Flutter中的statefulWidget中的屏幕未更新

Question

我在Flutter中有一个statefulWidget，如下所示：

class GameScreen extends StatefulWidget {
@override
GameScreenState createState() => GameScreenState();
}
class GameScreenState extends State<GameScreen> {
List<String> selectedWord = ['h', 'e', 'l', 'l', 'o'];
Widget _letterInput() {
return Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
for (var letter in selectedWord) LetterInput(letter: letter)
],
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
_letterInput(),
],
)),
);
}
}
class LetterInput extends StatelessWidget {
LetterInput({this.letter});
final String letter;
@override
Widget build(BuildContext context) {
return Container(
padding: EdgeInsets.fromLTRB(5, 0, 5, 0),
decoration: BoxDecoration(
border: BorderDirectional(
bottom: BorderSide(width: 6.0, color: Colors.green))),
child: Text(letter,
textAlign: TextAlign.center,
style:
GoogleFonts.acme(fontSize: 28.0, fontWeight: FontWeight.w400)));
}
}

问题是，当我第一次用这个小部件启动应用程序时，我可以在屏幕上看到hello，但如果我继续并在selectedWord中将hello更改为hellos，这不会更新屏幕，即使打开了热加载，它仍然显示hello。我必须重新启动应用程序，这样它才会显示hellos。我该怎么解决这个问题？

Answer 1

根据我的经验，热重载保持状态。是否尝试热重启？

参考您的评论，如果您想继续使用热重载，我建议您将变量提取到小部件本身(如果这是您的一个选项(，如下所示：

class GameScreen extends StatefulWidget {
final List<String> selectedWord = ['h', 'e', 'l', 'l', 'o'];
@override
GameScreenState createState() => GameScreenState();
}
class GameScreenState extends State<GameScreen> {
Widget _letterInput() {
return Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
for (var letter in widget.selectedWord) LetterInput(letter: letter)
],
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
_letterInput(),
],
)),
);
}
}