将变量传递给子部件 FLUTTER

Question

我有带有 ListView Builder 的容器，子小部件放在单独的文件中。

itemCount: articles.length,
itemBuilder: (context, index ) => allRadioList(articles[index], context),

我的子插件：

Widget allRadioList(Article article, BuildContext context) {
  return Card(
      child: ListTile(
    title: Text(article.title),
    subtitle: Text(STRING VARIABLE),
    leading: CircleAvatar(backgroundImage: NetworkImage("https://image.tmdb.org/t/p/w300/${article.urlToImage}")),
    trailing: IconButton(
      icon: const Icon(Icons.star_border_outlined),
      tooltip: 'Increase volume by 10',
      onPressed: () {},
    ),
  ));

我如何在父级的子 allRadioList 小部件中传递 IE STRING VARIABLE？

Answer 1

向您的 builder 函数添加一个新参数：

Widget allRadioList(
  Article article, 
  BuildContext context,
  String text, // <-- New variable
) {
  return <...>;
}

将变量传递给构建器：

final text = 'Test';

<...>

itemCount: articles.length,
itemBuilder: (context, index ) => allRadioList(
  articles[index],
  context,
  text, // <-- Pass variable
),

在代码中使用传递的值：

Widget allRadioList(
  Article article, 
  BuildContext context,
  String text,
) {
  return Card(
      child: ListTile(
    title: Text(article.title),
    subtitle: Text(text), // <-- Use the passed value
    leading: CircleAvatar(backgroundImage: NetworkImage("https://image.tmdb.org/t/p/w300/${article.urlToImage}")),
    trailing: IconButton(
      icon: const Icon(Icons.star_border_outlined),
      tooltip: 'Increase volume by 10',
      onPressed: () {},
    ),
  ));

将变量传递给子部件 FLUTTER

Pass variable to child widget FLUTTER

variables

flutter

flutter-listview