说明：只是对GCDAsyncUdpSocket进行简单的使用，实现消息的收发。
1.导入
#import "GCDAsyncUdpSocket.h"
2.创建全局变量
//这个socket用来做发送使用 当然也可以接收
GCDAsyncUdpSocket *sendUdpSocket;
3.创建单例
static UDPManage *myUDPManage = nil;
+(instancetype)shareUDPManage{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
myUDPManage = [[UDPManage alloc]init];
[myUDPManage createClientUdpSocket];
});
return myUDPManage;
}
#pragma mark -- 创建socket
-(void)createClientUdpSocket{
//1.创建一个 udp socket用来和服务器端进行通讯
sendUdpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
//2.banding一个端口(可选),如果不绑定端口, 那么就会随机产生一个随机的电脑唯一的端口
//端口数字范围(1024,2^16-1)
NSError * error = nil;
[sendUdpSocket bindToPort:8085 error:&error];
//启用广播
[sendUdpSocket enableBroadcast:YES error:&error];
if (error) {//监听错误打印错误信息
NSLog(@"error:%@",error);
}else {//监听成功则开始接收信息
[sendUdpSocket beginReceiving:&error];
}
}
5.发送消息
-(void)startScan{
NSString *s = @"mapleTest";
NSData *data = [s dataUsingEncoding:NSUTF8StringEncoding];
NSString *host = @"255.255.255.255";//此处如果写成固定的IP就是对特定的server监测；我这种写法是为了多方监测
uint16_t port = 36877;//通过端口监测
[sendUdpSocket sendData:data toHost:host port:port withTimeout:-1 tag:100];
}
6.相关的代理
#pragma mark -GCDAsyncUdpSocketDelegate
-(void)udpSocket:(GCDAsyncUdpSocket *)sock didSendDataWithTag:(long)tag{
if (tag == 100) {
//NSLog(@"表示标记为100的数据发送完成了");
}
}
-(void)udpSocket:(GCDAsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error{
NSLog(@"标记为tag %ld的发送失败 失败原因 %@",tag, error);
}
-(void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext{
NSString *ip = [GCDAsyncUdpSocket hostFromAddress:address];
uint16_t port = [GCDAsyncUdpSocket portFromAddress:address];
NSString *s = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// 继续来等待接收下一次消息
NSLog(@"收到服务端的响应 [%@:%d] %@", ip, port, s);
[sock receiveOnce:nil];
//此处根据实际和硬件商定的需求决定是否主动回一条消息
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self sendBackToHost:ip port:port withMessage:s];
});
}
- (void)udpSocketDidClose:(GCDAsyncUdpSocket *)sock withError:(NSError *)error
{
NSLog(@"udpSocket关闭");
}
-(void)sendBackToHost:(NSString *)ip port:(uint16_t)port withMessage:(NSString *)s{
NSString *msg = @"我收到了";
NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding];
[sendUdpSocket sendData:data toHost:ip port:port withTimeout:0.1 tag:200];
}