如何在颤动中对齐TabBar的元素？

Question

我有一个带三个选项的标签/导航栏。但是其中的图标未在中间对齐。图标在其他设备上看起来对齐，但在iPhone上不对齐。由于某种原因，它们似乎被推高了一点。

  Widget _bottomNavigationBar(int selectedIndex) => 
        Container(
            height: 90,
                decoration: BoxDecoration(
              borderRadius: const BorderRadius.only(
                  topLeft: Radius.circular(52.0),
                  topRight: Radius.circular(52.0)),
              boxShadow: <BoxShadow>[
                BoxShadow(
                  color: Colors.black.withOpacity(0.5),
                  offset: Offset(-5, 5),
                  blurRadius: 20,
                ),
              ],
            ),
            child: ClipRRect(
              borderRadius: BorderRadius.only(
                  topLeft: Radius.circular(52.0),
                  topRight: Radius.circular(52.0)),
              child: BottomNavigationBar(
                selectedItemColor: Color(0xFFFE524B),
                unselectedItemColor: Color(0xFFFF8C3B),
                onTap: (int index) => setState(() => _selectedIndex = index),
                currentIndex: selectedIndex,
                items: const <BottomNavigationBarItem>[
                  BottomNavigationBarItem(
                      icon: Icon(
                        Entypo.home,
                        size: 28,
                      ),
                      title: Text('')),
                  BottomNavigationBarItem(
                      icon: Icon(
                        Entypo.game_controller,
                        size: 28,
                      ),
                      title: Text('')),
                  BottomNavigationBarItem(
                      icon: Icon(
                        Entypo.wallet,
                        size: 28,
                      ),
                      title: Text('')),
                ],
              ),
            )); 

谢谢您的帮助！