使用“StreamBuilder”子项切换 "TabBarView" 时出现黑屏

Question

当您切换回标签页时出现黑屏，有人知道为什么吗？

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatelessWidget(),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      initialIndex: 1,
      length: 3,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('TabBar Widget'),
          bottom: const TabBar(
            tabs: <Widget>[
              Tab(
                icon: Icon(Icons.cloud_outlined),
              ),
              Tab(
                icon: Icon(Icons.beach_access_sharp),
              ),
              Tab(
                icon: Icon(Icons.brightness_5_sharp),
              ),
            ],
          ),
        ),
        body: TabBarView(
          children: <Widget>[
            StreamBuilder(
              stream: Stream.value(true),
              builder: (context, snapshot) {
                return const Center(child: Text("It's cloudy here"));
              },
            ),
            StreamBuilder(
              stream: Stream.value(true),
              builder: (context, snapshot) {
                return const Center(child: Text("It's rainy here"));
              },
            ),
            StreamBuilder(
              stream: Stream.value(true),
              builder: (context, snapshot) {
                return const Center(child: Text("It's sunny here"));
              },
            ),
          ],
        ),
      ),
    );
  }
}

Answer 1

我认为这个类似的问题虽然都抛出相同的错误

你可以在那里找到关于这个问题的一些很好的解释。

这个问题可以用initialData: true,代替stream.

StreamBuilder(
  initialData: true,
  //...
),

如果你也可以使用 StreamController 添加 broadcast 像 StreamController<T>.broadcast().

你可以关注.

使用“StreamBuilder”子项切换 "TabBarView" 时出现黑屏

Black screen when switching "TabBarView" with `StreamBuilder` children

flutter

flutter-layout