asScrollView method
      
SingleChildScrollView
asScrollView({ 
    
- Axis scrollDirection = Axis.vertical,
- bool reverse = false,
- EdgeInsetsGeometry? padding,
- bool? primary,
- ScrollPhysics? physics,
- ScrollController? controller,
转换为 SingleChildScrollView,支持滚动
Implementation
SingleChildScrollView asScrollView({
  Axis scrollDirection = Axis.vertical,
  bool reverse = false,
  EdgeInsetsGeometry? padding,
  bool? primary,
  ScrollPhysics? physics,
  ScrollController? controller,
}) {
  return SingleChildScrollView(
    scrollDirection: scrollDirection,
    reverse: reverse,
    padding: padding,
    primary: primary,
    physics: physics,
    controller: controller,
    child: this,
  );
}