     }
   else if (state == GKPlayerStateDisconnected)
   {
    NSLog(@">>>> match:%@ disconnected for player %@ ",match, player.displayName);
   }

I find the match has 0 players when the completionHandler is called from findMatchForRequest:, but that I can successfully use the GKMatch and GKPlayer as returned in didChangeConnectionState: Hope that helps someone who reads this long after the OP.