Question

你好，我是新手。我已经对其进行了搜索，但是找不到适合我情况的解决方案。

我想给3个参数提供来自地图的Answer小部件值并分别列出。如果我从下面以及从Answer小部件构造函数中删除颜色，则下面的代码运行完美。

...(questions[_questionIndex]['answers'] as List<String>).map((answer) {
    return Answer(_answerQuestion, answer, color);
}).toList()

我要添加Answer小部件和下面的地图。如何在上述语句中映射3个参数？

class Answer extends StatelessWidget {
  final Function selectHandler;
  final String answerText;
  final Color color;

  Answer(this.selectHandler, this.answerText,this.color);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: double.infinity,
      child: RaisedButton(
        color: color,
        textColor: Colors.white70,
        child: Text(answerText),
        onPressed: selectHandler,
      ),
    );
  }
}

final questions = [
      {
        'questionText': 'What\'s your favorite color?',
        'answers': ['Black', 'Red', 'Green', 'White'],
        'colors': [Colors.black, Colors.red, Colors.green, Colors.white]
      },
      {
        'questionText': 'What\'s your favorite animal?',
        'answers': ['Rabbit', 'Snake', 'Elephant', 'Lion'],
      },
      {
        'questionText': 'Who\'s your favorite instructor?',
        'answers': ['Max', 'Max', 'Max', 'Max'],
      },
    ];

Answer 1

List>类型更改解决了该问题。

通过映射到多个键来创建小部件列表

1 个答案: