UDP通信（AsyncSocket）

接收端

1.初始化接收端socket对象

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

2.绑定端口

 [receiveSocket bindToPort:6478 error:nil];

3.监听接收数据

[receiveSocket receiveWithTimeout:-1 tag:10];

发送端

1.初始化发送端socket对象

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

//发送数据

    [sendSocket sendData:data toHost:ipTF.text port:6478 withTimeout:-1 tag:100];

//协议方法

#pragma  mark - AsyncUdpSocketDelegate

//发送数据成功

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

{

    NSLog(@"发送数据成功!");

}

//接收数据成功

//sock:接收端的socket

//data:接收到的数据

//tag:tag值

//fromHost:发送端的主机ip

//port:端口

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

{

    //接收到的内容

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

    

 //继续监听接收数据(监听一次)

    [receiveSocket receiveWithTimeout:-1 tag:10];

    return YES;

}