import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Woolha.com Flutter Tutorial', home: FutureBuilderExample(), debugShowCheckedModeBanner: false, ); } } Future...
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Flutter makes it easy and fast to build beautiful apps for mobile and beyond - fix a bug for futurebuilder, example: · flutter/flutter@f84139b
error;/// Returns whether this snapshot contains a non-null [data] value./// This can be false even when the asynchronous computation has completed/// successfully, if the computation did not return a non-null value. For/// example, a [Future<void>] will complete with the null value ...
在创建新的FutureBuilder对象时,我们将Future对象作为要处理的异步计算传递。...在构建器函数中,我们检查connectionState的值,并使用AsyncSnapshot中的数据或错误返回不同的窗口小部件。...https://flutter-academy.com/async-in-flutter-futurebuilder/ FutureBuilder的使用?
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/// example, a [Future<void>] will complete with the null value even if it /// completes successfully. bool get hasData => data != null; /// Returns whether this snapshot contains a non-null [error] value. /// /// This is always true if the asynchronous computation's last resul...
Future 结束时调用 State.setState 以便让 Widget 重建。Flutter 流水线决定如何调用 builder 回调,该回调接收一个跟时间无关的、代表 Future 交互过程的 snapshot 序列 (receive a timing-dependent sub-sequence of the snapshots that represent the interaction with the future) ...
Future 结束时调用State.setState以便让 Widget 重建。Flutter 流水线决定如何调用builder回调,该回调接收一个跟时间无关的、代表 Future 交互过程的 snapshot 序列 (receive a timing-dependent sub-sequence of the snapshots that represent the interaction with the future) ...
我FutureBuilder在 Flutter 中遇到一个问题,它会Future在每次小部件重建时重新创建它,从而导致我的应用程序出现意外行为。 具体来说,我有一个FutureBuilder获取随机数的方法,但每次触发重建(例如,通过按下按钮更新计数器)时,它都会生成一个新的随机数,而不是使用最初获取的值。