跨窗口小部件的多个实例的共享状态 [英] flutter share state across multiple instances of a widget

问题描述

在我的flutter应用程序中，我有一个 ConnectivityStatus 小部件，该小部件显示该应用程序与树莓派的当前连接状态.在我的小部件的 initState 中，我订阅了一个计时器，每隔5秒检查一次连接，并相应地更新状态，然后在处置后退订.

In my flutter app, I have a ConnectivityStatus widget which displays the current connection status of the app to my raspberry pi. In the initState of my widget, I subscribe to a timer to check the connection every 5 seconds and update the state accordingly, then unsubscribe upon disposal.

问题是，当多个屏幕使用 ConnectivityStatus 小部件时，例如在堆栈导航器设置中，我现在有两个并发订阅，因为没有实例被处置.这会导致发生许多多余的不必要的请求.

The issue is, when multiple screens use the ConnectivityStatus widget, such as in a stack navigator setup, I now have two concurrent subscriptions as neither instance has disposed. This causes many redundant, unneeded requests to occur.

我真正想要的是要么在多个屏幕上共享窗口小部件的单个实例，要么让多个实例可以访问一个全局状态.

What I really want is to either share a single instance of the widget across multiple screens, or have one global state multiple instances can access.

我该如何实现?或者是针对我的问题的其他推荐解决方案?

How can I achieve this or what are other recommended solutions to my problem?

推荐答案

最简单的方法是使用InheritedWidget将ConnectivityStatus传递给降序的小部件. https://api.flutter.dev/flutter/widgets/InheritedWidget-class.html

The most simple way of achieving this would be to use InheritedWidget to pass the ConnectivityStatus to the descending widgets. https://api.flutter.dev/flutter/widgets/InheritedWidget-class.html

您还可以研究其他状态管理解决方案，例如提供商 https://pub.dev/packages/provider 或集团 https://pub.dev/packages/flutter_bloc

You could also look into other state management solutions such as Provider https://pub.dev/packages/provider or Bloc https://pub.dev/packages/flutter_bloc

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