iOS 如何通过套接字从服务器接收数据？

Question

我有一个应用程序，我必须在其中使用套接字连接将数据发送到服务器并读取将由服务器发送的数据。我正在使用 AsyncSocket class 来写入和读取数据。我成功地在服务器上写入数据，服务器可以看到应用程序发送的数据。现在，问题是每当服务器向应用程序发送一些数据时，我如何使用 AsyncSocket class 接收这些数据。下面是我的代码。我将委托方法用于读取数据，但它从未调用过。

var socket = AsyncSocket()

socket = AsyncSocket(delegate: self)
self.socketConnect()

func socketConnect() {
        do {
            try socket?.connectToHost("IP Address", onPort: 6968)
        } catch _ as NSError {

        }
    }



//MARK: - AsyncSocket Delegates method

    func onSocket(sock: AsyncSocket!, didConnectToHost host: String!, port: UInt16) {
        print("Connected to host : \(host) with Port : \(port)")


        let alert:UIAlertController = UIAlertController(title: "Connected", message: "Host:\(host) ** Port:\(port)", preferredStyle:.Alert)
        self.presentViewController(alert, animated: true, completion: nil)
        let action:UIAlertAction = UIAlertAction(title: "Ok", style: .Default) { (UIAlertAction) -> Void in
            print("Ok Pressed")
        }
        alert .addAction(action)

        let dict = ["iUserId":"100","iRideId":"276","type":"client"] // For client side
        var jsonString = NSString()
        do {
            let data = try NSJSONSerialization.dataWithJSONObject(dict , options: NSJSONWritingOptions.PrettyPrinted)
            jsonString = NSString(data: data, encoding: NSUTF8StringEncoding)!

        }catch let error as NSError {
            print(error)
        }
        let reqData = jsonString.dataUsingEncoding(NSUTF8StringEncoding)
        socket.writeData(reqData, withTimeout: 1.0, tag: 100)

    }

    func onSocket(sock: AsyncSocket!, didReadPartialDataOfLength partialLength: UInt, tag: Int) {
        print("Read partial data")
    }

    func onSocket(sock: AsyncSocket!, didWriteDataWithTag tag: Int) {
        print("Data write successfully")
    }

    func onSocket(sock: AsyncSocket!, didReadData data: NSData!, withTag tag: Int) {
        print("Data read successfully")
    }

    func onSocket(sock: AsyncSocket!, willDisconnectWithError err: NSError!) {
        print("Socket disconnect with error :\(err.description)")
    }

    func onSocket(sock: AsyncSocket!, didAcceptNewSocket newSocket:  AsyncSocket!) {
       print("Accept new socket")
    }

Answer 1

我已经为自己找到了答案。我错过的是当套接字连接到主机时我必须放置 readdata 行。所以在写完这个 didReadData 方法之后将被调用，并且在该方法中还必须编写我在 didConnectToHost 方法中编写的单行代码。

func socket(sock: GCDAsyncSocket!, didConnectToHost host: String!, port: UInt16) {
        print("Connected to host : \(host) with Port : \(port)")
        socket.readDataWithTimeout(-1, tag: 0)
    }

func socket(sock: GCDAsyncSocket!, didReadData data: NSData!, withTag tag: Int) {
        print("Data read successfully")


        socket.readDataWithTimeout(-1, tag: 0)
}

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