chooseBestHostPlayerWithCompletionHandler returns null

Question

The following code returns best host as null. How can I get it to work?

[gameKitHelper.match chooseBestHostPlayerWithCompletionHandler: ^(NSString *playerID) {
    gameKitHelper.hostingPlayer = [playerID retain];
    NSLog(@"Best host = %@",gameKitHelper.hostingPlayer);
}];

Answer 1

I found a simple solution (instead of generating a random number which requires additional negotiation and data transfer) is to simply compare [[GKLocalPlayer localPlayer] playerID] with the playerIDs in the match and choose the first one ordered ascending. This can be done on all the devices, guarantees a unique playerID as host and guarantees the same unique playerID is chosen on all devices.