NSTimer+.swift

//
//  Extensions.swift
//  Tests
//
//  Created by Pilipenko Dima on 4/1/15.
//  Copyright (c) 2015 Pilipenko Dima. All rights reserved.
//

import Foundation

extension NSTimer {
    class func delay(value: NSTimeInterval, completion: () -> Void) {
        NSTimer.scheduledTimerWithTimeInterval(value, target: self, selector: "timerDidFired:", userInfo: ["box": Box(completion)], repeats: false)
    }
    
    class func timerDidFired(timer: NSTimer) {
        if let userInfo = timer.userInfo as? [String: Box], box = userInfo["box"] {
            let callback = box.unbox()
            callback()
        }
    }
}

private class Box {
    typealias Callback = () -> Void
    
    private var _callback: Callback!
    
    init(_ callback: Callback) {
        self._callback = callback
    }
    
    func unbox() -> Callback {
        return _callback
    }
    
    deinit {
        _callback = nil
    }
}

Usage:

NSTimer.delay(2) {
    println("Psh!")
}

Now you can check lib here: https://github.com/dimpiax/RichTimer