https://www.archie.tw/socket

CocoaAsyncSocket.swift

import CocoaAsyncSocket

let socket = GCDAsyncSocket(delegate: <#T##GCDAsyncSocketDelegate?#>, delegateQueue: <#T##DispatchQueue?#>)
do {
    try socket.connect(toHost: Host, onPort: Port)
} catch {
    print(error)
}

// GCDAsyncSocketDelegate
func socket(_ sock: GCDAsyncSocket, didConnectToHost host: String, port: UInt16) {
    // 連接上後，需要執行 readData 等候 Server 執行 writeData 的動作
    sock.readData(withTimeout: -1, tag: 0)
}

func socket(_ sock: GCDAsyncSocket, didRead data: Data, withTag tag: Int) {
    // 讀完資料後，還是需要再執行一次 readData，來等候下一次的資料傳輸過來
    sock.readData(withTimeout: -1, tag: 0)
}

func socketDidDisconnect(_ sock: GCDAsyncSocket, withError err: Error?) {
    
}

func socket(_ sock: GCDAsyncSocket, didWriteDataWithTag tag: Int) {
    
}