BottomNavigationBar

下面是bottomnavigationbar的具体用法：
bottomNavigationBar: BottomNavigationBar(
  currentIndex: highlight,//选择高亮显示的Tab选项，每个Tab都有编号的，从0开始编号；
  onTap: (int index){
    setState(() {
      highlight=index;//这里的index就是下面导航按钮的编号，每个Tab都有编号的，从0开始

    });
  },
  items: [
    BottomNavigationBarItem(icon: Icon(Icons.airplay),title: Text('AirPlay'),backgroundColor: Colors.orange),//编号0
    BottomNavigationBarItem(icon: Icon(Icons.directions_bike),title: Text('directions_bike'),backgroundColor: Colors.orange),//编号2
    BottomNavigationBarItem(icon: Icon(Icons.add_a_photo),title: Text('add_a_photo'),backgroundColor: Colors.orange),//编号2
    BottomNavigationBarItem(icon: Icon(Icons.email),title: Text('email'),backgroundColor: Colors.orange),//编号3
  ],
),

标签：title,Text,Icons,backgroundColor,编号,orange,BottomNavigationBar
来源： https://www.cnblogs.com/braveheart007/p/10727451.html