[sharing] #swift

sharing.swift

func share(message: String, image: UIImage, completionHandler: (() -> Void)? = nil) {
  let activityViewController = UIActivityViewController(activityItems: [message, image], applicationActivities: nil)
  if let completionHandler = completionHandler {
    activityViewController.completionWithItemsHandler = { _ in
      completionHandler()
    }
  }
  self.present(activityViewController, animated: true, completion: nil)
}