class ClikBtnView extends StatefulWidget {
const ClikBtnView({super.key});
@override
State<ClikBtnView> createState() => _ClikBtnViewState();
}
class _ClikBtnViewState extends State<ClikBtnView> {
int countNum = 0;
List<String> _list = [];
@override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: .center,
children: [
Text("$countNum", style: TextStyle(fontSize: 32, fontWeight: .bold,backgroundColor: Colors.red)),
SizedBox(height: 10),
Row(
spacing: 5,
children: [
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
_list.add("我是一个新增的列表cell");
});
},
child: Text("增加列表数据"),
),
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
_list.removeLast();
});
},
child: Text("清空listview"),
),
],
),
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),),),
SizedBox(
width: .infinity,
height: 300,
child:
ListView(
children: _list.map((v){
return ListTile(title: Text(v),);
}
).toList(),
),
),
],
);
}
}
