How do you manage the lifecycle of a controller or notifier?

Short answer

Create the controller in a clear owner, attach listeners at the right time, and clean up timers, streams, and the notifier in dispose.

Explanation

Every object that owns resources must have a known cleanup point. Do not let a provider or service live forever by default; tie its lifetime to a feature or to the app according to actual need.

Common mistakes

• Creating a controller inside build.
• Forgetting to cancel a subscription after leaving the screen.

Follow-up questions

• Explain unidirectional data flow in a Flutter app.

Sources

• Flutter API — ChangeNotifier.dispose