如何在Rubymotion webview中添加确认AlertDialog？

alert = UIAlertView.alloc.initWithTitle("确认", message:"是否继续操作？", delegate:nil, cancelButtonTitle:"取消", otherButtonTitles:"确定", nil)
alert.show

# 处理用户点击按钮的回调
alert.clickedButtonAtIndex = Proc.new { |alertView, buttonIndex|
  if buttonIndex == 1
    # 用户点击了确定按钮，执行相应操作
    # ...
  else
    # 用户点击了取消按钮，执行相应操作
    # ...
  end
}

alertController = UIAlertController.alertControllerWithTitle("确认", message:"是否继续操作？", preferredStyle:UIAlertControllerStyleAlert)

# 添加取消按钮
cancelAction = UIAlertAction.actionWithTitle("取消", style:UIAlertActionStyleCancel, handler:nil)
alertController.addAction(cancelAction)

# 添加确定按钮
confirmAction = UIAlertAction.actionWithTitle("确定", style:UIAlertActionStyleDefault, handler:Proc.new { |action|
  # 用户点击了确定按钮，执行相应操作
  # ...
})
alertController.addAction(confirmAction)

# 显示弹窗
viewController.presentViewController(alertController, animated:true, completion:nil)