Swift Timer

import Foundation

@objc class Timer: NSObject {
    var timer: NSTimer?
    var handler: (() -> ())!
    let duration: Double
    
    init(duration: Double) {
        self.duration = duration
        super.init()
    }
    
    func start(handler: () -> ()) {
        self.handler = handler
        self.timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: self, selector: "call", userInfo: nil, repeats: true)
    }
    
    func stop() {
        self.timer?.invalidate()
    }
    
    @objc func call() {
        self.handler()
    }
    
    deinit {
        println("deinit timer called")
        self.timer?.invalidate()
    }
}