UIActivityViewController empty inside UIInputViewController

Code Block 
class KeyboardViewController: UIInputViewController {
  @IBAction func shareAction(_ sender: UIButton) {
   
  DispatchQueue.main.async {
   let text = "This is the text....."
   let textShare = [ text ]
   let activityViewController = UIActivityViewController(activityItems: textShare, applicationActivities: nil)
   activityViewController.popoverPresentationController?.sourceView = self.buttons[
   self.present(activityViewController, animated: true, completion: nil)
  }
   
 }
}