cocos2d-x 添加 Game Center 游戲中心的方法

寫這篇文章的主要用於給自己加強印象，幫助他人就是幫助自己.

本教程基於cocos2d-x 13版本編寫 主要內容是告訴大家在c++中如何添加 game center ，找了很多網絡上面的代碼基本上都是缺胳膊少腿的，代碼不完整，對於初學者來說是痛苦的。

本代碼僅提供如何登陸GameCenter 顯示和關閉Leaderboard(排行榜)。其他實現請參考子龍山人的博客，順便貼下地址

http://www.cnblogs.com/zilongshanren/archive/2011/06/24/2088383.html 他講解了很多東西。如何激活GameCenter等值得學習的文章。寫的很細致哦

廢話不說上貼上代碼咯

我這里主要如何使用UIViewController 來實現GameCenter的呈現

//
//  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>{
    BOOL gameCenterAvailable;
    BOOL userAuthenticated;
}

@property (assign, readonly) BOOL gameCenterAvailable;

+ (GameKitHelper *)sharedGameKitHelper;
- (void) authenticateLocalUser;

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

@end

 

這是實現

//
//  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;

//靜態初始化 對外接口
static GameKitHelper *sharedHelper = nil;
static UIViewController* currentModalViewController = nil;
+ (GameKitHelper *) sharedGameKitHelper {
    if (!sharedHelper) {
        sharedHelper = [[GameKitHelper alloc] init];
    }
    return sharedHelper;
}

//用於驗證
- (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];
    BOOL osVersionSupported = ([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];
        }
    }
    return self;
}

//后台回調登陸驗證
- (void)authenticationChanged { 
    
    if ([GKLocalPlayer localPlayer].isAuthenticated &&!userAuthenticated) {
        NSLog(@"Authentication changed: player authenticated.");
        userAuthenticated = TRUE; 
    } else if (![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!");
    }
}

//顯示排行榜
- (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];
    }
    
}

//關閉排行榜回調
- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController{
    if(currentModalViewController !=nil){
        [currentModalViewController dismissModalViewControllerAnimated:NO];
        [currentModalViewController release];
        [currentModalViewController.view removeFromSuperview];
        currentModalViewController = nil;
    }
}

 好了。這個來說下如何調用它們吧。

先把AppDelegate.cpp 后綴修改為mm

在AppDelegate.mm里引入

#import "GameKitHelper.h"

 在 applicationDidFinishLaunching方法里調用，代碼寫在運行場景之前即可

//GameCenter登陸
[[GameKitHelper sharedGameKitHelper] authenticateLocalUser];

 到此登陸就ok啦。后面來教大家如何顯示排行榜界面

//顯示排行榜
[[GameKitHelper sharedGameKitHelper] showLeaderboard];

 只要把此代碼寫在你想要調用的方法中就可以了。別忘記了在調用類中引用頭文件哦。。

忘記說了。更新一下。。這里需要添加一個 GmaeKit.framework的框架引用。

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