如何使用提供程序将ChangeNotifier的作用域限定在某些路由上? [英] How to scope a ChangeNotifier to some routes using Provider?

问题描述

我有一个ChangeNotifier，我想在多条路线之间共享它，但不是所有条路线:

I have a ChangeNotifier, and I would like to share it between multiple routes but not all routes:

Page1是我的第一页.我只需要与Page2，Page3和Page共享ChangeNotifierProvider的数据，并在输入Page1调用后就将ChangeNotifierProvider丢弃.

Page1 is my first page. I need share data of ChangeNotifierProvider with Page2, Page3 and Page only and on enter Page1 call dispose of my ChangeNotifierProvider.

如何使用提供者来做到这一点?

How can I do this using provider?

推荐答案

为此，最简单的解决方案是在每个路由中使用个提供程序，而不是:

To do so, the easiest solution is to have one provider per route, such that instead of:

Provider(
  builder: (_) => SomeValue(),
  child: MaterialApp(),
)

您有:

final value = SomeValue();

MaterialApp(
  routes: {
    '/foo': (_) => Provider.value(value: value, child: Foo()),
    '/bar': (_) => Provider.value(value: value, child: Bar()),
    '/cannot-access-provider': (_) => CannotAccessProvider(),
  }
)

另一方面，无法自动处置"您的模型.

It is, on the other hand, not possible to have your model "automatically disposed".

provider在这种情况下无法知道可以安全处置该对象.

provider is not able in such a situation to know that it is safe to dispose of the object.

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