# AnimationController

{{tag>flutter animation controller}}


`setState(() {});` 이것 안했다가, 삽질 몇시간을 날려버림...

<code dart>
class _AddBookCardState extends State<AddBookCard>
    with TickerProviderStateMixin {
  double bottom = 0;
  AnimationController animationController;
  Animation<double> animation;
  Animation curve;
  bool mounted = true;

  @override
  void initState() {
    super.initState();
    print('_AddBookCardState init ${widget.idx}');

    animationController =
        AnimationController(duration: const Duration(seconds: 2), vsync: this);
    curve = CurvedAnimation(parent: animationController, curve: Curves.easeOut);
    animation = Tween<double>(begin: 0, end: 200).animate(curve);

    animationController.addListener(() {
      setState(() {});
    });
  }
  
  @override
  void dispose() {
    print('_AddBookCardState dispose ${widget.idx}');

    animationController?.dispose();
    super.dispose();

    mounted = false;
  }

</code>