Flutter - 类型 List<Dynamic> 不是 Widget 类型的子类型

Question

我有一个使用 List 的程序，但出现此错误，如何解决？

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(children: [
        CustomScrollView(physics: BouncingScrollPhysics(), slivers: [
          _list(),
        ]),
      ]),
    );
  }

  _list() {
    return List.generate(
      actions.length,
      (i) => _card(actions[i]),
    );
  }


  _card(
String phrase,
  ) {
return SliverToBoxAdapter(
  child: Card(
    shape: RoundedRectangleBorder(
      side: BorderSide(color: Colors.black26, width: 0.1),
      borderRadius: BorderRadius.circular(10),
    ),
    margin: EdgeInsets.only(right: 50, left: 50, top: 20),
    child: InkWell(
      splashColor: Colors.black12,
      borderRadius: BorderRadius.circular(10),
      splashFactory: InkRipple.splashFactory,
      onTap: () => _speak(phrase),
      child: Column(children: <Widget>[
        SizedBox(height: 15.0),
        Padding(
          padding: EdgeInsets.only(left: 15, right: 15),
          child: Text(
            phrase,
            style: TextStyle(
                fontFamily: 'Circular',
                fontSize: 17.0,
                color: Colors.grey[800]),
          ),
        ),
        SizedBox(height: 15.0),
      ]),
    ),
  ),
);
  }

Answer 1

您的方法_list() 返回一个List<Widget>。

因此，您应该删除CustomScrollView 中的括号：

CustomScrollView(physics: BouncingScrollPhysics(), slivers: _list()),