iOS  UDP 广播 AsyncSocket 用法

因为业务需要，需要用广播发送一个字段，在iOS开发中，用到了AsynSocket。

1.定义一个属性，负责发送和接受数据

@property(nonatomic,strong)AsyncUdpSocket *sendSocket;

2.在viewDidload上初始化这个socket

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

//需要有这个初始化，不知道为什么

[self.sendSocket bindToAddress:@"0.0.0.0" port:5666 error:nil];

[self.sendSocket receiveWithTimeout:-1 tag:0];

3.在需要的时候出发它，我这里是在button点击事件出发的

NSString *sendString=@"HF-A11ASSISTHREAD";
NSData *data=[sendString dataUsingEncoding:NSUTF8StringEncoding];
[self.sendSocket sendData:data toHost:YX_Local_Host port:YX_Lockl_Port withTimeout:30 tag:0];

[self.sendSocket enableBroadcast:YES error:nil];

4.发送出去以后，使用AsyncUdpSocket的代理，接受数据，并对需要的数据进行处理。

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

NSString *receiveData=[[NSString alloc ]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"-----receiveData----%@---------",receiveData);
[self.sendSocket receiveWithTimeout:-1 tag:0];

return YES;

}
- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error{
NSLog(@"没有收到");

}