fish_redux 保存TabBarView和PageView的状态####1、自定义KeepAliveWidget`

####1、自定义KeepAliveWidget ``` class KeepAliveWidget extends StatefulWidget { final Widget child; const KeepAliveWidget(this.child); @override State<StatefulWidget> createState() => KeepAliveState(); } class KeepAliveState extends State<KeepAliveWidget> with AutomaticKeepAliveClientMixin { @override bool get wantKeepAlive => true; @override Widget build(BuildContext context) { return widget.child; } } Widget keepAliveWrapper(Widget child) { return KeepAliveWidget(child); } ```

####2、page或者component目录中新建wrapper,返回自定义的KeepAliveWidget ![Jietu20190705-175452.jpg](https://upload-images.jianshu.io/upload_images/1159344-2c33931fcfb12d15.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240) ``` import 'package:flutter/material.dart'; import 'package:lib_flutter/component/widget/keep_alive_widget.dart'; Widget xxxPageWrapper(Widget widget) { return KeepAliveWidget(widget); } ```

####3、在page中使用wrapper ``` import 'package:fish_redux/fish_redux.dart'; import 'effect.dart'; import 'reducer.dart'; import 'state.dart'; import 'view.dart'; import 'wrapper.dart'; class xxxPage extends Page<xxxState, Map<String, dynamic>> { TownLinePage() : super( wrapper: xxxxPageWrapper, initState: initState, effect: buildEffect(), reducer: buildReducer(), view: buildView, dependencies: Dependencies<xxxState>( adapter: null, slots: <String, Dependent<xxxState>>{}), middleware: <Middleware<xxxeState>>[], ); } ```

####4、没了