Flutter - Change the animation of TabBarView

Disable animation between flutter tabs by setting animation duration to zero like this

    tabController = TabController(
    animationDuration: Duration.zero,
    length: 4, vsync: this, initialIndex: 0);

Thank me later.

I don't know if you want to completely change the animation.

But if you just need some customization, did you try to use a TabController instead of a DefaultTabController ? You just need to pass the tabController as an arg to the TabBar & TabBarView.

To customize the animation with the tabController, you should specify an Animation for the tabController and also specify the curve and duration with the animateTo function of the tabController.

https://api.flutter.dev/flutter/material/TabController/animateTo.html https://api.flutter.dev/flutter/material/TabController-class.html

This is not hard, just use TabController (to do so you need to use SingleTickerProviderStateMixin ) and AnimatedBuilder.

class MyApp2 extends StatefulWidget {
  @override
  _MyApp2State createState() => _MyApp2State();
}

class _MyApp2State extends State<MyApp2> with SingleTickerProviderStateMixin {
  TabController _tabController;

  @override
  void initState() {
    _tabController = TabController(length: 4, vsync: this);
    super.initState();
  }

  _tabBarView() {
    return AnimatedBuilder(
      animation: _tabController.animation,
      builder: (BuildContext context, snapshot) {
        return Transform.rotate(
          angle: _tabController.animation.value * pi,
          child: [
            Container(
              color: Colors.blue,
            ),
            Container(
              color: Colors.orange,
            ),
            Container(
              color: Colors.lightGreen,
            ),
            Container(
              color: Colors.red,
            ),
          ][_tabController.animation.value.round()],
        );
      },
    );
  }

  _bottomTabBar() {
    return TabBar(
      controller: _tabController,
      labelColor: Colors.black,
      tabs: [
        Tab(
          icon: new Icon(Icons.home),
        ),
        Tab(
          icon: new Icon(Icons.public),
        ),
        Tab(
          icon: new Icon(Icons.group),
        ),
        Tab(
          icon: new Icon(Icons.person),
        )
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 4,
      child: Scaffold(
        appBar: AppBar(title: const Text('Bottom App Bar')),
        body: _tabBarView(),
        bottomNavigationBar: _bottomTabBar(),
      ),
    );
  }
}

Screenshot (Null safe):

---

Code:

If you want fine-grained control, you can make use of the AnimationController.

class _MyPageState extends State<MyPage> with TickerProviderStateMixin {
  late final TabController _tabController;
  late final AnimationController _controller;

  @override
  void initState() {
    super.initState();

    _controller = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 400),
      value: 1,
    );

    _tabController = TabController(
      length: 3,
      vsync: this,
    )..addListener(() {
        if (_tabController.indexIsChanging) {
          setState(() => _controller.forward(from: 0.5));
        }
      });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ScaleTransition(
        scale: _controller,
        child: [
          Container(color: Colors.red),
          Container(color: Colors.green),
          Container(color: Colors.blue),
        ][_tabController.index],
      ),
      bottomNavigationBar: TabBar(
        controller: _tabController,
        tabs: [
          Tab(child: Text('Red')),
          Tab(child: Text('Green')),
          Tab(child: Text('Blue')),
        ],
      ),
    );
  }
}