背景:
我希望能够在我的iOS应用程序和服务器之间发送和接收UDP数据包。服务器将所有传入消息回显给应用程序客户端。 服务器已测试并确认可以正常工作 。我有一个StartViewController,它启动了两个实现GCDAsyncUdpSocketDelegate的类,一个用于发送,一个用于接收。“发送套接字”正在工作,服务器接收到消息。
问题:
在发送后,该应用程序再也不会取回传入的消息。监听套接字设置有些问题,因为didReceiveData永远不会被调用。
我做错了吗?
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: 添加了被遗忘的代码行。
我终于可以使用此套接字设置了:
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) }