Flutter学习笔记（39）--BottomNavigationBar底部item超过3个只显示icon，不显示title

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          items: [
            _bottomItem(Ids.home, 'ic_home_normal', 'ic_home_selected', 0),
            _bottomItem(Ids.information, 'ic_discovery_normal', 'ic_discovery_selected', 1),
            _bottomItem(Ids.news, 'ic_hot_normal', 'ic_hot_selected', 2),
            _bottomItem(Ids.mine, 'ic_mine_normal', 'ic_mine_selected', 3),
          ],

加上type: BottomNavigationBarType.fixed,即可

items: [
            _bottomItem(Ids.home, 'ic_home_normal', 'ic_home_selected', 0),
            _bottomItem(Ids.information, 'ic_discovery_normal', 'ic_discovery_selected', 1),
            _bottomItem(Ids.news, 'ic_hot_normal', 'ic_hot_selected', 2),
            _bottomItem(Ids.mine, 'ic_mine_normal', 'ic_mine_selected', 3),
          ],
          type: BottomNavigationBarType.fixed,