无法在Scaffold小部件后面堆叠图像

Question

我试图实现的UI我想添加一个图像背景。我的应用程序有bottomNavigatorBar属性，背景不在那里。只是卡在尸体上。我试着叠两个脚手架，但没用

    Stack(children: <Widget>[
      Scaffold(
              body: Image.asset('images/Opacity 80%.png',
        alignment: Alignment.bottomLeft,),
      ),Scaffold(
      extendBodyBehindAppBar: true,
      appBar: PreferredSize(
        preferredSize: Size.fromHeight(70.0),
        child: widget.pagenumber == 2
            ? InfoAppbar()
            : MyAppBar(_appBarlist[widget.pagenumber], controller, controller2),
      ),
      body: _children[widget.pagenumber],
      bottomNavigationBar: FancyBottomNavigation(
        initialSelection: widget.pagenumber,
        onTabChangedListener: onTapped,
        tabs: [
          TabData(
            iconData: Icons.gavel,
            title: 'Law',
          ),
          TabData(
            iconData: Icons.library_books,
            title: 'Handbook',
          ),
          TabData(iconData: Icons.info, title: 'Info'),
        ],
      ),
    ),
    ],);
  }

  void onTapped(int index) {
    setState(() {
      widget.pagenumber = index;
    });
  }}

Answer 1

Stack(children: <Widget>[
  Image.asset('images/Opacity 80%.png',)
  Scaffold(
  extendBodyBehindAppBar: true,
  appBar: PreferredSize(
    preferredSize: Size.fromHeight(70.0),
    child: widget.pagenumber == 2
        ? InfoAppbar()
        : MyAppBar(_appBarlist[widget.pagenumber], controller, controller2),
  ),
  body: _children[widget.pagenumber],
  bottomNavigationBar: FancyBottomNavigation(
    initialSelection: widget.pagenumber,
    onTabChangedListener: onTapped,
    tabs: [
      TabData(
        iconData: Icons.gavel,
        title: 'Law',
      ),
      TabData(
        iconData: Icons.library_books,
        title: 'Handbook',
      ),
      TabData(iconData: Icons.info, title: 'Info'),
    ],
  ),
),
],);

}

这可能会解决你的问题。不要使用脚手架