yesnoBox

Yes-No-MessageBox

func yesnoBox(title aTitle:String, message aMessage:String) {
  var retcode:Bool = false
  let alert = UIAlertController(
    title: aTitle,
    message: aMessage,
    preferredStyle: .alert
  )
  alert.addAction(
     UIAlertAction(title: "Yes", style: .cancel,
          handler: { (_) in
              retcode=false
              //self.messageBox(message: "You tip no",  title: "Yes/No")
          }
     )
  )
  alert.addAction(
     UIAlertAction(title: "No", style: .destructive,  // always right
          handler: { (_) in
              retcode=true
              //self.messageBox(message: "You tip yes", title: "Yes/No")
          }
     )
  )
  present(alert, animated: true,  completion: nil    )
}  // yesNo