异步生成器函数需要配合async*关键字和yield关键字,最终返回的是一个Stream对象,需要注意的是「生成Stream也是一个单一订阅模型的Stream,」也就是说不能同时存在多个订阅者监听否则会出现异常,如果要实现支持多个监听者通过asBroadcastStream转换成一个广播订阅模型的Stream。 import 'dart:io'; void main() { Stream<...
如果你使用过flutter_bloc,会用到async*,现在再来看,是不是更清楚了一点。 代码语言:javascript 复制 class CounterBloc extends Bloc<CounterEvent, int> { @override int get initialState => 0; @override Stream<int> mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.de...
import 'dart:async'; import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: Scaffold( appBa...
async* Stream yield、yield* 、await 下面就用几个emoji,认识一下这几个关键字吧 一、多元素同步函数生成器 1.sync*和yield sync*是一个dart语法关键字。它标注在函数{ 之前,其方法必须返回一个 Iterable对象 本文参与腾讯云自媒体同步曝光计划,分享自作者个人站点/博客。
I/flutter ( 7129): tian.shm =15 I/flutter ( 7129): tian.shm =22 sync* yield* 应用场景 同步 返回类型Iterable<T> ,相对于async* yield ,yield* 后面必须是一个Iterable<T> ,yield 则必须是T , test(){test_yield().forEach((element){printString(element);});}Iterable<int>test_yield()syn...
(terminate "flutter run" but leave application running). c Clear the screen q Quit (terminate the application on the device). A Dart VM Service on 22041216UC is available at: http://127.0.0.1:58453/OsfCjFpuPGg=/ The Flutter DevTools debugger and profiler on 22041216UC is available at: ...
ResizeImage's obtain key wraps the child ImageProvider's key in its own key. When the child key is obtained synchronously, this wrapping causes it to complete on the next frame, which causes a flicker in the image. Tests Tests handling of sync and async obtainKey Checklist Before you creat...
Flutter Package: A Redux version tailored for Flutter, which is easy to learn, to use, to test, and has no boilerplate. Allows for both sync and async reducers. - andibardhi/async_redux
decoding: 'async', }, urlPath: '/assets/img/', outputDir: '_site/assets/img/', sharpOptions: { animated: true, }, }); } eleventyConfig.setQuietMode(true); Expand Down 2 changes: 1 addition & 1 deletion 2 examples/analysis/pubspec.yaml Show comments View file Edit file Delete ...