效果图
壹、控件分解图
贰、代码实现
贰点壹、构建根布局
新建AdPictureWidget继承自StatefulWidget,新建_AdPictureWidgetState类继承自State<AdPictureWidget>,根布局为Stack,代码如下:
class AdPictureWidget extends StatefulWidget {
@override
_AdPictureWidgetState createState() => _AdPictureWidgetState();
}
class _AdPictureWidgetState extends State<