Flutter Cards-如何在Flutter中循环卡片小部件

Question

主镖

我想在卡片上循环播放。由于在Angular 2中，* ngFor现在可以以相同的方式正常工作，如何循环播放。我没有在卡片网上找到文档。您将在屏幕快照中找到输出。请帮助我了解如何循环显示卡或任何其他小部件

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        home:new MyCard()
    );
  }
}
class MyCard extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    Widget allcards;
      return new Scaffold(
            appBar: new AppBar(
              title: new Text('My First App'),
              backgroundColor:new Color(0xFF673AB7),
            ),
            body: new Container(
              child: new Column(
                children: <Widget>[
                  new Card(
                    child: new Column(
                      children: <Widget>[
                        new Image.network('https://i.ytimg.com/vi/fq4N0hgOWzU/maxresdefault.jpg'),
                        new Padding(
                          padding: new EdgeInsets.all(7.0),
                          child: new Row(
                            children: <Widget>[
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Icon(Icons.thumb_up),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Text('Like',style: new TextStyle(fontSize: 18.0),),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Icon(Icons.comment),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Text('Comments',style: new TextStyle(fontSize: 18.0)),
                             )

                            ],
                          )
                        )
                      ],
                    ),
                  )
                ],
              ),

            )

        );

    }
}`

这是我的飞镖文件屏幕截图

Answer 1

就像Angular2具有可迭代的循环一样，这使得任何循环都可以工作。

因此，我在您的代码中进行了一些重构，并添加了一个列表，Column并用进行了更改，ListView结果如下：

  class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        home:new MyCard()
    );
  }
}
class MyCard extends StatelessWidget{
  List cards = new List.generate(20, (i)=>new CustomCard());
  @override
  Widget build(BuildContext context) {
      return new Scaffold(
            appBar: new AppBar(
              title: new Text('My First App'),
              backgroundColor:new Color(0xFF673AB7),
            ),
            body: new Container(
              child: new ListView(
                children: cards,
              )

            )

        );

    }
}

class CustomCard extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
              return  new Card(
                    child: new Column(
                      children: <Widget>[
                        new Image.network('https://i.ytimg.com/vi/fq4N0hgOWzU/maxresdefault.jpg'),
                        new Padding(
                          padding: new EdgeInsets.all(7.0),
                          child: new Row(
                            children: <Widget>[
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Icon(Icons.thumb_up),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Text('Like',style: new TextStyle(fontSize: 18.0),),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Icon(Icons.comment),
                             ),
                             new Padding(
                               padding: new EdgeInsets.all(7.0),
                               child: new Text('Comments',style: new TextStyle(fontSize: 18.0)),
                             )

                            ],
                          )
                        )
                      ],
                    ),
                  );
  }
}