flutter : align icon to the middle -- bottom navigation bar

Question

我的 flutter 应用程序中有一个底部导航栏。如何将图标对齐到中间。目前，它似乎是顶部对齐

Widget _bottomNavigationBar(int selectedIndex) {
    return BottomNavigationBar(
      backgroundColor: Palette.YELLOW,
      onTap: (int index) {
        setState(() {
          userModel.selectedIndex = index;
        });
      },
      currentIndex: userModel.selectedIndex,
      items: <BottomNavigationBarItem>[
        BottomNavigationBarItem(
          icon: Image.asset(
            "assets/images/search_nav_icon.png",

          ),
          title: Text(''),
        ),
        BottomNavigationBarItem(
            icon: Image.asset(
              "assets/images/fav_nav_icon.png",

            ),
      ],
    );
  }

Answer 1

当使用图标而没有文本时，这对我有用。

返回底部导航栏( showSelectedLabels: false, showUnselectedLabel: false, //...);