gamekitlisted
Install: claude install-skill thiennc-tesoglobal/ios-skills
# GameKit
Use GameKit for Game Center authentication, competition, matchmaking, social
surfaces, and saved-game handoffs; keep rendering, board logic, and full
SharePlay group-activity design in their owning framework skills.
## Contents
- [Authentication](#authentication)
- [Access Point](#access-point)
- [Dashboard](#dashboard)
- [Leaderboards](#leaderboards)
- [Achievements](#achievements)
- [Real-Time Multiplayer](#real-time-multiplayer)
- [Turn-Based Multiplayer](#turn-based-multiplayer)
- [Common Mistakes](#common-mistakes)
- [Review Checklist](#review-checklist)
- [References](#references)
## Authentication
All GameKit features require the local player to authenticate first. Set the
`authenticateHandler` on `GKLocalPlayer.local` early in the app lifecycle.
GameKit calls the handler multiple times during initialization.
```swift
import GameKit
func authenticatePlayer() {
GKLocalPlayer.local.authenticateHandler = { viewController, error in
if let viewController {
// Present so the player can sign in or create an account.
present(viewController, animated: true)
return
}
if let error {
// Player could not sign in. Disable Game Center features.
disableGameCenter()
return
}
// Player authenticated. Check restrictions before starting.
let player = GKLocalPlayer.local
if player.isUnderage {
hideExplicitContent()
}