@discardableResult
  public func
    application(_ application: UIApplication,
                didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
    return delegate?.application(application, didFinishLaunchingWithOptions: launchOptions) ?? false
  }

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