App.js

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

export default class App extends React.Component {

  state = {
    isLoading: true
  };

  render() {
    const { isLoading } = this.state;

    return (
      <View style={styles.container}>
        {isLoading ? (
          <Text>Fetching The Weather</Text>
        ) : (
            <View>
              <Text>Minimalist Weather App</Text>
            </View>
          )}
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center'
  }
});