找到了解决方案。Stepper已经是可滚动的小部件，并且当我在ListView中添加Stepper时，它已成为另一个Scrollable小部件中的Scrollable小部件。
来自Gitter的@FunMiles建议使用NestedScrollView小部件而不是ListView＆解决了我的问题。
class TestAppHomePage extends StatefulWidget { @override TestAppHomePageState createState() => new TestAppHomePageState();}class TestAppHomePageState extends State<TestAppHomePage> with TickerProviderStateMixin { ScrollController _scrollController = new ScrollController(); @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text('Test Title'), elevation: 0.0, ), body: new NestedScrollView( controller: _scrollController, headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) { return <Widget>[ new SliverList( delegate:new SliverChildListDelegate(<Widget>[ new MyContents(), new MyContents(), new MyContents(), new MyContents(), ]), ), ]; }, body: new SimpleWidget(), ), ); }}
