flutter中单例的写法
| class AccountManager { |
| factory AccountManager() => _instance ??= AccountManager._(); |
| |
| |
| static void destroyInstance() => _instance = null; |
| } |
flutter 页面路由
利用GetX框架来实现
CoinRankPage 为具体的页面实现
点击查看代码
| abstract class Routes { |
| Routes._(); |
| static const main = "/main"; |
| |
| static final routePage = [ |
| GetPage( |
| name: coinRink, |
| page: () => const CoinRankPage(), |
| binding: CoinRankBinding(), |
| ), |
| ] |
| } |
刷新和加载更多的实现
依赖框架
头部刷新和底部加载更多widget封装
点击查看代码
| import 'package:flutter/cupertino.dart'; |
| |
| import 'package:pull_to_refresh/pull_to_refresh.dart'; |
| |
| |
| class RefreshHeader extends StatelessWidget { |
| const RefreshHeader({Key? key}) : super(key: key); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const WaterDropHeader( |
| complete: Center( |
| child: Text("下拉刷新完成"), |
| ), |
| ); |
| } |
| } |
| |
| |
| class RefreshFooter extends StatelessWidget { |
| const RefreshFooter({Key? key}) : super(key: key); |
| |
| @override |
| Widget build(BuildContext context) { |
| return CustomFooter( |
| builder: (context, mode) { |
| Widget body; |
| if (mode == LoadStatus.idle) { |
| body = const Text("上拉加载"); |
| } else if (mode == LoadStatus.loading) { |
| body = const CupertinoActivityIndicator(); |
| } else if (mode == LoadStatus.failed) { |
| body = const Text("加载失败!点击重试!"); |
| } else if (mode == LoadStatus.canLoading) { |
| body = const Text("松手,加载更多!"); |
| } else { |
| body = const Text("没有更多数据了!"); |
| } |
| return Center(child: body); |
| }, |
| ); |
| } |
| } |
| |
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