UIButton-Colsure

import UIKit

@objc class ClosureDispatch {
    init(f:()->()) { self.action = f }
    func execute() -> () { action() }
    let action: () -> ()
}

var redBlueGreen:[String] = ["Red", "Blue", "Green"]
let buttons:[UIButton] = map(0..<redBlueGreen.count) { i in
    let text = redBlueGreen[i]
    var btn = UIButton(frame: CGRect(x: i * 50, y: 0, width: 100, height: 44))
    btn.setTitle(text, forState: .Normal)
    btn.setTitleColor(UIColor.redColor(), forState: .Normal)
    btn.backgroundColor = UIColor.lightGrayColor()
    return btn
}

let functors:[ClosureDispatch] = map(buttons) { btn in
    let functor = ClosureDispatch(f:{ [unowned btn] in
        println("Hello from \(btn.titleLabel!.text!)") })
    btn.addTarget(functor, action: "execute", forControlEvents: .TouchUpInside)
    return functor
}