步骤：
1. 在iTunes Connect中启用Game Center。
2. 配置程序的Bundle identifier
3. 导入Game Kit Framework
4. 导入头文件<GameKit/GameKit.h>
5. 检测当前设备是否支持Game Center
6. 对于不支持Game Center的设备，对Game Kit Framework的引用应改为‘弱引用’（weak link）。
7. 程序启动后，认证用户。
一、iTunes Connect的配置
iTunes Connect Developer Guide
https://itunesconnect.apple.com/docs/iTunesConnect_DeveloperGuide.pdf/
二、配置程序的Bundle identifier
com.myCompany.myCoolGame 与 iTunes Connect中配置相同
三、添加FrameWork （weak－link）检测当前设备是否支持Game Center
Target->’Get info’ ->’Genaral’ Linkd libray -> 将Required改为Weak
BOOL isGameCenterAvailable()
{
// Check for presence of GKLocalPlayer API.
Class gcClass = (NSClassFromString(@”GKLocalPlayer”));
// The device must be running running iOS 4.1 or later.
NSString *reqSysVer = @”4.1″;
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
BOOL osVersionSupported = ([currSysVer compare:reqSysVer
options:NSNumericSearch] != NSOrderedAscending);
return (gcClass && osVersionSupported);
}
四、认证用户
用户必须具有账户才可以访问Game center。程序启动或在需要调用Game Center功能的地方，认证当前的使用账户。
- (void) authenticateLocalUser
{
if([GKLocalPlayer localPlayer].authenticated == NO)
{
[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error)
{
if(error == nil)
{
//认证成功
}
else
{
//失败
UIAlertView* alert= [[[UIAlertView alloc] initWithTitle: @”Game Center Account Required”
message: [NSString stringWithFormat: @"Reason: %@", [error localizedDescription]]
delegate: self cancelButtonTitle: @”Try Again…” otherButtonTitles: NULL] autorelease];
[alert show];
}
}
];
}
}
五、排行榜功能
5.1 在iTunes Connect中配置排行榜
（得分格式、排行榜分类）等
5.2 将得分发送到Game Center
- (void) reportScore: (int64_t) score forCategory: (NSString*) category
{
GKScore *scoreReporter = [[[GKScore alloc] initWithCategory:category] autorelease];
scoreReporter.value = score;
[scoreReporter reportScoreWithCompletionHandler: ^(NSError *error)
{
if(error != nil)
{
//处理储物
}
else
{
//显示排行榜
}
}];
}
5.3 显示排行榜（LeaderboardController）
- (void) showLeaderboard
{
GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init];
if (leaderboardController != nil) {
leaderboardController.leaderboardDelegate = self;
[self presentModalViewController: leaderboardController animated: YES];
}
}
在显示leaderboard之前，可以配置leaderboard view Controller的一些属性。（category 属性，配置显示哪中分类下的排行榜；timeScope属性，配置显示哪个时间段内的排行榜)
//响应用户关闭排行榜的事件：
-(void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
[self dismissModalViewControllerAnimated:YES];
}
5.4 获取排行榜数据，自定义排行榜显示的view
//获取所有用户
- (void) retrieveTopTenScores
{
GKLeaderboard *leaderboardRequest = [GKLeaderboard alloc] init];
if (leaderboardRequest != nil) {
leaderboardRequest.playerScope = GKLeaderboardPlayerScopeGlobal;
leaderboardRequest.timeScope = GKLeaderboardTimeScopeAllTime;
leaderboardRequest.range = NSMakeRange(1,10);
[leaderboardRequest loadScoresWithCompletionHandler: ^(NSArray *scores, NSError *error) {
if (error != nil)
// handle the error.
if (scores != nil)
// process the score information.
}];
}
//获取特定用户的排行榜数据
- (void) receiveMatchBestScores: (GKMatch*) match
{
GKLeaderboard *query = [GKLeaderboard alloc] initWithPlayers: match.players];
if (query != nil)
{
[query loadScoresWithCompletionHandler: ^(NSArray *scores, NSError *error) {
}
if (error != nil) // handle the error.
if (scores != nil) // process the score information.
}];
}
六、Cocos2d 中加入 Game Center
6.1 方式1 （直接获取数据、自定义排行榜的view）
6。2 0.99.5 sdk of cocos2d have a RootViewController
6.3 方式3 使用viewcontroller
创建一个viewcontroller 将其view属性添加到cocos2d的 glview
UIViewController *tempVC=[[UIViewController alloc] init];
GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease];
request.minPlayers = 2;
request.maxPlayers = 2;
request.playersToInvite = playersToInvite;
GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];
mmvc.matchmakerDelegate = self;
[[[CCDirector sharedDirector] openGLView] addSubview:tempVC.view];
[tempVC presentModalViewController:mmvc animated:YES];
//响应事件
-(void)matchmakerViewControllerWasCancelled:(GKMatchmakerViewController *)viewController
{
[tempVC dismissModalViewControllerAnimated:YES];
[tempVC.view removeFromSuperview];
}
//退出时
-(void) onExit
{
[super onExit];
[tempVC release];
}
- (void) showLeaderboard
{
GKLeaderboardViewController *leaderboardController = [[[GKLeaderboardViewController alloc] init] autorelease];
if (leaderboardController != nil)
{
leaderboardController.leaderboardDelegate = self;
[[[CCDirector sharedDirector] openGLView] addSubview:tempVC.view];
[tempVC presentModalViewController:leaderboardController animated: YES];
}
}
- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
[tempVC dismissModalViewControllerAnimated:YES];
[tempVC.view removeFromSuperview];
}