blocks|key|2983688|text|您需要一个iPhone开发者帐户来测试和实现游戏中心。你不需要在app+Store上有一个应用程序，你可以在一个未发布的项目上测试它。我建议你阅读下面的教程，它很清楚地解释了关于排行榜的一切：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2983689|Leaderboards+Tutorial|offset|length|2983690|entityMap|0|LINK|mutability|MUTABLE|url|http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-game-center-achievements-and-leaderboards-part-1/^0|0|0|L|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You need an iPhone developer account to test and implement game center. You don't need to have an app on the App Store you can just test it on an unreleased project. I suggest you read the following tutorial, which explains everything about leaderboards pretty clearly:

<a href="http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-game-center-achievements-and-leaderboards-part-1/" rel="nofollow">Leaderboards Tutorial</a>

blocks|key|2983730|text|是的，但是你无论如何都要在设备上进行测试。不，你有一个‘沙盒’版本的游戏中心，游戏不在应用商店/开发版本中进行测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2983731|实现排行榜的难度取决于您使用的cocos2D版本。从经验来看，版本1比版本2更具挑战性，下面是我如何实现它的一些代码；|2983732|-+(void)showLeaderboardForCategory:(NSString+*)category
{

++++++++//+Create+leaderboard+view+w/+default+Game+Center+style
++++++++GKLeaderboardViewController+*leaderboardController+=+[[GKLeaderboardViewController+alloc]+init];

++++++++//+If+view+controller+was+successfully+created...
++++++++if+(leaderboardController+!=+nil)
++++++++{
++++++++++++//+Leaderboard+config
++++++++++++leaderboardController.leaderboardDelegate+=+self;+++//+The+leaderboard+view+controller+will+send+messages+to+this+object
++++++++++++leaderboardController.category+=+category;++//+Set+category+here
++++++++++++leaderboardController.timeScope+=+GKLeaderboardTimeScopeAllTime;++

++++++++++++//+Create+an+additional+UIViewController+to+attach+the+GKLeaderboardViewController+to
++++++++++++myViewController+=+[[UIViewController+alloc]+init];

++++++++++++[[[CCDirector+sharedDirector]+openGLView]+addSubview:myViewController.view];

++++++++++++//+Tell+UIViewController+to+present+the+leaderboard
++++++++++++[myViewController+presentModalViewController:leaderboardController+animated:YES];
++++++++}
}

-+(void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController+*)leaderboardController
{

++++[myViewController+dismissModalViewControllerAnimated:YES];
++++myViewController.view+=+nil;
++++[myViewController+release];

}|code-block|syntax|javascript|2983733|(归功于我最初使用的SO+post+-+Leaderboard+doesn't+add+in+the+screen+cocos2d)|offset|length|2983734|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6724844/leaderboard-doesnt-add-in-the-screen-cocos2d^0|0|0|0|K|19|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Yes - but you would anyway to test on a device. And no, you have a 'sandboxed' version of Game Centre where games not on the app store/ development builds are tested. 

Implementing leader-boards difficulty depends on what version of cocos2D you are using. From experience version 1 is a little more challenging then 2. Here is some code on how I have implemented it;

<pre><code>- (void)showLeaderboardForCategory:(NSString *)category
{

 // Create leaderboard view w/ default Game Center style
 GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init];

 // If view controller was successfully created...
 if (leaderboardController != nil)
 {
 // Leaderboard config
 leaderboardController.leaderboardDelegate = self; // The leaderboard view controller will send messages to this object
 leaderboardController.category = category; // Set category here
 leaderboardController.timeScope = GKLeaderboardTimeScopeAllTime; 

 // Create an additional UIViewController to attach the GKLeaderboardViewController to
 myViewController = [[UIViewController alloc] init];

 [[[CCDirector sharedDirector] openGLView] addSubview:myViewController.view];

 // Tell UIViewController to present the leaderboard
 [myViewController presentModalViewController:leaderboardController animated:YES];
 }
}

- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)leaderboardController
{

 [myViewController dismissModalViewControllerAnimated:YES];
 myViewController.view = nil;
 [myViewController release];

}
</code></pre>

(Credit to the SO post that I originally used though - <a href="https://stackoverflow.com/questions/6724844/leaderboard-doesnt-add-in-the-screen-cocos2d">Leaderboard doesn&#39;t add in the screen cocos2d</a>)

blocks|key|1726775|text|Rod+Strougo和Ray+Wenderlich的书“学习Cocos2d”(2012)为实现游戏中心排行榜和成就提供了一些很好的示例代码。伊特海姆和勒夫的“用iOS5学习cocos2d游戏开发”也给出了很好的例子。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1726776|我遵循了Strougo的例子，它在第一次或多或少起到了作用。但人们被困在(我做过的)是如何测试。如果你做得不对，它看起来就像是不工作，而实际上它是不工作的。听起来您还没有开始使用GC，所以我不会尝试解释该做什么。只需注意，当测试时间到来时，您需要遵循的过程并不是完全显而易见的。|1726777|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The Rod Strougo and Ray Wenderlich book "Learning Cocos2d" (2012) gives some good sample code for implementing game center leaderboards and achievements. Also "Learn cocos2d Game Development with iOS5" by Itterheim and Loew gives good examples too. 

I followed the Strougo examples and it worked more-or-less the first time. But something people get stuck on (I did) is how to test. If you don't do it right it will seem like it isn't working when it actually is. It sounds like you haven't gotten started with GC yet so I won't try to explain what to do. Just be aware when the time comes to test that there is a procedure you need to follow that isn't completely obvious.

Do I need iPhone developer certificate and the app available on the app store in order to implement game center.

Is it easy to implement game center leader boards into your game and if so any tutorials on doing so. I have a score counter already ,but not sure how I would add it into game center.

Any good tutorials on implementing game center into cocos2d and if so may I see a link (yes I have seen some tutorials ,but I want to be recommended a good tutorial).

Game center cocos2d questions

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我是否需要iPhone开发者证书和应用商店上提供的应用程序才能实现游戏中心。在你的游戏中实现游戏中心排行榜很容易吗?如果是的话，有没有这样做的教程。我已经有了一个记分器，但我不确定如何将它添加到游戏中心。关于在cocos2d中实现游戏中心的任何好的教程，如果有的话，我可以看到一个链接(是的，我看过一些教程，但我想推荐一...

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