Flutter连续播放图片动画。

说明

采用IndexedStack，效果比较顺滑。

一个 Flutter 项目，里面采用了此效果。

// 播放图片动画
class AnimationImages extends StatefulWidget {
  final List<Image> images;
  AnimationImages(this.images);
  @override
  _AnimationImagesState createState() => _AnimationImagesState();
}
class _AnimationImagesState extends State<AnimationImages> {
  // 显示的 image
  int showIndex = 0;
  bool _disposed;
  @override
  void initState() {
    super.initState();
    _disposed = false;
    Future.delayed(Duration(milliseconds: 200), () {
      _updateImage(widget.images.length, Duration(milliseconds: 40));
    });
  }
  _updateImage(int count, Duration millisecond) {
    Future.delayed(millisecond, () {
      if (_disposed) return;
      setState(() {
        showIndex = widget.images.length - count--;
      });
      if (count < 1) {
        count = widget.images.length;
      }
      _updateImage(count, millisecond);
    });
  }
  @override
  void dispose() {
    super.dispose();
    _disposed = true;
  }
  @override
  Widget build(BuildContext context) {
    return Center(
      child: IndexedStack(
        index: showIndex,
        children: widget.images,
      ),
    );
  }
}