When do you choose ValueNotifier and when ChangeNotifier?

Question

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Answer 1

Short answer

ValueNotifier suits a single value with a setter and notification, while ChangeNotifier is more suitable when you have a model or more than one field and related operations.

Explanation

Start with the simplest: ValueNotifier<T> for small state, and ChangeNotifier when you need methods and reading more than one value. Both need a clear owner and dispose, and neither alone solves async or persistence.

Code example

final selectedTab = ValueNotifier<int>(0);
selectedTab.value = 1;

Common mistakes

Changing the contents of a mutable value inside a ValueNotifier without replacing the value.
Using one huge ChangeNotifier for every feature in the app.

Follow-up questions

When do you use InheritedWidget and didChangeDependencies?

Short answer

Explanation

Code example

Common mistakes

Follow-up questions

Sources