小编Tri*_*ine的帖子

我想实现当用户拉动刷新时的行为，指示器不断旋转，直到以块模式从网络获取数据。事实上，我知道发生这种情况的原因，因为刷新方法立即返回。如何阻止此方法直到从网络获取数据。我如何等待数据来自网络。谢谢！

Future<void> _refresh() async{
    context.read<PostBloc>(RefreshEvent());
}

@override
Widget build(BuildContext context) {
  return BlocBuilder<PostBloc, PostStates>(builder: (context, state){
    switch (state.status){
      case PostStatus.failure:
        return const Center(child: Text('failed to fetch posts'));
      case PostStatus.success:
        if (state.posts.isEmpty) {
          return const Center(child: Text('no posts'));
        }
        return RefreshIndicator(
          triggerMode: RefreshIndicatorTriggerMode.onEdge,
          onRefresh: () async {
            await _refresh();
          },
          child: ListView.builder(
            physics:  AlwaysScrollableScrollPhysics(),
            itemBuilder: (context, index){
              if (index >= state.posts.length){
                return BottomLoader();
              }
              return PostListItem(post: state.posts[index]);
            },
            itemCount: state.hasReachedMax ? state.posts.length : state.posts.length + 1,
            controller: _scrollController,
          ),
        );
      case …

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          toolbarHeight: 50.0,          
          title: const Text(
            'This is the title !',
            style: TextStyle(color: Colors.black),
          ),
          backgroundColor: Colors.amber,
        ),
      ),
    ));