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simek
2b56011f9c
Summary: This PR adds support for the dark mode and dynamic theme changing to the default App template and to the related `NewAppScreen` components. Using `useColorScheme` hook forced me to refactor a bit main `App.js` file, but I think those changes are step in the right direction according to way in which React Native is used in larger apps, so new `Section` component has been extracted to reduce code redundancy/repetition inside `App`. Additional color `darker` has been added to the `Colors` statics from `NewAppScreen` because `dark` was too bright for the Dark Mode backgrounds. Also main `StoryBoard` on iOS has been updated to use theme based colors instead of static or hardcoded ones. There was also an unused, empty `Label` which I have removed. ~~I'm not so much experienced with Android. If someone could also update Android splash screen (if Android requires such change) it will be nice. I want to look at this later using simulator.~~ > I have updated the Android splash screen and tested this change on the Android emulator. If you have any comment or corrections feel free to post them out, I would like to put more work into this PR if it's needed. Dark Mode this days is a part of near every OS, so it could be considered as a standard feature. I hope those changes helps people which struggle with the basic theming implementation (+ there is now an example of hook and `children` prop usage in the template). ## Changelog [Internal] [Added] - Add dark mode support to the default app template Pull Request resolved: https://github.com/facebook/react-native/pull/28711 Test Plan: I have tested the App from the template on the iOS device and in Android emulator with RN `0.63.0-rc`. Screen recording on iOS (demonstarates both modes, both splash screens and transition):  Screenshot of iOS app in Dark Mode:  Screenshot of iOS app splash screen in Dark Mode:  Screenshot of Android app in the emulator:  Differential Revision: D21236148 Pulled By: shergin fbshipit-source-id: 0c8a9534d3a3f8f8099af939243a889ac4df6cda
70 lines
1.6 KiB
JavaScript
70 lines
1.6 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict-local
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* @format
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*/
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'use strict';
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import Colors from './Colors';
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import type {Node} from 'react';
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import {ImageBackground, StyleSheet, Text, useColorScheme} from 'react-native';
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import React from 'react';
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const Header = (): Node => {
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const isDarkMode = useColorScheme() === 'dark';
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return (
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<ImageBackground
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accessibilityRole="image"
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source={require('./logo.png')}
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style={[
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styles.background,
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{
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backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
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},
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]}
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imageStyle={styles.logo}>
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<Text
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style={[
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styles.text,
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{
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color: isDarkMode ? Colors.white : Colors.black,
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},
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]}>
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Welcome to React
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</Text>
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</ImageBackground>
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);
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};
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const styles = StyleSheet.create({
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background: {
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paddingBottom: 40,
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paddingTop: 96,
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paddingHorizontal: 32,
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},
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logo: {
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opacity: 0.2,
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overflow: 'visible',
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resizeMode: 'cover',
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/*
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* These negative margins allow the image to be offset similarly across screen sizes and component sizes.
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*
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* The source logo.png image is 512x512px, so as such, these margins attempt to be relative to the
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* source image's size.
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*/
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marginLeft: -128,
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marginBottom: -192,
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},
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text: {
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fontSize: 40,
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fontWeight: '600',
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textAlign: 'center',
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},
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});
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export default Header;
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