@IBAction func emojiButtonTapped(_ sender: UIButton) {
    let VC = storyboard?.instantiateViewController(withIdentifier: "EmojiController") as! EmojiViewController
    VC.preferredContentSize = CGSize(width: 200, height: 100)
    let navController = UINavigationController(rootViewController: VC)
    navController.modalPresentationStyle = UIModalPresentationStyle.popover

    let popOver = navController.popoverPresentationController
    popOver?.sourceView = sender
    popOver?.sourceRect = sender.bounds
    popOver?.delegate = self

    self.present(navController, animated: true, completion: nil)
}

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    return .none
}