I have implemented the Game Center for authentication and saving player's game data. Both authentication and saving player's data works correctly all the time, but there is a problem with fetching and loading the data.
The game works like this:
At the startup, I start the authentication
After the player successfully logs in, I start loading the player's data by calling fetchSavedGames method
If a game data exists for the player, I receive a list of SavedGame object containing the player's data
The problem is that after I uninstall the game and install it again, sometimes the SavedGame list is empty(step 3). But if I don't uninstall the game and reopen the game, this process works fine.
Here's the complete code of Game Center implementation:
class GameCenterHandler {
public func signIn() {
GKLocalPlayer.local.authenticateHandler = { viewController, error in
if let viewController = viewController {
viewController.present(viewController, animated: false)
return
}
if error != nil {
// Player could not be authenticated.
// Disable Game Center in the game.
return
}
// Auth successfull
self.load(filename: "TestFileName")
}
}
public func save(filename: String, data: String) {
if GKLocalPlayer.local.isAuthenticated {
GKLocalPlayer.local.saveGameData(Data(data.utf8), withName: filename) { savedGame, error in
if savedGame != nil {
// Data saved successfully
}
if error != nil {
// Error in saving game data!
}
}
} else {
// Error in saving game data! User is not authenticated"
}
}
public func load(filename: String) {
if GKLocalPlayer.local.isAuthenticated {
GKLocalPlayer.local.fetchSavedGames { games, error in
if let game = games?.first(where: {$0.name == filename}){
game.loadData { data, error in
if data != nil {
// Data loaded successfully
}
if error != nil {
// Error in loading game data!
}
}
} else {
// Error in loading game data! Filename not found
}
}
} else {
// Error in loading game data! User is not authenticated
}
}
}
I have also added Game Center and iCloud capabilities in xcode. Also in the iCloud section, I selected the iCloud Documents and added a container.
I found a simillar question here but it doesn't make things clearer.
