Cocos2d-X 添加 Game Center 的方法

写这篇文章的主要用于给自己加强印象，帮助他人就是帮助自己.

本教程基于cocos2d-x 13版本编写 主要内容是告诉大家在c++中如何添加 game center ，找了很多网络上面的代码基本上都是缺胳膊少腿的，代码不完整，对于初学者来说是痛苦的。

本代码仅提供如何登陆GameCenter 显示和关闭Leaderboard(排行榜)。其他实现请参考子龙山人的博客，顺便贴下地址

http://www.cnblogs.com/zilongshanren/archive/2011/06/24/2088383.html 他讲解了很多东西。如何激活GameCenter等值得学习的文章。写的很细致哦废话不说上贴上代码咯

我这里主要如何使用UIViewController 来实现GameCenter的呈现

1. //
   
2. //  GameKitHelper.h
   
3. //  toDefendTheEarth
   
4. //
   
5. //  Created by jingjing on 12-6-7.
   
6. //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
   
7. //
   
8. 
   
9. #import <UIKit/UIKit.h>
   
10. #import <Foundation/Foundation.h>
    
11. #import <GameKit/GameKit.h>
    
12. 
    
13. @interface GameKitHelper :  NSObject <GKLeaderboardViewControllerDelegate, GKAchievementViewControllerDelegate, GKMatchmakerViewControllerDelegate, GKMatchDelegate>{
    
14.     BOOL gameCenterAvailable;
    
15.     BOOL userAuthenticated;
    
16. }
    
17. 
    
18. @property (assign, readonly) BOOL gameCenterAvailable;
    
19. 
    
20. + (GameKitHelper *)sharedGameKitHelper;
    
21. - (void) authenticateLocalUser;
    
22. 
    
23. - (void) showLeaderboard;
    
24. - (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController;
    
25. 
    
26. @end

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这是实现

1. //
   
2. //  GameKitHelper.m
   
3. //  toDefendTheEarth
   
4. //
   
5. //  Created by jingjing on 12-6-7.
   
6. //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
   
7. //
   
8. 
   
9. 
   
10. #import "GameKitHelper.h"
    
11. 
    
12. @implementation GameKitHelper
    
13. @synthesize gameCenterAvailable;
    
14. 
    
15. //静态初始化 对外接口
    
16. static GameKitHelper *sharedHelper = nil;
    
17. static UIViewController* currentModalViewController = nil;
    
18. + (GameKitHelper *) sharedGameKitHelper {
    
19.     if (!sharedHelper) {
    
20.         sharedHelper = [[GameKitHelper alloc] init];
    
21.     }
    
22.     return sharedHelper;
    
23. }
    
24. 
    
25. //用于验证
    
26. - (BOOL)isGameCenterAvailable {
    
27.     // check for presence of GKLocalPlayer API
    
28.     Class gcClass = (NSClassFromString(@"GKLocalPlayer"));
    
29.    
    
30.     // check if the device is running iOS 4.1 or later
    
31.     NSString *reqSysVer =@"4.1";
    
32.     NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
    
33.     BOOL osVersionSupported = ([currSysVer compare:reqSysVer
    
34.                                            options:NSNumericSearch] != NSOrderedAscending);
    
35.    
    
36.     return (gcClass && osVersionSupported);
    
37. }
    
38. 
    
39. - (id)init {
    
40.     if ((self = [super init])) {
    
41.         gameCenterAvailable = [self isGameCenterAvailable];
    
42.         if (gameCenterAvailable) {
    
43.             NSNotificationCenter *nc =
    
44.             [NSNotificationCenter defaultCenter];
    
45.             [nc addObserver:self
    
46.                    selector:@selector(authenticationChanged)
    
47.                        name:GKPlayerAuthenticationDidChangeNotificationName
    
48.                      object:nil];
    
49.         }
    
50.     }
    
51.     return self;
    
52. }
    
53. 
    
54. //后台回调登陆验证
    
55. - (void)authenticationChanged {
    
56.    
    
57.     if ([GKLocalPlayer localPlayer].isAuthenticated &&!userAuthenticated) {
    
58.         NSLog(@"Authentication changed: player authenticated.");
    
59.         userAuthenticated = TRUE;
    
60.     } else if (![GKLocalPlayer localPlayer].isAuthenticated && userAuthenticated) {
    
61.         NSLog(@"Authentication changed: player not authenticated");
    
62.         userAuthenticated = FALSE;
    
63.     }
    
64.    
    
65. }
    
66. 
    
67. - (void)authenticateLocalUser {
    
68.    
    
69.     if (!gameCenterAvailable) return;
    
70.    
    
71.     NSLog(@"Authenticating local user...");
    
72.     if ([GKLocalPlayer localPlayer].authenticated == NO) {
    
73.         [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:nil];
    
74.     } else {
    
75.         NSLog(@"Already authenticated!");
    
76.     }
    
77. }
    
78. 
    
79. //显示排行榜
    
80. - (void) showLeaderboard
    
81. {
    
82.     if (!gameCenterAvailable) return;
    
83.    
    
84.     GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init];
    
85.     if (leaderboardController != nil) {
    
86.         leaderboardController.leaderboardDelegate = self;
    
87.        
    
88.         UIWindow *window = [[UIApplication sharedApplication] keyWindow];
    
89.         currentModalViewController = [[UIViewController alloc] init];
    
90.         [window addSubview:currentModalViewController.view];
    
91.         [currentModalViewController presentModalViewController:leaderboardController animated:YES];
    
92.     }
    
93.    
    
94. }
    
95. 
    
96. //关闭排行榜回调
    
97. - (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController{
    
98.     if(currentModalViewController !=nil){
    
99.         [currentModalViewController dismissModalViewControllerAnimated:NO];
    
100.         [currentModalViewController release];
     
101.         [currentModalViewController.view removeFromSuperview];
     
102.         currentModalViewController = nil;
     
103.     }
     
104. }

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好了。这个来说下如何调用它们吧。

先把AppDelegate.cpp 后缀修改为mm

在AppDelegate.mm里引入

1. #import "GameKitHelper.h"

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在 applicationDidFinishLaunching方法里调用，代码写在运行场景之前即可

1. //GameCenter登陆
   
2. [[GameKitHelper sharedGameKitHelper] authenticateLocalUser];

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到此登陆就ok啦。后面来教大家如何显示排行榜界面

1. //显示排行榜
   
2. [[GameKitHelper sharedGameKitHelper] showLeaderboard];

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只要把此代码写在你想要调用的方法中就可以了。别忘记了在调用类中引用头文件哦。。

忘记说了。更新一下。。这里需要添加一个 GmaeKit.framework的框架引用。