在 Flutter 中一切皆是 组件，仅仅 Widget 的子类和间接子类就有 350 多个，整理的 Flutter组件继承关系图 可以帮助大家更好的理解学习 Flutter，回归正题，如此多的组件到
组件树
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',theme: ThemeData(
),home: Scaffold(
body: Text('老孟'),),);
}
}
Scaffold(
body: Center(
child: Text('老孟'),)
Scaffold(
appBar: AppBar(),body: Center(
child: Text('老孟'),)
class StatelessWidgetDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container();
}
}
class StatefulWidgetDemo extends StatefulWidget {
@override
_StatefulWidgetDemoState createState() => _StatefulWidgetDemoState();
}
class _StatefulWidgetDemoState extends State<StatefulWidgetDemo> {
@override
Widget build(BuildContext context) {
return Container();
}
}
Material vs Cupertino
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