App.tsx

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 */

import React from 'react';
import {
  SafeAreaView,
  StatusBar,
  StyleSheet,
  useColorScheme,
  Text,
  TextInput,
  Button,
} from 'react-native';

import { Colors } from 'react-native/Libraries/NewAppScreen';

import NativeLocalStorage from './specs/NativeLocalStorage';


function App(): React.JSX.Element {
  const isDarkMode = useColorScheme() === 'dark';
  const [value, setValue] = React.useState<string | null>(null);

  const [editingValue, setEditingValue] = React.useState<string | null>(null);

  React.useEffect(() => {
    const s = NativeLocalStorage.getString('myKey');
    setValue(s);
  }, [])

  function saveValue() {
    NativeLocalStorage.setString(editingValue || "", 'myKey');
    setValue(editingValue);
  }

  const backgroundStyle = {
    backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
  };

  return (
    <SafeAreaView style={backgroundStyle, {flex: 1}}>
      <StatusBar
        barStyle={isDarkMode ? 'light-content' : 'dark-content'}
        backgroundColor={backgroundStyle.backgroundColor}
      />

      <Text style={styles.text}>Current stored value is: {value || "No Value"}</Text>

      <TextInput placeholder={"Enter the text you want to store"} style={styles.textInput} onChangeText={setEditingValue} />

      <Button title="Save" onPress={saveValue} />

    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  text: {
    margin: 10,
    fontSize: 20
  },
  textInput: {
    margin: 10,
    height: 40,
    borderColor: 'black',
    borderWidth: 1,
    paddingLeft: 5,
    paddingRight: 5,
    borderRadius: 5
  }
});

export default App;