Incoming GameCenter invite contains no players - ios

Question

I’m trying to get my game to allow 1 device (iPhone) to use GameCenter to invite a friend to play (iPad). I’m using the standard/default MatchMaker interface. The iPhone sends the invitation to the iPad which presents a notification.
When I press this notification the iPad’s ‘player(GKPlayer, didAccept: GKInvite)’ routine DOES get called.
#objc func player(_ playerMe: GKPlayer, didAccept invite: GKInvite) {
print("\n\n\t\tplayer \(playerMe.displayName)(\(playerMe.playerID)) did accept INVITE sent by \(invite.sender.displayName)(\(invite.sender.playerID))")
GKMatchmaker.shared().match(for: invite, completionHandler: {(InvitedMatch, error) in
print("\t\tplayers.count = \(InvitedMatch!.players.count)")
if error != nil {
print("INVITE ERROR: \(error.debugDescription)")
}
if InvitedMatch != nil {
print("\t\tSetting current match. (\(InvitedMatch.debugDescription))")
self.currentMatch = InvitedMatch
self.currentMatch?.delegate = self
// self.prepareMatch()
}
})
}
Output:
player Me(G:25139341913) did accept INVITE sent by ‎“-----”(G:12453976)
players.count = 0
Setting current match. (Optional(<GKMatch 0x282d39970 expected count: 1 seqnum: 0
G:12453976:unknown
reinvitedPlayers:(
)>))
The players array is EMPTY! Shouldn’t it at least have the inviter in there? The ‘expectedPlayerCount’ properly reflects 2 person matchRequest where 1 player (the inviter) is already a participant)
At no point was the ‘player(GKPlayer, didRequestMatchWithRecipients: [GKPlayer])’ called by either end.
So the iPad doesn’t have access to the players to setup the match, but the iPhone sees that the invitation was accepted, has 2 players, and moves on. The iPhone code:
func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFind match: GKMatch) {
print("\n\n\t\tMATCH FOUND\n\n")
viewController.dismiss(animated: true, completion: nil)
GKMatchmaker.shared().stopBrowsingForNearbyPlayers()
currentMatch = match
match.delegate = self
if Globals.gameState?.currentState is StateWaitingForMatch {
if currentMatch?.expectedPlayerCount == 0 {
prepareMatch()
}
}
}
So how do I get the iPad (recipient of the invitation) to see/include the players?

Answer 1

In the player(GKPlayer, invite: GKInvite) method create a GKMatchMakerViewController via
let mmvc = GKMatchmakerViewController(invite: invite!)
and then present it:
viewController.present(mmvc!, animated: true, completion: nil)