React Native Font Weight Cheatsheet iOS

FontWeight.js

const fontWeight = {
    thin:       '100',
    ultraLight: '200',
    light:      '300',
    regular:    '400',
    medium:     '500',
    semiBold:   '600',
    bold:       '700',
    heavy:      '800',
    black:      '900'
};

export default fontWeight;

Style.js

import FontWeight from 'FontWeight';

const styles = {
  tabBar: {
    fontWeight: FontWeight.heavy
  }
};

module.exports = styles;