First of all, start by creating a new Swift file and name it something like HLRequestDelegate ; that will define your protocol.

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protocol HLRequestDelegate {
    
    func doNothing();
    func request(request: HLRequest, didSucceedWithData: NSData);
}

To call your delegate, you may now create a new class instance and call methods defined in previous Swift file.

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class HLRequest: NSObject, NSURLConnectionDelegate {
    
    var delegate: HLRequestDelegate? // create a new delegate instance
    
    func executeRequest()
    {
        println("Attempt to execute request")
        delegate?.request(self, didSucceedWithData: NSData()) // let's trigger our delegate instance
    }
}

The last thing to do is to implement our delegate. Open your Swift class and add your protocol at the top of class declaration, and implement the methods, this way:

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class EYHomeVC: UIViewController, HLRequestDelegate[/objc]
 
 
[objc]func doNothing() {
    println("I'm totally useless");
}
 
func request(request: HLRequest, didSucceedWithData data: NSData)
{
    var stringData: NSString = NSString(data: NSData(data: data), encoding: 4)
    println("Response body: \(stringData)")
}

You can now get your methods called by assigning delegate:

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var productRequest: HLRequest = HLRequest()
productRequest.delegate = self
productRequest.executeRequest()

Find complete snippet here.