forked from lxm_flutter/FlutterUnit
55 lines
1.4 KiB
Dart
55 lines
1.4 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-29
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 172,
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// "name": 'FutureBuilder基本使用',
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// "priority": 1,
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// "subtitle":
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// "【builder】 : 子组件 【AsyncWidgetBuilder<T>】\n"
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// "【initialData】 : 初始数据 【T】\n"
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// "【future】 : 异步任务 【Future<T>】",
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// }
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class CustomFutureBuilder extends StatefulWidget {
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@override
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_CustomFutureBuilderState createState() => _CustomFutureBuilderState();
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}
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class _CustomFutureBuilderState extends State<CustomFutureBuilder> {
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Future<String> _future;
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@override
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void initState() {
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_future = loadData();
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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return Container(
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child: FutureBuilder(
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initialData: 'Load',
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future: _future,
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builder: (ctx, snap) {
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if (snap.connectionState == ConnectionState.done) {
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return Text(snap.data);
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}
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if (snap.connectionState == ConnectionState.waiting) {
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return CircularProgressIndicator();
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}
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if (snap.hasError) {
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return Text('Error');
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}
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return Container();
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}),
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);
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}
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Future<String> loadData() async {
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await Future.delayed(Duration(seconds: 2));
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return 'LoadeSuccess';
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}
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}
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