Flutter - 如何让 SnackBar 不向上推动 FloatingActionButton？

Question

如何让Snackbar与FloatingActionButton重叠，弹出时不向上推？我附上了我的简化代码以供参考。提前谢谢你。

class Screen extends StatefulWidget{

  @override
  State<StatefulWidget> createState() => ScreenState();
}

class ScreenState extends State<Screen>{

  BuildContext context;

  @override
  Widget build(BuildContext context) => Scaffold(
    floatingActionButton: FloatingActionButton(
      onPressed: action,
    ),
    body: Builder(
      builder : (BuildContext context){
        this.context = context;
        return Container();
      }
    )
  );

  action() => Scaffold.of(context).showSnackBar(SnackBar(
    duration: Duration(milliseconds : 1000),
    content: Container(height: 10)
  ));
}

Answer 1

只需使用多个Scaffolds。用外层包裹内层。用inner把一切都归于它，body、appBar、bottomNavigationBar、floatingActionButton等等。从外部的body 的BuildContext 呼叫showSnackBar。如果有的话，将drawer 从内移到外，使其保持在SnackBar 之上。

如果您喜欢像经典吐司一样弹出SnackBar，请参阅 Siddharth Patankar 的回答。也谢谢你。

以下是我的答案的简化代码。

  @override
  Widget build(BuildContext context) => Scaffold(
    drawer : Drawer(child: Container()),
    body: Builder(
      builder : (BuildContext context){
        this.context = context;
        return Scaffold(
          body: Container(),
          floatingActionButton: FloatingActionButton(
            onPressed: () => Scaffold.of(context).showSnackBar(SnackBar(
              duration: Duration(milliseconds : 1000),
              content: Container(height: 30),
            )),
          ),
        );
      }
    )
  );

Answer 2

您可以将SnackBar 的behavior 属性设置为SnackBarBehavior.floating，这将在其他小部件上方显示Snackbar。

应该这样做 -

class Screen extends StatefulWidget{

  @override
  State<StatefulWidget> createState() => ScreenState();
}

class ScreenState extends State<Screen>{

  BuildContext context;

  @override
  Widget build(BuildContext context) => Scaffold(
    floatingActionButton: FloatingActionButton(
      onPressed: action,
    ),
    body: Builder(
      builder : (BuildContext context){
        this.context = context;
        return Container();
      }
    )
  );

  action() => Scaffold.of(context).showSnackBar(SnackBar(
    duration: Duration(milliseconds : 1000),
    content: Container(height: 10)
    behavior: SnackBarBehavior.floating, // Add this line
  ));
}

有关详细信息，请参阅this 链接。