execute a block code after a specified delay

Make delay tasks in special time in Swift

func delay(delay: Double, closure: ()->()) { 
  dispatch_after(
    dispatch_time(
      DISPATCH_TIME_NOW,
      Int64(delay * Double(NSEC_PER_SEC))
    ),
    dispatch_get_main_queue(),
    closure
  )
}

delay(3.0) {
// TODO
}