I'm building a game with a client-server architecture. Using GKMatch.chooseBestHostingPlayer(_:) rarely works. When I started testing it today, it worked once at the very beginning, and since then it always succeeds on one client and returns nil on the other client. I'm testing with a Mac and an iPhone. Sometimes it fails on the Mac, sometimes on the iPhone. On the device that it succeeds on, the provided host can be the device itself or the other one.
I created FB9583628 in August 2021, but after the Feedback Assistant team replied that they are not able to reproduce it, the feedback never went forward.
import SceneKit
import GameKit
#if os(macOS)
typealias ViewController = NSViewController
#else
typealias ViewController = UIViewController
#endif
class GameViewController: ViewController, GKMatchmakerViewControllerDelegate, GKMatchDelegate {
var match: GKMatch?
var matchStarted = false
override func viewDidLoad() {
super.viewDidLoad()
GKLocalPlayer.local.authenticateHandler = authenticate
}
private func authenticate(_ viewController: ViewController?, _ error: Error?) {
#if os(macOS)
if let viewController = viewController {
presentAsSheet(viewController)
} else if let error = error {
print(error)
} else {
print("authenticated as \(GKLocalPlayer.local.gamePlayerID)")
let viewController = GKMatchmakerViewController(matchRequest: defaultMatchRequest())!
viewController.matchmakerDelegate = self
GKDialogController.shared().present(viewController)
}
#else
if let viewController = viewController {
present(viewController, animated: true)
} else if let error = error {
print(error)
} else {
print("authenticated as \(GKLocalPlayer.local.gamePlayerID)")
let viewController = GKMatchmakerViewController(matchRequest: defaultMatchRequest())!
viewController.matchmakerDelegate = self
present(viewController, animated: true)
}
#endif
}
private func defaultMatchRequest() -> GKMatchRequest {
let request = GKMatchRequest()
request.minPlayers = 2
request.maxPlayers = 2
request.defaultNumberOfPlayers = 2
request.inviteMessage = "Ciao!"
return request
}
func matchmakerViewControllerWasCancelled(_ viewController: GKMatchmakerViewController) {
print("cancelled")
}
func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFailWithError error: Error) {
print(error)
}
func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFind match: GKMatch) {
self.match = match
match.delegate = self
startMatch()
}
func match(_ match: GKMatch, player: GKPlayer, didChange state: GKPlayerConnectionState) {
print("\(player.gamePlayerID) changed state to \(String(describing: state))")
startMatch()
}
func startMatch() {
let match = match!
if matchStarted || match.expectedPlayerCount > 0 {
return
}
print("starting match with local player \(GKLocalPlayer.local.gamePlayerID) and remote players \(match.players.map({ $0.gamePlayerID }))")
match.chooseBestHostingPlayer { host in
print("host is \(String(describing: host?.gamePlayerID))")
}
}
}
