/// **Note:** the timer won't fire until it's scheduled on the run loop.

/// Use `NSTimer.after` to create and schedule a timer in one step.

let actor = NSTimerActor(block)

return self.init(timeInterval: interval, target: actor, selector: "fire", userInfo: nil, repeats: false)

}

/// **Note:** the timer won't fire until it's scheduled on the run loop.

/// Use `NSTimer.every` to create and schedule a timer in one step.

let actor = NSTimerActor(block)

return self.init(timeInterval: interval, target: actor, selector: "fire", userInfo: nil, repeats: true)

}

/// Create and schedule a timer that will call `block` once after the specified time.

let timer = NSTimer.new(after: interval, block)

NSRunLoop.currentRunLoop().addTimer(timer, forMode: NSDefaultRunLoopMode)

return timer

}

/// Create and schedule a timer that will call `block` repeatedly in specified time intervals.

let timer = NSTimer.new(every: interval, block)

NSRunLoop.currentRunLoop().addTimer(timer, forMode: NSDefaultRunLoopMode)

return timer

}

extension Int {

extension Double {