英文:
When using Flutter Riverpod, How do you access a provider from another provider?
问题
You can access the updateMessage() method from Provider A in Provider B by using the read method to obtain the StateNotifier instance provided by Provider A. Here's how you can do it:
// In Provider B
final providerA = appMessageStateProvider.notifier;
// Now you can call updateMessage() from Provider A
providerA.updateMessage("Your message", messageType: AppMessageType.someType);
This way, you can access the method without involving the UI.
英文:
I have defined a Riverpod State notifier provider(provider A), I have and then defined a method inside it's state notifier, and then I have defined Provider B, is there a way to access the method in Provider A, from Provider B without referencing the UI's WidgetRef?
// Provider A
final appMessageStateProvider = StateNotifierProvider.autoDispose<messageStateNotifier,
AppMessage>((ref) {
return messageStateNotifier();
});
// State notifier
class messageStateNotifier extends StateNotifier<AppMessage> {
messageStateNotifier() : super(AppMessage(message: '', messageType: AppMessageType.normal));
void updateMessage(String _message,{messageType = AppMessageType.normal}) {
state = AppMessage(messageType: messageType, message: _message);
}
}
and then I have the second provider below(Provider B)
final appSomthingStateProvider = StateNotifierProvider.autoDispose<appSomthingStateNotifier,
AppMessage>((ref) {
return appSomthingStateNotifier();// I then continued to define the state notifier
});
Now from Provider B, how do I access the method -> updateMessage() which is defined in provider A, without involving the UI
答案1
得分: 1
从任何提供者，您可以使用以下方式：
ref.read(otherProvider.notifier).notifierMethodHere(args);
来调用其他提供者的通知器的方法。这不会建立依赖关系，并且按照常见惯例，所有这类方法都返回 void，因此这也不是让另一个提供者执行需要响应的操作的方法。
英文:
From any provider, you can use
ref.read(otherProvider.notifier).notifierMethodHere(args);
to invoke methods of the other provider's notifier. This does not set up a dependency relationship, and by common convention, all such methods return void, so this is also not a way to get another provider to perform actions that need responses.
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