flutter flutter_screenutil Looking up a deactivated widget's ancestor is unsafe.

先强调一下，很多问题可以使用reStart更新试一下下!!!!!

使用flutter_screenutil 报错 Looking up a deactivated widget's ancestor is unsafe.

The following assertion was thrown while dispatching notifications for SwiperController:

Looking up a deactivated widget's ancestor is unsafe.

At this point the state of the widget's element tree is no longer stable.

To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor

by

calling dependOnInheritedWidgetOfExactType() in the widget's didChangeDependencies() method.

为SwipController发送通知时引发了以下断言：

查找停用小部件的祖先是不安全的。

此时，小部件元素树的状态不再稳定。

要在dispose（）方法中安全地引用小部件的祖先，请保存对祖先的引用

通过

在小部件的didChangeDependencies（）方法中调用dependOnInheritedWidgetOfExactType（）。

初始代码，这个组件引用到了ListView里，开始报错

经过仔细阅读使用文档，核对版本号

新版本代码如下

首先要在lib/main.dart注册一下

import 'package:flutter/material.dart';

import 'pages/tabs/Tabs.dart';

// import 'routers/router.dart';

import 'pages/tabs/Tabs.dart';

import 'pages/test/Search.dart';

import 'package:flutter_screenutil/flutter_screenutil.dart';

void main() {

  runApp(MyApp());

}

// 输入stf  有状态组件

// stss 无状态组件

class MyApp extends StatefulWidget {

  const MyApp({Key? key}) : super(key: key);

  @override

  _MyAppState createState() => _MyAppState();

}

class _MyAppState extends State<MyApp> {

  final Map<String, WidgetBuilder> routes = {

    '/': (context) => Tabs(),

    '/search': (context) => SearchPage(),

  };

  Route<dynamic> _onGenerateRoute(RouteSettings settings) {

    //   return MaterialPageRoute(builder: (context) {

    // 如果访问的路由页需要登录，但当前未登录，则直接返回登录页路由，

    // 引导用户登录；其它情况则正常打开路由。

    // 统一处理

    // })

    final String? name = settings.name;

    final Function pageContentBuilder = routes[name] as Function;

    print('到1');

    if (settings.arguments != null) {

      print('到2');

      final Route route = MaterialPageRoute(

          builder: (context) =>

              pageContentBuilder(context, arguments: settings.arguments));

      return route;

    } else {

      print('到3');

      final Route route =

          MaterialPageRoute(builder: (context) => pageContentBuilder(context));

      return route;

    }

  }

  @override

  Widget build(BuildContext context) {

    // return MaterialApp(

    //   // home: Tabs()

    //   initialRoute: '/',

    //   onGenerateRoute: _onGenerateRoute,

    // );

    return ScreenUtilInit(

      designSize: Size(360, 690),

      builder: () => MaterialApp(

        // home: Tabs()

        initialRoute: '/',

        onGenerateRoute: _onGenerateRoute,

      ),

    );

  }

}

使用案例

Widget _titleWidget(value) {

    return Container(

      height: 32.h,

      margin: EdgeInsets.only(left: 20.w),

      padding: EdgeInsets.only(left: 20.w),

      decoration: BoxDecoration(

          border: Border(left: BorderSide(color: Colors.red, width: 10.w))),

      child: Text(value, style: TextStyle(color: Colors.pink)),

    );

  }

巴特西

flutter flutter_screenutil Looking up a deactivated widget's ancestor is unsafe.

先强调一下，很多问题可以使用reStart更新试一下下!!!!!

使用flutter_screenutil 报错 Looking up a deactivated widget's ancestor is unsafe.

初始代码，这个组件引用到了ListView里，开始报错

经过仔细阅读使用文档，核对版本号

新版本代码如下

首先要在lib/main.dart注册一下

使用案例

最需要注意的一点点！！！！使用reStart更新试一下下!!!!!

大功告成

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