ios GameKit 实例（点对点通信）

#import "AppDelegate.h"

#import <GameKit/GameKit.h>

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    

    

    m_button1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 200, 40)];

    m_button2 = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 200, 40)];

    m_label1 = [[UILabel alloc]initWithFrame:CGRectMake(100, 0, 200, 40)];

    m_label2 = [[UILabel alloc]initWithFrame:CGRectMake(100, 300, 200, 40)];

    m_label3 = [[UILabel alloc]initWithFrame:CGRectMake(100, 400, 200, 40)];

    

    

    m_button1.backgroundColor = [UIColor blueColor];

    m_button2.backgroundColor = [UIColor blueColor];

    

    [m_button1 setTitle:@"点击" forState:UIControlStateNormal];

    [m_button2 setTitle:@"连接" forState:UIControlStateNormal];

    

    [m_button1 setEnabled:NO];

    [m_button2 setEnabled:YES];

    

    [m_button2 addTarget:self action:@selector(connection) forControlEvents:UIControlEventTouchDown];

    [m_button2 addTarget:self action:@selector(connection) forControlEvents:UIControlEventTouchDown];

    

    [self.window addSubview:m_button1];

    [self.window addSubview:m_button2];

    [self.window addSubview:m_label1];

    [self.window addSubview:m_label2];

    [self.window addSubview:m_label3];

    

    int count = [m_label1.text intValue];

    m_label1.text = [NSString stringWithFormat:@"%i",++count];

    NSString *send = [NSString stringWithFormat:@"{\"code\":%i,\"count\":%i}",1,count];

    NSData *data= [send dataUsingEncoding:NSUTF8StringEncoding];

    if(_session)

    {

        [_session sendDataToAllPeers:data withDataMode:GKSendDataReliable error:nil];

    }

    return YES;

}

-(void)connection

{

    _peerpick = [[GKPeerPickerController alloc]init];

    _peerpick.delegate =self;

    _peerpick.connectionTypesMask = GKPeerPickerConnectionTypeNearby;

    [_peerpick show];

}

-(void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session

{

    NSLog(@"建立连接");

    _session = session;

    _session.delegate = self;

    [_session setDataReceiveHandler:self withContext:Nil];

    _peerpick.delegate = nil;

    [_peerpick dismiss];

    [m_button2 setEnabled:YES];

    [m_button2 setTitle:@"断开连接" forState:UIControlStateNormal];

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(upda) userInfo:nil repeats:YES];

    

    

}

ps：由于缺少实验环境，所以代码有问题主要功能在peerPickerController 和connection中