flutter - 你能有一个带有透明应用栏和底部应用栏的可滑动标签吗？

Question

我正在尝试构建一个具有透明应用栏和底部应用栏的颤动布局。但是，我希望能够在选项卡之间滑动。问题是我可以有可滑动的标签，但主体不位于应用栏下方。或者我可以将主体放在应用栏下方，但标签不可滑动。

我已经尝试过使用 Stack() 而不是 Scaffold() 的实现。但是我认为这会将 TabBarView 放在应用栏的前面，因为无法区分正文和应用栏。

这是应用栏不可见的代码：

class _AppStateTab extends State<App>{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3,
        child: Stack(
          children: <Widget>[
            Positioned(
              top: 0.0,
              left: 0.0,
              right: 0.0,
              child: AppBar(
                backgroundColor: Colors.transparent,
                elevation: 0.0,
                actions: <Widget>[
                  IconButton(
                    icon: Icon(Icons.search), 
                    color: Colors.white,
                    onPressed: () {},
                  ),
                  IconButton(
                    icon: Icon(Icons.cached), 
                    color: Colors.white,
                    onPressed: () {},
                  ),
                ],
              ),
            ),
            Positioned(
              bottom: 0.0,
              left: 0.0,
              right: 0.0,
              child: BottomAppBar(
                color: Colors.transparent,
                elevation: 0.0,
                child: Row(
                  mainAxisSize: MainAxisSize.max,
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: <Widget>[
                    IconButton(
                      icon: Icon(Icons.dialpad), 
                      color: Colors.white,
                      onPressed: (){},
                    ),
                    IconButton(
                      icon: Icon(Icons.camera_alt),
                      color: Colors.white,
                      onPressed: (){},
                    ),
                    IconButton(
                      icon: Icon(Icons.edit),
                      color: Colors.white,
                      onPressed: (){},
                    ),
                  ],
                ),
              ),
            ),
            TabBarView(
              children: <Widget>[
                Calculator(),
                Camera(),
                Solution(),
              ],
            )
          ],
        ),
      ),
    );
  }
}

这是正文不会在应用栏下方移动的代码：

  @override
  Widget build(BuildContext context){
    return Scaffold(
      appBar: AppBar(
        title: Text('data'),
        backgroundColor: Colors.transparent,
        elevation: 0.0,
      ),
      body: TabBarView(
        controller: _tabController,
        children: _tabList,
      ),
      bottomNavigationBar: BottomAppBar(
        color: Colors.transparent,
        elevation: 0.0,
        child: Row(
          mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: <Widget>[
            IconButton(
              icon: Icon(Icons.dialpad), 
              color: Colors.white,
              onPressed: (){
                _tabController.animateTo(0);
              },
            ),
            IconButton(
              icon: Icon(Icons.camera_alt),
              color: Colors.white,
              onPressed: (){
                _tabController.animateTo(1);
              },
            ),
            IconButton(
              icon: Icon(Icons.edit),
              color: Colors.white,
              onPressed: (){
                _tabController.animateTo(2);
              },
            ),
          ],
        ),
      ),
    );

标签： fluttertransparencyflutter-appbar

Answer 1

Okay just an update, I managed to fix my issue. I didn't realise the order within a stack determined it's layer so to speak. The first item is at the very back and each other item goes one layer infront. So to fix this all I did was rearranged the body to be the first item and have the positioneds follow it. This allowed for a swipable app with transparent app bars.