背景：
我想能够在我的iOS应用和服务器之间发送和接收UDP数据包.
服务器回传每个传入的消息给客户端的应用程序.服务器经过测试和确认工作.我有一个StartViewController,它启动两个实现GCDAsyncUdpSocketDelegate的类,一个用于发送,另一个用于接收. “发送套接字”正在工作,服务器收到消息.
问题：
应用程序在发送后不会收到传入的消息.由于didReceiveData从来没有被调用,所以有一些侦听套接字设置可能是错误的.
我这样做完全错了吗？
开始：
class StartViewController: UIViewController {
var inSocket : InSocket!
var outSocket : OutSocket!
override func viewDidLoad() {
super.viewDidLoad()
inSocket = InSocket()
outSocket = OutSocket()
}
@IBAction func goButton(sender: UIButton) {
outSocket.send("This is a message!")
}
}
接收：
class InSocket: NSObject,GCDAsyncUdpSocketDelegate {
let IP = "255.255.255.255"
let PORT:UInt16 = 5556
var socket:GCDAsyncUdpSocket!
override init(){
super.init()
setupConnection()
}
func setupConnection(){
var error : NSError?
socket = GCDAsyncUdpSocket(delegate: self,delegateQueue: dispatch_get_main_queue())
socket.bindToPort(PORT,error: &error)
socket.enablebroadcast(true,error: &error)
socket.joinMulticastGroup(IP,error: &error)
socket.beginReceiving(&error)
}
func udpSocket(sock: GCDAsyncUdpSocket!,didReceiveData data: NSData!,fromAddress address: NSData!,withFilterContext filterContext: AnyObject!) {
println("incoming message: \(data)");
}
}
发送：
class OutSocket: NSObject,GCDAsyncUdpSocketDelegate {
let IP = "90.112.76.180"
let PORT:UInt16 = 5556
var socket:GCDAsyncUdpSocket!
override init(){
super.init()
setupConnection()
}
func setupConnection(){
var error : NSError?
socket = GCDAsyncUdpSocket(delegate: self,delegateQueue: dispatch_get_main_queue())
socket.connectToHost(IP,onPort: PORT,error: &error)
}
func send(message:String){
let data = message.dataUsingEncoding(NSUTF8StringEncoding)
socket.sendData(data,withTimeout: 2,tag: 0)
}
func udpSocket(sock: GCDAsyncUdpSocket!,didConnectToAddress address: NSData!) {
println("didConnectToAddress");
}
func udpSocket(sock: GCDAsyncUdpSocket!,didNotConnect error: NSError!) {
println("didNotConnect \(error)")
}
func udpSocket(sock: GCDAsyncUdpSocket!,didSendDataWithTag tag: Int) {
println("didSendDataWithTag")
}
func udpSocket(sock: GCDAsyncUdpSocket!,didNotSendDataWithTag tag: Int,duetoError error: NSError!) {
println("didNotSendDataWithTag")
}
}
编辑：
添加了忘记的代码行.
解决方法
我终于得到它使用这个套接字设置：
func setupConnection(){
var error : NSError?
socket = GCDAsyncUdpSocket(delegate: self,delegateQueue: dispatch_get_main_queue())
socket.bindToPort(PORT,error: &error)
socket.connectToHost(SERVER_IP,error: &error)
socket.beginReceiving(&error)
send("ping")
}
func send(message:String){
let data = message.dataUsingEncoding(NSUTF8StringEncoding)
socket.sendData(data,tag: 0)
}