Cannot set delegate in Swift

Hello.

I am trying to create a TCP connection class with protocol and delegate instances and methods:

protocol IGAConnectionTCPDelegate
{
    var ipAddressString : String {get set}
    var ipPort : UInt32 {get set}
    var messageToServer : String {get set}

    func messageReceived(message: NSString)
    func displayErrorWithTitle(title: String, errorMessage err: String)
}
class IGAConnectionTCP: NSObject, NSStreamDelegate
{
    var delegate: IGAConnectionTCPDelegate?

    var inputStream : NSInputStream?
    var outputStream : NSOutputStream?
    var outputBuffer : NSMutableData!
    var error : NSError?

    func openNetworkCommunication()
    {

        if(self.inputStream != nil && self.outputStream != nil)
        {
            closeNetworkCommunication()
        }

        let ipAddress = delegate?.ipAddressString as! CFStringRef
        let portNumber = delegate?.ipPort

        var readStream:  Unmanaged<CFReadStream>?
        var writeStream: Unmanaged<CFWriteStream>?
        CFStreamCreatePairWithSocketToHost(nil, ipAddress, portNumber!, &readStream, &writeStream)

        self.inputStream = readStream!.takeRetainedValue()
        self.outputStream = writeStream!.takeRetainedValue()

        self.outputBuffer = delegate?.messageToServer.dataUsingEncoding(NSUTF8StringEncoding) as? NSMutableData

        self.inputStream?.delegate = self
        self.outputStream?.delegate = self

        self.inputStream?.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
        self.outputStream?.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)

        self.inputStream?.open()
        self.outputStream?.open()

        println("OPENWORKCOMMUNICATION")

    }


    func closeNetworkCommunication()
    {
       ...

        println("CLOSENETWORKCOMMUNICATION")
    }


    func stream(theStream : NSStream, handleEvent streamEvent : NSStreamEvent)
    {
        ...
    }

   
    func sendToServer()
    {
       ...
    }

}

And then I try to make the following method conform to the protocol:

// GET MY FIRST ERROR MESSAGE HERE
class IGAFlightplanVC: UIViewController, IGAConnectionTCPDelegate
{
    var connectionObj = IGAConnectionTCP()

    var ipAddressString = "192.168.1.6"
    var ipPort = 7767
    var messageToServer = "MESSAGE"

    override func viewDidLoad()
    {
        super.viewDidLoad()

        //GET MY SECOND ERROR HERE!!! 
        connectionObj.delegate = self
    }


    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }

    func messageReceived(message : NSString)
    {
        println(message)
    }


    func makeMessageToServer() -> String
    {
        let finalMessage = "MESSAGE:";
        return finalMessage;
    }


    func displayErrorWithTitle(title: String, errorMessage: String)
    {
        var disconnectMsg = UIAlertController(title: title, message: errorMessage as String, preferredStyle: UIAlertControllerStyle.Alert)
        disconnectMsg.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(disconnectMsg, animated: true, completion: nil)
    }

My first error message is:

class IGAFlightplanVC: UIViewController, IGAConnectionTCPDelegate
Type 'IGAFlightplanVC' does not conform to protocol IGAConnectionTCPDelegate

My second error message is:

self.connectionObj.delegate = self
Cannot assign a value of type 'IGAFlighplanVC' to a value of type IGAConnectionTCPDelegate?

What am I doing wrong?

Thanks a lot!