swift UIAlertController实现

iOS8.0以上，苹果建议使用UIAlertController

    let alertView = UIAlertController.init(title: "提示", message: "信息", preferredStyle: .alert)

    let alert = UIAlertAction.init(title: "确定", style: .destructive) { (UIAlertAction) in
                  print("确定按钮点击")
    }
    let cancleAlert = UIAlertAction.init(title: "取消", style: .cancel) { (UIAlertAction) in
        
        print("点击取消按钮")
    }
    alertView.addAction(cancleAlert)

    alertView.addAction(alert);

    self.present(alertView, animated: true, completion: nil)