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在这里插入代码片## 1.Scaffold.of() called with a context that does not contain a Scaffold.
错误出现的场景: 使用Navigator 从第二个页面向第一个页面返回值
class HomePage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('我是第一个页面'),),body: Center(child: Column(children: <Widget>[RaisedButton(child: Text('点我进入下一页面'),onPressed: (){_navigateToSecondPage(context);},)],),),);}_navigateToSecondPage(BuildContext context) async {final result = await Navigator.push(context, MaterialPageRoute(builder: (context)=> SecondPage(),));Scaffold.of(context).showSnackBar(SnackBar(content: Text('$result'),));}
}
修改后
class HomePage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('我是第一个页面'),),body: Center(child: Column(children: <Widget>[RaiseMyButton()],),),);}
}class RaiseMyButton extends StatelessWidget{@override Widget build(BuildContext context) {// TODO: implement buildreturn Column(children: <Widget>[RaisedButton(child: Text('点我进入下一页面'),onPressed: (){_navigateToSecondPage(context);},)], );}_navigateToSecondPage(BuildContext context) async {final result = await Navigator.push(context, MaterialPageRoute(builder: (context)=> SecondPage(),));Scaffold.of(context).showSnackBar(SnackBar(content: Text('$result'),));}
}
原因: of method
需要将RaiseButton剥离出来,因为build方法如果嵌套build后,接收不到外层的context参数
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