import 'package:flutter/material.dart';
void main() {
runApp( MaterialApp(
home:MyApp()
)
);
}
class MyApp extends StatefulWidget {
MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
var total = 3;
var num = '완료!';
var a = 1;
var name=['정유성', '김민서', '김도연'];
var like=[0,0,0];
addName(){
setState(() {
name.add('말숙');
});
}
addOne(){
setState((){
total++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title : Text(total.toString()),),
floatingActionButton: FloatingActionButton(
child: Text(a.toString()),
onPressed: (){
showDialog(
context: context,
builder: (context){
return DialogUI(addOne : addOne, addName: addName);
});
},),
body: ListView.builder(
itemCount: name.length,
itemBuilder: (context, i){
return ListTile(
leading: Text(like[i].toString()),
title: Text(name[i]),
trailing: ElevatedButton(child: Text('좋아요'), onPressed: (){
setState(() {
like[i]++;
});
},),
);
},
),
bottomNavigationBar: BottomAppBar(),
);
}
}
class DialogUI extends StatelessWidget {
DialogUI({super.key, this.addOne, this.addName});
final addOne;
final addName;
var inputData = TextEditingController();
@override
Widget build(BuildContext context) {
return AlertDialog(
title: Text('Friend'),
content: SingleChildScrollView(
child: TextField(
controller: inputData,
decoration: InputDecoration(hintText: '친구이름'),
),
),
actions: [
TextButton(onPressed: (){addOne(); addName();}, child: Text('완료')),
TextButton(onPressed: (){Navigator.pop(context);}, child: Text('취소'))
],
);
}
}
말숙을 추가시키려고 완료버튼을 누르면
RangeError(index): Index out of range: index should be less than 3:3
에러가 뜹니다.
무엇이 문제일까요ㅜ
