Swift：使用GCDAsyncUdpSocket接收UDP [英] Swift: Receive UDP with GCDAsyncUdpSocket

问题描述

背景：

我希望能够在我的iOS应用和服务器之间发送和接收UDP数据包。
服务器将每个传入消息回送给应用程序的客户端。 服务器经过测试并确认正常运行。我有一个StartViewController，启动两个实现GCDAsyncUdpSocketDelegate的类，一个用于发送，一个用于接收。 发送套接字正在运行，服务器收到消息。

I want to be able to send and receive UDP packets between my iOS app and a server. The server echoes back every incoming message to the client the app. The server is tested and confirmed working. I have a StartViewController which starting up two classes that implements GCDAsyncUdpSocketDelegate, one for sending and one for receiving. The "sending socket" is working, the server receives the messages.

问题：

该应用从未获得传入的消息在发送后返回。听取套接字设置的东西可能是错误的，因为didReceiveData永远不会被调用。

The app never get the incoming message back after it been sent. Something with the listening socket setup is probably wrong since didReceiveData never get called.

我完全错了吗？

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!")
   }
}

收到：

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：
添加了遗忘的代码行。

Added forgotten code line.

推荐答案

我终于使用了这个套接字设置：

I finally got it to work with this socket setup:

func setupConnection(){
    var error : NSError?
    socket = GCDAsyncUdpSocket(delegate: self, delegateQueue: dispatch_get_main_queue())
    socket.bindToPort(PORT, error: &error)
    socket.connectToHost(SERVER_IP, onPort: PORT, error: &error)
    socket.beginReceiving(&error)
    send("ping")
}

func send(message:String){
   let data = message.dataUsingEncoding(NSUTF8StringEncoding)
   socket.sendData(data, withTimeout: 2, tag: 0)
}

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