Flutter Rive 多状态例子

官方的状态例子写的看的很难晕

试过动态修改构造函数的 animation, controller ,stateMachine 都不行，
后面 尝试 下面这种写法，可以

class LoginAnim extends StatefulWidget {
  const LoginAnim({Key? key}) : super(key: key);

  @override
  State createState() => _LoginAnimState();
}

class _LoginAnimState extends State {


  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ElevatedButton(onPressed: (){
          _hitHand();
        }, child: Text("handUp")),
        ElevatedButton(onPressed: (){
          _hitBump();
        }, child: Text("handDown")),
        _buildAnim(),
      ],
    );
  }
  SizedBox _buildAnim() {
    return SizedBox(
      height: 280,
      child: RiveAnimation.asset(
        RivLoginAnim.name,
        onInit: _onRiveInit,
      ),
    );
  }
  Artboard? _artBoard;
  void _onRiveInit(Artboard artBoard) {
    _artBoard = artBoard;
  }

  void _hitBump() {
    super.setState(() {
      _artBoard?.addController(SimpleAnimation(RivLoginAnim.hands_down));
    });

  }
  void _hitHand() {
    super.setState(() {
      _artBoard?.addController(SimpleAnimation(RivLoginAnim.hands_up));
    });

  }

  @override
  void dispose() {
    super.dispose();
  }
}```



动态addController 可以刷新