Swift：使用GCDAsyncUdpSocket接收UDP

Question

背景：

我希望能夠在iOS應用程序和服務器之間發送和接收UDP數據包。 服務器將每個傳入消息回顯給客戶端應用程序。 服務器已經過測試並確認正在工作。我有一個StartViewController，它啓動了兩個實現GCDAsyncUdpSocketDelegate的類，一個用於發送，另一個用於接收。 「發送套接字」正在工作，服務器收到消息。

問題：

的應用從未得到它發出後回傳入的消息。與偵聽套接字設置的東西可能是錯誤的，因爲didReceiveData永遠不會被調用。

我這樣做完全錯了嗎？

開始：

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)"); 
    } 
} 

發送：

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") 
    } 
} 

編輯： 新增遺忘代碼行。

Answer 1

我終於得到它與這個插座的設置工作：

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) 
}