YPDrawSignatureView - дубликаты ячеек TableView

Question

Я использовал YPDrawSignatureView для ячейки TableView, при прокрутке табличного представления ячейки являются дублирующими сигнатурами, кто-нибудь знает, как это решить.

моя функция cellForRow:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
      var cell = tableView.dequeueReusableCell(withIdentifier: Constants.signatureTabelViewCell ) as! SignautreTableViewCell
      let signatureData = signature[indexPath.row]
      cell = SignautreTableViewCell.configureCell(cell: cell, forSignature: signatureData, atIndex: indexPath.row) 
      cell.delegate = self
      return cell }

class Signature {varНазвание: Строка! var view: YPDrawSignatureView! }

протокол DataSourceUpdateDelegate: class {func signatureValueChanged (ячейка: SignautreTableViewCell, nameChanged updatedValue: String, viewChanged: YPDrawSignatureView)}

// cellEeBeateLeGateLeGeateLeGateLeCeateLeCeateLeGateLeCeateLeCeateLeCateLeGeTeCeTeGeTeeGe. {

@IBOutlet var textField: UITextField!
@IBOutlet weak var signatureView: YPDrawSignatureView!

weak var delegate: DataSourceUpdateDelegate?

override func awakeFromNib() {
    super.awakeFromNib()
    textField.delegate = self
    signatureView.delegate = self
}


override func prepareForReuse() {
    super.prepareForReuse()

}

class func configureCell(cell: SignautreTableViewCell, forSignature signature: Signature, atIndex index: Int) -> SignautreTableViewCell {

    cell.tag = index
    cell.textField.text = signature.name
    cell.signatureView = signature.view
    return cell
}



func textFieldDidEndEditing(_ textField: UITextField) {
    self.delegate?.signatureValueChanged(cell: self, nameChanged: textField.text!, viewChanged: signatureView)
}

// Function for clearing the content of signature view
@IBAction func clearSignature(_ sender: UIButton) {
    // This is how the signature gets cleared
    self.signatureView.clear()
}

// Function for saving signature
@IBAction func saveSignature(_ sender: UIButton) {
    // Getting the Signature Image from self.drawSignatureView using the method getSignature().
    if let signatureImage = self.signatureView.getSignature(scale: 10) {

        // Saving signatureImage from the line above to the Photo Roll.
        // The first time you do this, the app asks for access to your pictures.
        UIImageWriteToSavedPhotosAlbum(signatureImage, nil, nil, nil)

        // Since the Signature is now saved to the Photo Roll, the View can be cleared anyway.
        self.signatureView.clear()
    }
}

}

расширение SignautreTableViewCell: YPSignatureDelegate {

func didStart(_ view: YPDrawSignatureView) {
    print("Started Drawing")
  self.delegate?.signatureValueChanged(cell: self, nameChanged: textField.text!, viewChanged: view)

}

func didFinish(_ view: YPDrawSignatureView) {
    print("Finished Drawing")
   self.delegate?.signatureValueChanged(cell: self, nameChanged: textField.text!, viewChanged: view)
}

}