how to use socket in swift (connect, send and get message)

Question

I am new swift. I want to make chat for iphone so i need to use client sokect. how to make this. give me advise or example plz. I tried this https://github.com/socketio/socket.io-client-swift but not connected and tried this code

 let client:TCPClient = TCPClient(addr: "89.236.254.27", port: 9000)
     let (success,errmsg) = client.connect(timeout: 1)
     if success {
          let (success,errmsg) = client.send(str:"Hello World!")
          if success {
               let data = client.read(1024 * 10)
               if let d = data {
                    if let str = NSString(bytes: d, length: d.count, encoding: NSUTF8StringEncoding) {
                         print(str)
                    }
               }
          } else {
               print(errmsg)
          }
     } else {
          print(errmsg)
     }

after change this code:

 override func viewDidLoad() {
     super.viewDidLoad()

     let qualityOfServiceClass = QOS_CLASS_BACKGROUND
     let backgroundQueue = dispatch_get_global_queue(qualityOfServiceClass, 0)
     dispatch_async(backgroundQueue, {
         let client:TCPClient = TCPClient(addr: "89.236.254.27", port: 9000)
         var (success, errmsg)=client.connect(timeout: 1)
         if success {
             var (isSuccess, errorMessage) = client.send(str: "Hello!")
             if success {
                 let data = client.read(1024 * 4)
                 if let d = data {
                     if let str = NSString(bytes: d, length: d.count, encoding: NSUTF8StringEncoding) as? String {
                         print(str)
                     }
                 }
             } else {
                 print(errmsg)
             }
         } else {
             print(errmsg)
         }
         dispatch_async(dispatch_get_main_queue(), { 
            () -> Void in
            print("This is run on the main queue, after the previous code in outer block")
         })
     })
 }

Answer 1

I use the SwiftSocket https://github.com/swiftsocket/SwiftSocket for TCP connection. It is easy to use. For example for using it (i add comments to it):

I have my wrapper for work with this lib and this is the method how to send request and get response:

    private func blockingRequest(data: String, client: TCPClient?) -> (data: String?, error: ConnectionError?) {
        // It use ufter connection
        if client != nil {
            // Send data
            var (isSuccess, errorMessage) = client!.send(str: data)
            if isSuccess {
                // Read response data
                var data = client!.read(1024*10)
                if let d = data {
                    // Create String from response data
                    if let str = NSString(bytes: d, length: d.count, encoding: NSUTF8StringEncoding) as? String {
                        return (data: str, error: nil)
                    } else {
                        return (data: nil, error: ConnectionError.BadResponseData)
                    }
                } else {
                    return (data: nil, error: ConnectionError.BadResponseData)
                }
            } else {
                println(errorMessage)
                return (data: nil, error: ConnectionError.RequestError)
            }
        } else {
            return (data: nil, error: ConnectionError.RequestError)
        }
    }