flutter系列之:flutter中可以建索引的栈布局IndexedStack( 二 ) _生活百科

class MyHomePage extends StatefulWidget {const MyHomePage({Key? key, required this.title}) : super(key: key);final String title;@overrideState<MyHomePage> createState() => _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> {int _counter = 0;void _changeIndex() {setState(() {_counter = (_counter+1) % 4;print(_counter);});}@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(widget.title),),body: Center(child: IndexedStack(index: _counter,children: [widgetOne(),widgetTwo(),widgetThree(),widgetFour(),],),),floatingActionButton: FloatingActionButton(onPressed: _changeIndex,tooltip: 'change index',child: const Icon(Icons.arrow_back),),);}程序运行之后的效果如下：