基于udp的socket编程第三方库，需导入头文件 AsycUdpSocket.h

服务器端：

//1.初始化serversocket

AsyncUdpSocket *serverSocket=[[AsyncUdpSocket alloc]initWithDelegate:self];

//2.绑定端口

[serverSocket bindToPort:0x1234 error:nil];

//3.开始监听

[serverSocket receiveWithTimeout:-1 tag:0];

//4.实现代理方法

- (void)onUdpSocket:(AsyncUdpSocket *)sock didSendDataWithTag:(long)tag{

NSLog(@"服务端---发送数据成功");

}

- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error{

NSLog(@"服务端--发送数据失败");

}

- (BOOL)onUdpSocket:(AsyncUdpSocket *)sock didReceiveData:(NSData *)data withTag:(long)tag fromHost:(NSString *)host port:(UInt16)port{

NSLog(@"服务端--接收到数据--来自%@:%hu  tag:%ld",host,port,tag);

NSString *msg=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"消息是：%@",msg);

//默认收到一次就断开，如果想让一直监听，就在下面让它继续监听

[sock receiveWithTimeout:-1 tag:0];

return YES;

}

- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error{

NSLog(@"服务端--没有接收到数据");

}

- (void)onUdpSocketDidClose:(AsyncUdpSocket *)sock{

NSLog(@"服务端---断开连接");

}

//5.关闭服务端

[serverSocket close];

客户端：

//1.初始化clientsocket

clientSocket=[[AsyncUdpSocket alloc]initWithDelegate:self];

//2.发送消息

NSString *sendMessage=@"这是我发送的消息，哈哈哈哈哈";

NSData *msgData=[sendMessage dataUsingEncoding:NSUTF8StringEncoding];

[clientSocket sendData:msgData toHost:@"192.168.101.182" port:0x1234 withTimeout:5 tag:1];

//3.实现代理方法

- (void)onUdpSocket:(AsyncUdpSocket *)sock didSendDataWithTag:(long)tag{

NSLog(@"客户端---发送数据成功");

}

- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error{

NSLog(@"客户端--发送数据失败");

}

- (BOOL)onUdpSocket:(AsyncUdpSocket *)sock didReceiveData:(NSData *)data withTag:(long)tag fromHost:(NSString *)host port:(UInt16)port{

NSLog(@"客户端--接收到数据--来自%@:%hu",host,port);

return YES;

}

- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error{

NSLog(@"客户端--没有接收到数据");

}

- (void)onUdpSocketDidClose:(AsyncUdpSocket *)sock{

NSLog(@"客户端---断开连接");

}