React Native Styling

Priority: P1 (OPERATIONAL)

Implementation Guidelines

• StyleSheet.create: Always use over inline objects (optimized, validated).
• Flexbox: Default layout. No CSS Grid.
• Responsive: Use Dimensions, useWindowDimensions, or percentage widths.
• Theming: Centralize colors, fonts in theme/ folder.
• Platform Styles: Use Platform.select for conditional styles.
• Dark Mode: Use React Context + useColorScheme().

Code

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    paddingHorizontal: 16, // Use consistent spacing (8, 12, 16, 24)
  },
  title: {
    fontSize: 20,
    fontWeight: '600',
    ...Platform.select({
      ios: { fontFamily: 'SF Pro' },
      android: { fontFamily: 'Roboto' },
    }),
  },
});

Responsive Design

const { width } = useWindowDimensions();
const isSmall = width < 375;

Anti-Patterns

• No Inline Styles: Use StyleSheet.create.
• No Magic Numbers: Use theme constants.
• No Absolute Positioning: Avoid unless necessary.
• No Fixed Widths: Use flex or percentages.

Reference & Examples

See references/theming.md for Design Tokens, Theme Systems, Responsive Scaling, and Shadow Helpers.

Related Topics

common/best-practices | components