Question

我总共有 10 个小时的编码经验，所以请原谅我的无知。在 TODO 下，它应该是（这是教程显示的内容）return null; 而不是 throw UnimplementedError();

这是我所拥有的副本。

void main() => runApp(MyQuizApp());


class MyQuizApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    throw UnimplementedError();
  }
}

class MyQuizAppState extends State<MyQuizApp> {
  var questionIndex = 0;

  void answerQuestion() {
    questionIndex = questionIndex + 1;
    print(questionIndex);
  }

  @override
  Widget build(BuildContext context) {
    var questions = [
      "What\'s your favorite color?",
      "What\'s your favorite fruit?",
    ];
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Personality Quiz"),
        ),
        body: Column(
          children: [
            Text(questions[questionIndex]),
            RaisedButton(
              child: Text("Answer 1"),
              onPressed: answerQuestion,
            ),
            RaisedButton(
              child: Text("Answer 2"),
              onPressed: () => print("Answer chosen!"),
            ),
            RaisedButton(
              child: Text("Answer 3"),
              onPressed: () {
                print("Answer chosen!");
              },
            ),
          ],
        ),
      ),
    );
  }
}

Answer 1

这应该可以解决它！

class MyQuizApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    _MyQuizAppState createState() => _MyQuizAppState();
  }
}

(FLUTTER) 我遇到了这个问题： throw UnimplementedError();

1 个答案: