Question

是否可以在ListView.builder内使用CustomScrollView（或类似的东西）？我有这样的CustomScrollView：

return Scaffold(
  body: CustomScrollView(
    slivers: [
      SliverAppBar(...),
      SliverList(delegate: SliverChildListDelegate(children))
    ],
  ),
);

这很好用，但是在我的实际情况下，列表可能包含成千上万个项目，因此我不想将它们全部传递给SliverChildListDelegate。我想使用ListView.builder（或类似的东西）来构建滚动到视图中的项目。我期望.builder或SliverList上有一个SliverChildListDelegate构造函数，但我看不到任何类似的东西。我想念什么吗？

Answer 1

这对我有用，我可以拥有一个SliverAppBar

return CustomScrollView(
      slivers: [
        SliverAppBar(
        ),
        SliverList(
            delegate: SliverChildListDelegate([
          SingleChildScrollView(
            child: Column(
              children: [
                Container(
                  child: ListView.builder(
                    shrinkWrap: true,
                    physics: NeverScrollableScrollPhysics(),
                    itemBuilder: (BuildContext context, int index) {

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

Answer 2

delegate的{{1}}参数不一定是SliverList。

您还可以使用SliverChildListDelegate来达到SliverChildBuilderDelegate的{{1}}效果

builder

Answer 3

您可以使用List.generate作为下面的示例

   author_books GET    /authors/:author_id/books(.:format)      books#index
                POST   /authors/:author_id/books(.:format)      books#create
new_author_book GET    /authors/:author_id/books/new(.:format)  books#new
      edit_book GET    /books/:id/edit(.:format)                books#edit
           book GET    /books/:id(.:format)                     books#show
                PATCH  /books/:id(.:format)                     books#update
                PUT    /books/:id(.:format)                     books#update
                DELETE /books/:id(.:format)                     books#destroy
        authors GET    /authors(.:format)                       authors#index
                POST   /authors(.:format)                       authors#create
     new_author GET    /authors/new(.:format)                   authors#new
    edit_author GET    /authors/:id/edit(.:format)              authors#edit
         author GET    /authors/:id(.:format)                   authors#show
                PATCH  /authors/:id(.:format)                   authors#update
                PUT    /authors/:id(.:format)                   authors#update
                DELETE /authors/:id(.:format)                   authors#destroy
          books GET    /books(.:format)                         books#index
                POST   /books(.:format)                         books#create
       new_book GET    /books/new(.:format)                     books#new

Answer 4

我不确定如何在CustomScrollView中完成此操作，但是您可以尝试以下操作：

Scaffold(
      body: NestedScrollView(
        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
          return <Widget>[
            SliverAppBar(...),
          ];
        },
        body: ListView.builder(..),)
);

是否可以在CustomScrollView中使用ListView.builder？

4 个答案: