Building a Persistent Settings Screen
Create a settings screen with toggles for notifications and dark mode, persist each setting to AsyncStorage, and restore preferences on app startup.
What a Persistent Settings Screen Does
A persistent settings screen lets users configure app preferences — such as dark mode, notification preferences, or language — and have those preferences survive app restarts. The settings are saved to AsyncStorage when changed and loaded back on startup. This is one of the most common patterns in any production React Native app.
Defining the Settings State
Start by defining a TypeScript interface for your settings object and a DEFAULT_SETTINGS constant used when no saved settings exist (first launch). Keeping defaults in a constant makes it easy to fall back safely and to reference the initial shape in type guards and migration logic.
interface Settings {
darkMode: boolean;
notificationsEnabled: boolean;
fontSize: 'small' | 'medium' | 'large';
}
const DEFAULT_SETTINGS: Settings = {
darkMode: false,
notificationsEnabled: true,
fontSize: 'medium',
};
const SETTINGS_KEY = 'app_settings';All lessons in this course
- Reading and Writing with AsyncStorage
- Storing and Parsing JSON Objects
- Building a Persistent Settings Screen
- Clearing Storage and Migration Strategies