Can't Change Font Family (React-Native)

Question

I'm pretty new to react-native and don't have much experience with CSS. I'm simply trying to change the font family to helvetica. I've tried multiple times and nothing changes

This is my css code:

import {StyleSheet} from "react-native";

export default StyleSheet.create({

  header: {
    backgroundColor:'#004D4D',
    height: 35,
  },

  headerT: {
    color: '#FFFFFF',
    fontSize: 20,
    fontFamily: 'Helvetica',
    textAlign: 'center',
    justifyContent: 'center',
  },

  body: {
    backgroundColor:'#E6FFFF',
    flex:1,
  },

})

This is the page I'm trying to amend

import React, { Component } from 'react';
import { Text, View, Button } from 'react-native';
import styles from "../style/css";

class HomeScreen extends Component{
  render(){
    return(
      <View style={styles.body}>


        <View style={styles.header}>
          <Text style={styles.headerT}>Home Screen</Text>
        </View>


      </View>

    );
  }
}

export default HomeScreen;

This is my directory

Answer 1

A list for avaliable react-native fonts: https://github.com/react-native-training/react-native-fonts

If you are using Android, Helvetica won't work directly, you need to use custom font.

Here is an article for Custom Fonts in React Native for iOS & Android Builds