功能需求:
发送广播,搜索设备
【在wifi下无法接收广播,原因: 路由器阻止广播】
//
// ViewController.swift
// 3-SwiftSocket-udp
//
// Created by 黄涛 on 17/4/10.
// Copyright © 2017年 huangtao. All rights reserved.
//
import UIKit
class ViewController:UIViewController,GCDAsyncUdpSocketDelegate {
@IBOutletweakvar btnStart:UIButton!
@IBOutletweakvar lbRecvMsg:UITextView!
var mainQueue =dispatch_get_main_queue()
var udp:GCDAsyncUdpSocket!;
let localPort:UInt16 =54321;
let boardcasePort:UInt16 =1001;
overridefunc viewDidLoad() {
super.viewDidLoad()
btnStart.addTarget(self, action:"btnStartClickFun", forControlEvents:UIControlEvents.TouchUpInside)
udp =GCDAsyncUdpSocket(delegate:self, delegateQueue:dispatch_get_main_queue());
do
{
tryudp.enableBroadcast(true)
tryudp.bindToPort(localPort, interface:udpError);
tryudp.beginReceiving();
}
catch{
print("catch:\(udpError)")
}
}
var udpError:String?;
func btnStartClickFun(){
//开始广播
udp.sendData("#SYSTEM\n".dataUsingEncoding(NSUTF8StringEncoding), toHost: "255.255.255.255", port:boardcasePort, withTimeout: -1, tag:0);
}
func udpSocket(sock:GCDAsyncUdpSocket!, didReceiveData data:NSData!, fromAddress address:NSData!, withFilterContext filterContext:AnyObject!) {
let recv:NSString =NSString(data: data, encoding:NSUTF8StringEncoding)!;
// 2 主界面ui显示数据
dispatch_async(mainQueue, {
let showStr:NSMutableString =NSMutableString()
showStr.appendString(recvasString)
showStr.appendString("\n")
self.lbRecvMsg.text = showStrasString;
})
}
func udpSocket(sock:GCDAsyncUdpSocket!, didNotConnect error:NSError!) {
print("连接失败:\(error)")
}
func udpSocket(sock:GCDAsyncUdpSocket!, didSendDataWithTag tag:Int) {
print("已经发送数据:\(tag)")
}
func udpSocketDidClose(sock:GCDAsyncUdpSocket!, withError error:NSError!) {
print("断开连接 error:\(error)")
}
func udpSocket(sock:GCDAsyncUdpSocket!, didConnectToAddress address:NSData!) {
print("开始连接")
}
overridefunc didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}