footer.js

import React from 'react'
import {
  StyleSheet,
  TouchableOpacity,
  View,
  Text
} from 'react-native'

const styles = {
  button: {
    alignItems: 'center',
    justifyContent: 'center',
    borderColor: '#4FC3F7',
    backgroundColor: '#4FC3F7',
    paddingTop: 12,
    width: 230,
    paddingBottom: 12,
    marginBottom: 20,
    borderRadius: 25,
    borderWidth: 1,
  },

  container: {
    position: 'absolute',
    bottom: 0,
    left: 0,
    width: '100%',
    alignItems: 'center',
    justifyContent: 'center'
  },

  buttonText: {
    color: '#FFF',
    textAlign: 'center',
    fontWeight: 'bold',
    fontSize: 14
  }
};

const Footer = ({ onAddNewPost }) => (
  <TouchableOpacity
    style={styles.container}
    onPress={onAddNewPost}>
    <View style={styles.button}>
      <Text style={styles.buttonText}>Adicionar novo Post</Text>
    </View>
  </TouchableOpacity >
);

export default Footer