Flutter/Dart: Customize Bottom Navigation Bar height

You can create your own widget

 Widget customBottomNavigationBar(BuildContext context){
    double myHeight =100.0;//Your height HERE
    return SizedBox(
    height: myHeight,
    width: MediaQuery.of(context).size.width,
    child: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,
          ),
    );
}

@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: customBottomNavigationBar(context),
      backgroundColor: Colors.blue,
    ),
  ),
);
}

I set BottomNavigationBar( selectedFontSize: 0.0, unselectedFontSize: 0.0). And then I wrap BottomNavigationBar widget with SizedBox( height: 50). It works for me. Hope it works for u guys too…🙂

I had the same problem, the BottomNavigationBar's height can't be override, my solution was resized the icons using SizedBox, it does decrease the height, other final solution was update the font size of title property, this my example:

new BottomNavigationBarItem(
              icon:new SizedBox(
                child: new IconButton(
                    icon: new Image.asset("assets/images/icon_ar.png"),
                    onPressed: () {}),
                width: 38,
                height: 38,
              ),
              title: new Text("", style: new TextStyle(fontSize: 0),))

This does my BottomNavigationBar had a size standard in both platforms.

You can wrapper bottomNavigationBar by SizedBox,

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