UDP通信（AsyncSocket）

接收端

1.初始化接收端socket對象

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

2.綁定端口

 [receiveSocket bindToPort:6478 error:nil];

3.監聽接收數據

[receiveSocket receiveWithTimeout:-1 tag:10];

發送端

1.初始化發送端socket對象

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

//發送數據

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

//協議方法

#pragma  mark - AsyncUdpSocketDelegate

//發送數據成功

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

{

    NSLog(@"發送數據成功!");

}

//接收數據成功

//sock:接收端的socket

//data:接收到的數據

//tag:tag值

//fromHost:發送端的主機ip

//port:端口

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

{

    //接收到的內容

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

    

 //繼續監聽接收數據(監聽一次)

    [receiveSocket receiveWithTimeout:-1 tag:10];

    return YES;

}