IM及时聊天-1

   简单的记录一下,两份基本相同的代码,实现了从一个模拟器向另一个模拟器发送消息;

   主要的逻辑是:A模拟器开启了1024端口,然后A向1025端口发送消息;B模拟器开启了1025端口,然后B模拟器向1024端口发送消息
A模拟器:

 

#import "GCDAsyncUdpSocket.h

引入代理 GCDAsyncUdpSocketDelegate

@property (strong, nonatomic) GCDAsyncUdpSocket *sendSocket;//发送socket

@property (strong, nonatomic) GCDAsyncUdpSocket *recvSocket;//接收socket

 //用来发送数据

_recvSocket = [[GCDAsyncUdpSocket      alloc]initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

    [_recvSocket bindToPort:1024 error:nil];

    //在这里接收的套接字需要开启一个接收消息的监听如下：

    if (![_recvSocket beginReceiving:nil]) {

        [_recvSocket close];

        NSLog(@"Error starting server");

        return;

    }

   //用来发送数据

_sendSocket = [[GCDAsyncUdpSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

 //这个是一个点击事件,点击发送消息

- (void)sendUDPTouched

{

    //向目标IP发送消息

    NSString *sengStr = [NSString stringWithFormat:@"发来消息"];

 [_sendSocket sendData:[sengStr dataUsingEncoding:NSUTF8StringEncoding] toHost:@"10.8.20.177" port:1025 withTimeout:-1 tag:1];

}

//接受消息的代理(最后收到消息的话会执行这个方法)

-(void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext

{

 NSLog(@"Message didReceiveData :%@", [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);

}

B模拟器:将端口换了一下