flutter/Dart : Customize Bottom Navigation Bar height

Question

有没有办法自定义 BottomNavigationBar 的高度？

我目前有一个 BottomNavigationBar，带有用于点击/滑动导航的选项卡，但是默认高度(即使在减少文本和图标之后)还是太高了。

@override
Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(
    backgroundColor: Colors.blue,
    title: Text( 'RefLog', style: Styles.headerLarge ),
    actions: <Widget>[
      new IconButton(
        icon: Icon(Icons.list),
        onPressed: () {},
      )
    ],
  ),
  body: DefaultTabController(
    length: 3,
    child: Scaffold(
      body: TabBarView(
        children: _children,
      ),
      bottomNavigationBar: TabBar(
        tabs: [
          Tab( text: 'One', icon: Icon(Icons.import_contacts, size: 20.0) ),
          Tab( text: 'Two', icon: Icon(Icons.restaurant, size: 20.0) ),
          Tab( text: 'Three', icon: Icon(Icons.record_voice_over, size: 20.0) ),
        ],
        labelStyle: TextStyle(fontSize: 12.0),
        labelColor: Colors.white,
        unselectedLabelColor: Colors.white30,
        indicatorSize: TabBarIndicatorSize.label,
        indicatorColor: Colors.white,
      ),
      backgroundColor: Colors.blue,
    ),
  ),
 );
}

Answer 1

你可以通过 SizedBox 包装 bottomNavigationBar，

bottomNavigationBar: SizedBox(height: 58, child: //some widget )