class ClikBtnView extends StatefulWidget {
const ClikBtnView({super.key});
@override
State<ClikBtnView> createState() => _ClikBtnViewState();
}
class _ClikBtnViewState extends State<ClikBtnView> {
int countNum = 0;
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: .center,
children: [
Text("$countNum", style: TextStyle(fontSize: 52, fontWeight: .bold)),
SizedBox(height: 100),
ElevatedButton(
onPressed: () {
setState(() {//StatefulWidget的情况下，调用该方法才会更新UI，会从新执行build方法
countNum++;
});
},
child: Text("增加"),
),
FloatingActionButton(onPressed: (){
setState(() {//StatefulWidget的情况下，调用该方法才会更新UI，会从新执行build方法
countNum++;
});
},child: Text("+",style: TextStyle(fontSize: 33),),),
],
),
);
}
}
