cocos2d-x Game Center

原文出处：http://www.cnblogs.com/jingjingWang/archive/2012/06/07/cocos2d-x.html

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

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//

//  GameKitHelper.h

//  toDefendTheEarth

//

//  Created by jingjing on 12-6-7.

//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.

//

 

#import <UIKit/UIKit.h>

#import <Foundation/Foundation.h>

#import <GameKit/GameKit.h>

 

@interface GameKitHelper :  NSObject <GKLeaderboardViewControllerDelegate, GKAchievementViewControllerDelegate, GKMatchmakerViewControllerDelegate, GKMatchDelegate>{

    BOOLgameCenterAvailable;

    BOOLuserAuthenticated;

}

 

@property (assign, readonly) BOOLgameCenterAvailable;

 

+ (GameKitHelper *)sharedGameKitHelper;

- (void) authenticateLocalUser;

 

- (void) showLeaderboard;

- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController;

 

@end

 

这是实现

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//

//  GameKitHelper.m

//  toDefendTheEarth

//

//  Created by jingjing on 12-6-7.

//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.

//

 

 

#import "GameKitHelper.h"

 

@implementation GameKitHelper

@synthesize gameCenterAvailable;

 

//静态初始化 对外接口

staticGameKitHelper *sharedHelper = nil;

staticUIViewController* currentModalViewController = nil;

+ (GameKitHelper *) sharedGameKitHelper {

    if(!sharedHelper) {

        sharedHelper = [[GameKitHelper alloc] init];

    }

    returnsharedHelper;

}

 

//用于验证

- (BOOL)isGameCenterAvailable {

    // check for presence of GKLocalPlayer API

    Class gcClass = (NSClassFromString(@"GKLocalPlayer"));

     

    // check if the device is running iOS 4.1 or later

    NSString *reqSysVer =@"4.1";

    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];

    BOOLosVersionSupported = ([currSysVer compare:reqSysVer

                                           options:NSNumericSearch] != NSOrderedAscending);

     

    return(gcClass && osVersionSupported);

}

 

- (id)init {

    if((self = [super init])) {

        gameCenterAvailable = [self isGameCenterAvailable];

        if(gameCenterAvailable) {

            NSNotificationCenter *nc =

            [NSNotificationCenter defaultCenter];

            [nc addObserver:self

                   selector:@selector(authenticationChanged)

                       name:GKPlayerAuthenticationDidChangeNotificationName

                     object:nil];

        }

    }

    returnself;

}

 

//后台回调登陆验证

- (void)authenticationChanged {

     

    if([GKLocalPlayer localPlayer].isAuthenticated &&!userAuthenticated) {

        NSLog(@"Authentication changed: player authenticated.");

        userAuthenticated = TRUE;

    }elseif(![GKLocalPlayer localPlayer].isAuthenticated && userAuthenticated) {

        NSLog(@"Authentication changed: player not authenticated");

        userAuthenticated = FALSE;

    }

     

}

 

- (void)authenticateLocalUser {

     

    if(!gameCenterAvailable)return;

     

    NSLog(@"Authenticating local user...");

    if([GKLocalPlayer localPlayer].authenticated == NO) {

        [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:nil];

    }else{

        NSLog(@"Already authenticated!");

    }

}

 

//显示排行榜

- (void) showLeaderboard

{

    if(!gameCenterAvailable)return;

     

    GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init];

    if(leaderboardController != nil) {

        leaderboardController.leaderboardDelegate = self;

         

        UIWindow *window = [[UIApplication sharedApplication] keyWindow];

        currentModalViewController = [[UIViewController alloc] init];

        [window addSubview:currentModalViewController.view];

        [currentModalViewController presentModalViewController:leaderboardController animated:YES];

    }

     

}

 

//关闭排行榜回调

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

    if(currentModalViewController !=nil){

        [currentModalViewController dismissModalViewControllerAnimated:NO];

        [currentModalViewController release];

        [currentModalViewController.view removeFromSuperview];

        currentModalViewController = nil;

    }

}

 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

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#import "GameKitHelper.h"

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

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//GameCenter登陆

[[GameKitHelper sharedGameKitHelper] authenticateLocalUser];

 到此登陆就ok啦。后面来教大家如何显示排行榜界面

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//显示排行榜

[[GameKitHelper sharedGameKitHelper] showLeaderboard];

 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（属性 Build Phases->Link Binary With Libraries  add GameKit.framework）。