相关疑难解决方法(0)

我在 flutter 中使用动画列表加载列表类，在添加或删除项目时，动画有效，但当列表最初加载时，动画不起作用。有没有办法在最初加载列表时为项目设置动画。

class AnimationTest extends StatefulWidget {
  @override
  _AnimationTestState createState() => _AnimationTestState();
}

class _AnimationTestState extends State<AnimationTest> with SingleTickerProviderStateMixin {
  AnimationController _controller;

  @override
  void initState() {
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 1),
    );
    super.initState();
  }

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

  @override
  Widget build(BuildContext context) {
    return AnimatedList(
      key: _listKey,
      initialItemCount: 3,
      itemBuilder: (BuildContext context, int index, Animation animation) {
        return SlideTransition(
          position: animation.drive(Tween<Offset>(begin: Offset(1.0, 0.0), end: Offset.zero)
              .chain(CurveTween(curve: Curves.decelerate))),
          child: Row(
            children: <Widget>[
              Expanded( …