Provider 与 ValueNotifier 颤振

Question

谁能解释一下使用 Provider package and using ValueNofifier 的区别？

现在我正在我的应用程序中使用 ValueNotifier and ValueListenableBuilder，我发现这与使用 Providers 和 Consumers 之间有很多相似之处。两者都有使用提供的最新数据重建小部件的侦听器，并且都使用 ChangeNotifier 和 notifyListeners。

那么有什么区别，什么时候我们应该选择其中一个而不是另一个？

谢谢

Answer 1

就我在应用程序中使用这两种东西的经验而言，主要区别在于

Provider can provide changes in any part of the app, like any where with the use of notifyListener(), and can be accessed using anywhere in the app. However, there is a possibility of bug in using a global ValueNotifier, which is not recommended. Technically, doesn't gives you much control on bug tracking when the code becomes big.

Provider(
  create: (_) => MyModel(),
  child: ...
)

其他主要区别：

Provider gives you the power to make use of Multiple Providers and can be stored in a single Provider array only, however, in ValueNotifier, you are ver much restricted to use one value at a time. For using multiple ValueNotifiers, you have to create multiple ValueNotifiers, and then dispose it all every time.

MultiProvider(
  providers: [
    Provider<Something>(create: (_) => Something()),
    Provider<SomethingElse>(create: (_) => SomethingElse()),
    Provider<AnotherThing>(create: (_) => AnotherThing()),
  ],
  child: someWidget,
)

这基本上是一种将业务逻辑与普通应用程序逻辑分开的巧妙方法。

Provider 与 ValueNotifier 颤振

Provider vs ValueNotifier Flutter

provider

flutter