how to use 'Currying' and implement UIControl

gistfile1.txt

protocol TargetAction{
    func performAction()
}

struct TargetActionWrapper<T:AnyObject>:TargetAction {
    
    weak var target : T?
    
    var action:(T)->()->()
    
    func performAction() {
        
        if let t  = target{
            action(t)() // real return a function ()->()
        }
    }
}


enum ControlsEvents{
    case TouchUpInside
    case ValueChanged
    case TouchDownOutside
}


class TKControl {
    
    var actions = [ControlsEvents:TargetAction]()
    
    //settargetaction Target/Action/ControlStatus
    func setTarget<T : AnyObject>(target:T,action:(T)->()->(),controlEvent:ControlsEvents)
    {
        let item = TargetActionWrapper(target: target, action: action)
        actions[controlEvent] = item
    }
    
    //add events
    func performActionForControlEvent(controlEvent: ControlsEvents) {
        actions[controlEvent]?.performAction()
    }
    
    //remove events
    func removeTargetForControlEvent(controlEvent: ControlsEvents) {
        actions[controlEvent] = nil
    }
    
    func click()
    {
        
    }
    
    func log()
    {
       // println("some body jiekuan summary")
    }
}

class ViewController: UIViewController {

    func onButtonTap() -> () {
        println("Button was tapped")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        var button  = TKControl()

        button.log()

        button.setTarget(self, action: ViewController.onButtonTap, controlEvent: ControlsEvents.TouchUpInside)

        println("count : \(button.actions.count)")
        // Do any additional setup after loading the view, typically from a nib.
    }


    @IBAction func seeLog(sender: AnyObject) {

        UIAlertView(title: "title", message: "ok", delegate: nil, cancelButtonTitle: "ok").show()
        TKControl().click();
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

is setting button.setTarget(self, action: ViewController.onButtonTap, controlEvent: ControlsEvents.TouchUpInside) enough? Who is going to call func performActionForControlEvent(controlEvent: ControlsEvents)?