问题是我无法将我自己的类ForceSelection值的值从另一个屏幕传递到另一个屏幕的StatefulWidget。它在StatelessWidget中工作正常。我试图从这个颤动的教程中学习:https://flutter.dev/docs/cookbook/navigation/passing-data#4-navigate-and-pass-data-to-the-detail-screen
我在levelSelection.dart中有这种类
class ForceSelection {
final String forceSelection;
final String langSelection;
ForceSelection(this.forceSelection, this.langSelection);
}
我试图将值传递给下一个文件PlayQuiz.dart
Game(forceSelection: ForceSelection('maa', 'fin'))
game.dart看起来像这样:
class Game extends StatelessWidget {
final ForceSelection forceSelection;
Game({Key key, @required this.forceSelection}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: forceSelection.langSelection, // TODO should work and change later
theme: new ThemeData(
primaryColor: Colors.white,
),
home: PlayQuiz(),
);
}
}
我想将ForceSelection值传递给PlayQuiz()
class PlayQuizState extends State<PlayQuiz> {
Game.forceSelection // <--- How can I get the value out of here?
}
class PlayQuiz extends StatefulWidget {
@override
PlayQuizState createState() => new PlayQuizState();
}
整个代码可以在这里找到:https://pastebin.com/nKssz42R和levelSelection.dart:https://pastebin.com/8QbBD0A2
试试这个代码
在PlayQuiz()中添加了forceSelecton参数
class Game extends StatelessWidget {
final ForceSelection forceSelection;
Game({Key key, @required this.forceSelection}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: forceSelection.langSelection, // TODO should work and change later
theme: new ThemeData(
primaryColor: Colors.white,
),
home: PlayQuiz(forceSelection),
);
}
}
在游戏测验中
class PlayQuiz extends StatefulWidget {
final ForceSelection forceSelection;
PlayQuiz(this.forceSelection);
@override
PlayQuizState createState() => new PlayQuizState(forceSelection);
}
在PlayQuizState中
class PlayQuizState extends State<PlayQuiz> {
ForceSelection forceSelection;
PlayQuizState(ForceSelection forceSelection) {
this.forceSelection = forceSelection;
}
}