@available(iOS 9.0, *)
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
  return application(app, open: url,
                     sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String,
                     annotation: "")
}

func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
  if let dynamicLink = DynamicLinks.dynamicLinks().dynamicLink(fromCustomSchemeURL: url) {
    // Handle the deep link. For example, show the deep-linked content or
    // apply a promotional offer to the user's account.
    // ...
    return true
  }
  return false
}