Dispatch after swift

dispatch.swift

func dispatch(#after: NSTimeInterval, queue: dispatch_queue_t = dispatch_get_main_queue(), #closure: dispatch_block_t) {
    let time = dispatch_time(DISPATCH_TIME_NOW, Int64(Double(after) * Double(NSEC_PER_SEC)))
    dispatch_after(time, dispatch_get_main_queue(), closure)
}

func dispatch(#after: NSTimeInterval, closure: dispatch_block_t) {
    dispatch(after: after, closure: closure)
}

dispatch(after: 0.5, { () -> Void in
    // ...
})