flutter showModalBottomSheet max height

  static void showBuyServiceDialog(BuildContext context) {
    showModalBottomSheet(
      context: context,
      isScrollControlled: false,
      builder: (ctx) {
        return BuySeviceDialog();
      },
    );
  }

當從底部彈窗BuySeviceDialog這個視圖的時候，默認最大高度為當前屏幕的一半，只有開啟isScrollControlled=true,才可以設置任意高度

https://stackoverflow.com/a/53318679