iPhone開發應用中關于GameKit藍牙實例講解是本文要介紹的內容，主要是來了解并學習GameKit藍牙實例。介紹一下這個實例實現的是兩個帶有藍牙設備的touch之間的一個小游戲，在界面上有個可以響應事件的UIView（之前說過）可以點擊，然后看誰新達到WINNING_TAP_COUNT （游戲中一常量可以自己設置）誰先達到誰就贏了，然后通知對方。還要引入GameKit.framework框架
頭文件BlueToothViewController.h：

//  
//  
// BlueToothViewController.h  
// BlueTooth  
//  
// Created by mingchun liu on 09-11-24.  
// Copyright sdie 2009. All rights reserved.  
//  
 
#import <UIKit/UIKit.h> 
#import <GameKit/GameKit.h> 
 
#define START_GAME_KEY @"startgame"  
#define END_GAME_KEY @"endgame"  
#define TAP_COUNT_KEY @"taps"  
#define WINNING_TAP_COUNT 50  
 
#define AMIPHD_P2P_SESSION_ID @"amiphdp2p2"//這個是藍牙協議  
 
@interface BlueToothViewController : UIViewController<GKPeerPickerControllerDelegate,GKSessionDelegate>{  
        BOOL actingAsHost;//是否提供服務,客戶端還是服務器端  
        int playerTapCount;//記錄玩家點擊次數  
        int opponentTapCount;//對方點擊次數  
        IBOutlet UILabel *playerTapCountLabel;//顯示玩家點擊次數  
        IBOutlet UILabel *opponentTapCountLabel;//顯示對手點擊次數  
        NSString *opponentID;//對方標識符  
        GKSession *gkSession;  
          
        IBOutlet UILabel *startQuitButton;//開始退出按鈕  
}  
 
@property BOOL actingAsHost;  
@property int playerTapCount;  
@property int opponentTapCount;  
@property (nonatomic,retain) GKSession *gkSession;  
 
@property (nonatomic,retain) NSString *opponentID;  
 
@property (nonatomic,retain)UILabel *playerTapCountLabel;  
@property (nonatomic,retain)UILabel *opponentTapCountLabel;  
 
@property (nonatomic,retain)UILabel *startQuitButton;  
 
-(IBAction) handleStartQuitTapped;//處理開始退出操作  
-(IBAction) handleTapViewTapped;//處理點擊UIView的操作  
-(void) updateTapCountLabels;//更新顯示  
-(void) initGame;//初始化游戲  
-(void) hostGame;  
-(void) joinGame;//加入游戲  
-(void) endGame;//結束游戲  
-(void) showEndGameAlert;//彈出結束游戲對話框  
@end  
 
#import "BlueToothViewController.h"  
 
@implementation BlueToothViewController  
 
@synthesize actingAsHost;  
@synthesize playerTapCount;  
@synthesize opponentID;  
@synthesize playerTapCountLabel;  
@synthesize opponentTapCountLabel;  
 
@synthesize startQuitButton;  
@synthesize gkSession;  
@synthesize opponentTapCount;  
 
-(IBAction) handleStartQuitTapped {//建立鏈接操作,彈出鏈接窗口顯示在線  
        if (! opponentID) {//如果對手ID為空就建立服務端提供服務  
                actingAsHost = YES;  
                GKPeerPickerController *peerPickerController =[[GKPeerPickerController alloc] init];  
                peerPickerController.delegate = self;  
                peerPickerController.connectionTypesMask =  
                GKPeerPickerConnectionTypeNearby;  
                [peerPickerController show];  
        }  
}  
-(IBAction) handleTapViewTapped {//點擊操作  
        playerTapCount++;  
        [self updateTapCountLabels];  
        // did we just win?  
        BOOL playerWins = playerTapCount >= WINNING_TAP_COUNT;//當點擊達到一定次數時  
        // send tap count to peer  
        NSMutableData *message = [[NSMutableData alloc] init];//傳的數據類型為nsdata類型的  
        NSKeyedArchiver *archiver =  
        [[NSKeyedArchiver alloc] initForWritingWithMutableData:message];  
        [archiver encodeInt:playerTapCount forKey: TAP_COUNT_KEY];  
        if (playerWins)  
                [archiver encodeBool:YES forKey:END_GAME_KEY];  
        [archiver finishEncoding];//打包傳數據  
        GKSendDataMode sendMode =  
        playerWins ? GKSendDataReliable : GKSendDataUnreliable;//判斷用可靠的鏈接還是不可靠的鏈接  
        [gkSession sendDataToAllPeers: message withDataMode:sendMode error:NULL];//發送數據  
        [archiver release];  
        [message release];  
        // also end game locally  
        if (playerWins)  
                [self endGame];  
}  
 
-(void) updateTapCountLabels {  
        playerTapCountLabel.text =  
        [NSString stringWithFormat:@"%d", playerTapCount];  
        opponentTapCountLabel.text =  
        [NSString stringWithFormat:@"%d", opponentTapCount];  
}  
-(void) initGame {  
        playerTapCount = 0;  
        opponentTapCount = 0;  
}  
-(void) hostGame {  
        [self initGame];  
        NSMutableData *message = [[NSMutableData alloc] init];  
        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]  
                                                                 initForWritingWithMutableData:message];  
        [archiver encodeBool:YES forKey:START_GAME_KEY];  
        [archiver finishEncoding];  
        NSError *sendErr = nil;  
        [gkSession sendDataToAllPeers: message  
                                         withDataMode:GKSendDataReliable error:&sendErr];  
        if (sendErr)  
                NSLog (@"send greeting failed: %@", sendErr);  
        // change state of startQuitButton  
        startQuitButton.text = @"Quit";  
        [message release];  
        [archiver release];  
        [self updateTapCountLabels];  
}  
-(void) joinGame {  
        [self initGame];  
        startQuitButton.text = @"Quit";  
        [self updateTapCountLabels];  
}  
 
//一下是代理方法  
 
-(GKSession *) peerPickerController: (GKPeerPickerController*) controller  
                  sessionForConnectionType: (GKPeerPickerConnectionType) type {  
        if (!gkSession) {//如果沒有鏈接時建立連接  
                gkSession = [[GKSession alloc]  
                                         initWithSessionID:AMIPHD_P2P_SESSION_ID//根據此值判斷用的是什么鏈接  
                                         displayName:nil//在線用戶名  
                                         sessionMode:GKSessionModePeer];  
                gkSession.delegate = self;  
        }  
        return gkSession;  
}  
 
- (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session  
{//當picker接收到數據后將其釋放掉，否則進入不了界面  
        [picker dismiss];  
        picker.delegate = nil;  
        [picker autorelease];  
}  
- (void)session:(GKSession *)session  
didReceiveConnectionRequestFromPeer:(NSString *)peerID {//已接受連接請求的代理方法  
        actingAsHost = NO;//設為客戶端  
}  
 
- (void)session:(GKSession *)session peer:(NSString *)peerID  
didChangeState:(GKPeerConnectionState)state {//狀態改變時觸發的代理方法  
        switch (state)  
        {  
                case GKPeerStateConnected:  
                        [session setDataReceiveHandler: self withContext: nil];  
                        opponentID = peerID;//改變opponentID的值  
                        actingAsHost ? [self hostGame] : [self joinGame];//  
                        break;  
        }  
}  
 
- (void) receiveData: (NSData*) data fromPeer: (NSString*) peerID  
                   inSession: (GKSession*) session context: (void*) context {//接受數據時的代理操作  
        NSKeyedUnarchiver *unarchiver =  
        [[NSKeyedUnarchiver alloc] initForReadingWithData:data];  
        if ([unarchiver containsValueForKey:TAP_COUNT_KEY]) {  
                opponentTapCount = [unarchiver decodeIntForKey:TAP_COUNT_KEY];  
                [self updateTapCountLabels];  
        }  
        if ([unarchiver containsValueForKey:END_GAME_KEY]) {  
                [self endGame];  
        }  
        if ([unarchiver containsValueForKey:START_GAME_KEY]) {  
                [self joinGame];  
        }  
        [unarchiver release];  
}  
//以上是代理方法  
 
-(void) showEndGameAlert {  
        BOOL playerWins = playerTapCount > opponentTapCount;  
        UIAlertView *endGameAlert = [[UIAlertView alloc]  
                                                                 initWithTitle: playerWins ? @"Victory!" : @"Defeat!"  
                                                                 message: playerWins ? @"Your thumbs have emerged supreme!":  
                                                                 @"Your thumbs have been laid low"  
                                                                 delegate:nil  
                                                                 cancelButtonTitle:@"OK"  
                                                                 otherButtonTitles:nil];  
        [endGameAlert show];  
        [endGameAlert release];  
}  
-(void) endGame {  
        opponentID = nil;  
        startQuitButton.text = @"Find";  
        [gkSession disconnectFromAllPeers];  
        [self showEndGameAlert];  
}  
 
/*  
// The designated initializer. Override to perform setup that is required before the view is loaded.  
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {  
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {  
        // Custom initialization  
    }  
    return self;  
}  
*/  
 
/*  
// Implement loadView to create a view hierarchy programmatically, without using a nib.  
- (void)loadView {  
}  
*/  
 
/*  
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.  
- (void)viewDidLoad {  
    [super viewDidLoad];  
}  
*/  
 
/*  
// Override to allow orientations other than the default portrait orientation.  
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {  
    // Return YES for supported orientations  
    return (interfaceOrientation == UIInterfaceOrientationPortrait);  
}  
*/  
 
- (void)didReceiveMemoryWarning {  
        // Releases the view if it doesn't have a superview.  
    [super didReceiveMemoryWarning];  
          
        // Release any cached data, images, etc that aren't in use.  
}  
 
- (void)viewDidUnload {  
        // Release any retained subviews of the main view.  
        // e.g. self.myOutlet = nil;  
}  
 
- (void)dealloc {  
        [opponentID release];  
        [playerTapCountLabel release];  
        [opponentTapCountLabel release];  
 
 
        [startQuitButton release];  
        [gkSession release];  
    [super dealloc];  
} 

小結：iPhone開發之GameKit藍牙實例講解的內容介紹完 ，希望通過本文的學習能對你有所幫助！