我是使用unity自带的Social.localUser方法调用的，其中也遇到一些问题,比如：在ios设备上没有反映，刚开始感觉这个脚本出问题。然后使用第三方插件，也是不能登录, 查看源码，打印错误日志。

最后才发现必须开启gameCenter的沙盒模式 Sandbox in Settings--> Game Center --> Sandbox.   错误提示为：

Domain=GKErrorDomain Code=15 "The requested operation could not be completed because this application is not recognized by Game Center." UserInfo=0x17d08ee0 {NSLocalizedDescription=The requested operation could not be completed because this application is not recognized by Game Center.

大功告成把Unity脚本也和大家分享下：

using UnityEngine;
using UnityEngine.SocialPlatforms;
using UnityEngine.SocialPlatforms.GameCenter;public class GameCenterManager : System.Object
{private static GameCenterManager instance;private static object _lock=new object();private GameCenterManager(){}public static GameCenterManager GetInstance(){if(instance==null){lock(_lock){if(instance==null){instance=new GameCenterManager();}}}return instance;}public void Start(){Social.localUser.Authenticate(HandleAuthenticated);}private void HandleAuthenticated(bool success){Debug.Log("*** HandleAuthenticated: success = " + success);if(success){string userInfo = "UserName:" + Social.localUser.userName +"\nUser ID:"+Social.localUser.id + " \nIsUnderage: "+ Social.localUser.underage;Debug.Log(userInfo);//下面三行看个人需要，需要什么信息就取什么信息，这里注释掉是因为担心有的朋友没有在iTunesConnect里设置排行、成就之类的东西，运行起来可能会报错//    Social.localUser.LoadFriends(HandleFriendsLoaded);//    Social.LoadAchievements(HandleAchievementsLoaded);//    Social.LoadAchievementDescriptions(HandleAchievementDescriptionsLoaded);}}private void HandleFriendsLoaded(bool success){Debug.Log("*** HandleFriendsLoaded: success = " + success);foreach(IUserProfile friend in Social.localUser.friends){Debug.Log("* friend = " + friend.ToString());}}private void HandleAchievementsLoaded(IAchievement[] achievements){Debug.Log("* HandleAchievementsLoaded");foreach(IAchievement achievement in achievements){Debug.Log("* achievement = " + achievement.ToString());}}private void HandleAchievementDescriptionsLoaded(IAchievementDescription[] achievementDescriptions){Debug.Log("*** HandleAchievementDescriptionsLoaded");foreach(IAchievementDescription achievementDescription in achievementDescriptions){Debug.Log("* achievementDescription = " + achievementDescription.ToString());}}// achievementspublic void ReportProgress(string achievementId, double progress){if (Social.localUser.authenticated) {Social.ReportProgress(achievementId, progress, HandleProgressReported);}}private void HandleProgressReported(bool success){Debug.Log("*** HandleProgressReported: success = " + success);}public void ShowAchievements(){if (Social.localUser.authenticated) {Social.ShowAchievementsUI();}}// leaderboardpublic void ReportScore(string leaderboardId, long score){if (Social.localUser.authenticated) {Social.ReportScore(score, leaderboardId, HandleScoreReported);}}public void HandleScoreReported(bool success){Debug.Log("*** HandleScoreReported: success = " + success);}public void ShowLeaderboard(){if (Social.localUser.authenticated) {Social.ShowLeaderboardUI();}}}