We are on Build a screen

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2024-10-08 16:58:50 -05:00
parent 37745648ad
commit 3d79e24ffb
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import { Tabs } from 'expo-router';
import React from 'react';
import { TabBarIcon } from '@/components/navigation/TabBarIcon';
import { Colors } from '@/constants/Colors';
import { useColorScheme } from '@/hooks/useColorScheme';
export default function TabLayout() {
const colorScheme = useColorScheme();
return (
<Tabs
screenOptions={{
tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
headerShown: false,
}}>
<Tabs.Screen
name="index"
options={{
title: 'Home',
tabBarIcon: ({ color, focused }) => (
<TabBarIcon name={focused ? 'home' : 'home-outline'} color={color} />
),
}}
/>
<Tabs.Screen
name="explore"
options={{
title: 'Explore',
tabBarIcon: ({ color, focused }) => (
<TabBarIcon name={focused ? 'code-slash' : 'code-slash-outline'} color={color} />
),
}}
/>
</Tabs>
);
}

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import Ionicons from '@expo/vector-icons/Ionicons';
import { StyleSheet, Image, Platform } from 'react-native';
import { Collapsible } from '@/components/Collapsible';
import { ExternalLink } from '@/components/ExternalLink';
import ParallaxScrollView from '@/components/ParallaxScrollView';
import { ThemedText } from '@/components/ThemedText';
import { ThemedView } from '@/components/ThemedView';
export default function TabTwoScreen() {
return (
<ParallaxScrollView
headerBackgroundColor={{ light: '#D0D0D0', dark: '#353636' }}
headerImage={<Ionicons size={310} name="code-slash" style={styles.headerImage} />}>
<ThemedView style={styles.titleContainer}>
<ThemedText type="title">Explore</ThemedText>
</ThemedView>
<ThemedText>This app includes example code to help you get started.</ThemedText>
<Collapsible title="File-based routing">
<ThemedText>
This app has two screens:{' '}
<ThemedText type="defaultSemiBold">app/(tabs)/index.tsx</ThemedText> and{' '}
<ThemedText type="defaultSemiBold">app/(tabs)/explore.tsx</ThemedText>
</ThemedText>
<ThemedText>
The layout file in <ThemedText type="defaultSemiBold">app/(tabs)/_layout.tsx</ThemedText>{' '}
sets up the tab navigator.
</ThemedText>
<ExternalLink href="https://docs.expo.dev/router/introduction">
<ThemedText type="link">Learn more</ThemedText>
</ExternalLink>
</Collapsible>
<Collapsible title="Android, iOS, and web support">
<ThemedText>
You can open this project on Android, iOS, and the web. To open the web version, press{' '}
<ThemedText type="defaultSemiBold">w</ThemedText> in the terminal running this project.
</ThemedText>
</Collapsible>
<Collapsible title="Images">
<ThemedText>
For static images, you can use the <ThemedText type="defaultSemiBold">@2x</ThemedText> and{' '}
<ThemedText type="defaultSemiBold">@3x</ThemedText> suffixes to provide files for
different screen densities
</ThemedText>
<Image source={require('@/assets/images/react-logo.png')} style={{ alignSelf: 'center' }} />
<ExternalLink href="https://reactnative.dev/docs/images">
<ThemedText type="link">Learn more</ThemedText>
</ExternalLink>
</Collapsible>
<Collapsible title="Custom fonts">
<ThemedText>
Open <ThemedText type="defaultSemiBold">app/_layout.tsx</ThemedText> to see how to load{' '}
<ThemedText style={{ fontFamily: 'SpaceMono' }}>
custom fonts such as this one.
</ThemedText>
</ThemedText>
<ExternalLink href="https://docs.expo.dev/versions/latest/sdk/font">
<ThemedText type="link">Learn more</ThemedText>
</ExternalLink>
</Collapsible>
<Collapsible title="Light and dark mode components">
<ThemedText>
This template has light and dark mode support. The{' '}
<ThemedText type="defaultSemiBold">useColorScheme()</ThemedText> hook lets you inspect
what the user's current color scheme is, and so you can adjust UI colors accordingly.
</ThemedText>
<ExternalLink href="https://docs.expo.dev/develop/user-interface/color-themes/">
<ThemedText type="link">Learn more</ThemedText>
</ExternalLink>
</Collapsible>
<Collapsible title="Animations">
<ThemedText>
This template includes an example of an animated component. The{' '}
<ThemedText type="defaultSemiBold">components/HelloWave.tsx</ThemedText> component uses
the powerful <ThemedText type="defaultSemiBold">react-native-reanimated</ThemedText> library
to create a waving hand animation.
</ThemedText>
{Platform.select({
ios: (
<ThemedText>
The <ThemedText type="defaultSemiBold">components/ParallaxScrollView.tsx</ThemedText>{' '}
component provides a parallax effect for the header image.
</ThemedText>
),
})}
</Collapsible>
</ParallaxScrollView>
);
}
const styles = StyleSheet.create({
headerImage: {
color: '#808080',
bottom: -90,
left: -35,
position: 'absolute',
},
titleContainer: {
flexDirection: 'row',
gap: 8,
},
});

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import { Image, StyleSheet, Platform } from 'react-native';
import { HelloWave } from '@/components/HelloWave';
import ParallaxScrollView from '@/components/ParallaxScrollView';
import { ThemedText } from '@/components/ThemedText';
import { ThemedView } from '@/components/ThemedView';
export default function HomeScreen() {
return (
<ParallaxScrollView
headerBackgroundColor={{ light: '#A1CEDC', dark: '#1D3D47' }}
headerImage={
<Image
source={require('@/assets/images/partial-react-logo.png')}
style={styles.reactLogo}
/>
}>
<ThemedView style={styles.titleContainer}>
<ThemedText type="title">Welcome!</ThemedText>
<HelloWave />
</ThemedView>
<ThemedView style={styles.stepContainer}>
<ThemedText type="subtitle">Step 1: Try it</ThemedText>
<ThemedText>
Edit <ThemedText type="defaultSemiBold">app/(tabs)/index.tsx</ThemedText> to see changes.
Press{' '}
<ThemedText type="defaultSemiBold">
{Platform.select({ ios: 'cmd + d', android: 'cmd + m' })}
</ThemedText>{' '}
to open developer tools.
</ThemedText>
</ThemedView>
<ThemedView style={styles.stepContainer}>
<ThemedText type="subtitle">Step 2: Explore</ThemedText>
<ThemedText>
Tap the Explore tab to learn more about what's included in this starter app.
</ThemedText>
</ThemedView>
<ThemedView style={styles.stepContainer}>
<ThemedText type="subtitle">Step 3: Get a fresh start</ThemedText>
<ThemedText>
When you're ready, run{' '}
<ThemedText type="defaultSemiBold">npm run reset-project</ThemedText> to get a fresh{' '}
<ThemedText type="defaultSemiBold">app</ThemedText> directory. This will move the current{' '}
<ThemedText type="defaultSemiBold">app</ThemedText> to{' '}
<ThemedText type="defaultSemiBold">app-example</ThemedText>.
</ThemedText>
</ThemedView>
</ParallaxScrollView>
);
}
const styles = StyleSheet.create({
titleContainer: {
flexDirection: 'row',
alignItems: 'center',
gap: 8,
},
stepContainer: {
gap: 8,
marginBottom: 8,
},
reactLogo: {
height: 178,
width: 290,
bottom: 0,
left: 0,
position: 'absolute',
},
});

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example/app/+html.tsx Normal file
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import { ScrollViewStyleReset } from 'expo-router/html';
import { type PropsWithChildren } from 'react';
/**
* This file is web-only and used to configure the root HTML for every web page during static rendering.
* The contents of this function only run in Node.js environments and do not have access to the DOM or browser APIs.
*/
export default function Root({ children }: PropsWithChildren) {
return (
<html lang="en">
<head>
<meta charSet="utf-8" />
<meta httpEquiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
{/*
Disable body scrolling on web. This makes ScrollView components work closer to how they do on native.
However, body scrolling is often nice to have for mobile web. If you want to enable it, remove this line.
*/}
<ScrollViewStyleReset />
{/* Using raw CSS styles as an escape-hatch to ensure the background color never flickers in dark-mode. */}
<style dangerouslySetInnerHTML={{ __html: responsiveBackground }} />
{/* Add any additional <head> elements that you want globally available on web... */}
</head>
<body>{children}</body>
</html>
);
}
const responsiveBackground = `
body {
background-color: #fff;
}
@media (prefers-color-scheme: dark) {
body {
background-color: #000;
}
}`;

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import { Link, Stack } from 'expo-router';
import { StyleSheet } from 'react-native';
import { ThemedText } from '@/components/ThemedText';
import { ThemedView } from '@/components/ThemedView';
export default function NotFoundScreen() {
return (
<>
<Stack.Screen options={{ title: 'Oops!' }} />
<ThemedView style={styles.container}>
<ThemedText type="title">This screen doesn't exist.</ThemedText>
<Link href="/" style={styles.link}>
<ThemedText type="link">Go to home screen!</ThemedText>
</Link>
</ThemedView>
</>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
padding: 20,
},
link: {
marginTop: 15,
paddingVertical: 15,
},
});

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example/app/_layout.tsx Normal file
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import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { Stack } from 'expo-router';
import * as SplashScreen from 'expo-splash-screen';
import { useEffect } from 'react';
import 'react-native-reanimated';
import { useColorScheme } from '@/hooks/useColorScheme';
// Prevent the splash screen from auto-hiding before asset loading is complete.
SplashScreen.preventAutoHideAsync();
export default function RootLayout() {
const colorScheme = useColorScheme();
const [loaded] = useFonts({
SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
});
useEffect(() => {
if (loaded) {
SplashScreen.hideAsync();
}
}, [loaded]);
if (!loaded) {
return null;
}
return (
<ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
<Stack>
<Stack.Screen name="(tabs)" options={{ headerShown: false }} />
<Stack.Screen name="+not-found" />
</Stack>
</ThemeProvider>
);
}

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import Ionicons from '@expo/vector-icons/Ionicons';
import { PropsWithChildren, useState } from 'react';
import { StyleSheet, TouchableOpacity, useColorScheme } from 'react-native';
import { ThemedText } from '@/components/ThemedText';
import { ThemedView } from '@/components/ThemedView';
import { Colors } from '@/constants/Colors';
export function Collapsible({ children, title }: PropsWithChildren & { title: string }) {
const [isOpen, setIsOpen] = useState(false);
const theme = useColorScheme() ?? 'light';
return (
<ThemedView>
<TouchableOpacity
style={styles.heading}
onPress={() => setIsOpen((value) => !value)}
activeOpacity={0.8}>
<Ionicons
name={isOpen ? 'chevron-down' : 'chevron-forward-outline'}
size={18}
color={theme === 'light' ? Colors.light.icon : Colors.dark.icon}
/>
<ThemedText type="defaultSemiBold">{title}</ThemedText>
</TouchableOpacity>
{isOpen && <ThemedView style={styles.content}>{children}</ThemedView>}
</ThemedView>
);
}
const styles = StyleSheet.create({
heading: {
flexDirection: 'row',
alignItems: 'center',
gap: 6,
},
content: {
marginTop: 6,
marginLeft: 24,
},
});

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import { Link } from 'expo-router';
import { openBrowserAsync } from 'expo-web-browser';
import { type ComponentProps } from 'react';
import { Platform } from 'react-native';
type Props = Omit<ComponentProps<typeof Link>, 'href'> & { href: string };
export function ExternalLink({ href, ...rest }: Props) {
return (
<Link
target="_blank"
{...rest}
href={href}
onPress={async (event) => {
if (Platform.OS !== 'web') {
// Prevent the default behavior of linking to the default browser on native.
event.preventDefault();
// Open the link in an in-app browser.
await openBrowserAsync(href);
}
}}
/>
);
}

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import type { PropsWithChildren, ReactElement } from 'react';
import { StyleSheet, useColorScheme } from 'react-native';
import Animated, {
interpolate,
useAnimatedRef,
useAnimatedStyle,
useScrollViewOffset,
} from 'react-native-reanimated';
import { ThemedView } from '@/components/ThemedView';
const HEADER_HEIGHT = 250;
type Props = PropsWithChildren<{
headerImage: ReactElement;
headerBackgroundColor: { dark: string; light: string };
}>;
export default function ParallaxScrollView({
children,
headerImage,
headerBackgroundColor,
}: Props) {
const colorScheme = useColorScheme() ?? 'light';
const scrollRef = useAnimatedRef<Animated.ScrollView>();
const scrollOffset = useScrollViewOffset(scrollRef);
const headerAnimatedStyle = useAnimatedStyle(() => {
return {
transform: [
{
translateY: interpolate(
scrollOffset.value,
[-HEADER_HEIGHT, 0, HEADER_HEIGHT],
[-HEADER_HEIGHT / 2, 0, HEADER_HEIGHT * 0.75]
),
},
{
scale: interpolate(scrollOffset.value, [-HEADER_HEIGHT, 0, HEADER_HEIGHT], [2, 1, 1]),
},
],
};
});
return (
<ThemedView style={styles.container}>
<Animated.ScrollView ref={scrollRef} scrollEventThrottle={16}>
<Animated.View
style={[
styles.header,
{ backgroundColor: headerBackgroundColor[colorScheme] },
headerAnimatedStyle,
]}>
{headerImage}
</Animated.View>
<ThemedView style={styles.content}>{children}</ThemedView>
</Animated.ScrollView>
</ThemedView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
header: {
height: 250,
overflow: 'hidden',
},
content: {
flex: 1,
padding: 32,
gap: 16,
overflow: 'hidden',
},
});

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import { Text, type TextProps, StyleSheet } from 'react-native';
import { useThemeColor } from '@/hooks/useThemeColor';
export type ThemedTextProps = TextProps & {
lightColor?: string;
darkColor?: string;
type?: 'default' | 'title' | 'defaultSemiBold' | 'subtitle' | 'link';
};
export function ThemedText({
style,
lightColor,
darkColor,
type = 'default',
...rest
}: ThemedTextProps) {
const color = useThemeColor({ light: lightColor, dark: darkColor }, 'text');
return (
<Text
style={[
{ color },
type === 'default' ? styles.default : undefined,
type === 'title' ? styles.title : undefined,
type === 'defaultSemiBold' ? styles.defaultSemiBold : undefined,
type === 'subtitle' ? styles.subtitle : undefined,
type === 'link' ? styles.link : undefined,
style,
]}
{...rest}
/>
);
}
const styles = StyleSheet.create({
default: {
fontSize: 16,
lineHeight: 24,
},
defaultSemiBold: {
fontSize: 16,
lineHeight: 24,
fontWeight: '600',
},
title: {
fontSize: 32,
fontWeight: 'bold',
lineHeight: 32,
},
subtitle: {
fontSize: 20,
fontWeight: 'bold',
},
link: {
lineHeight: 30,
fontSize: 16,
color: '#0a7ea4',
},
});

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import { View, type ViewProps } from 'react-native';
import { useThemeColor } from '@/hooks/useThemeColor';
export type ThemedViewProps = ViewProps & {
lightColor?: string;
darkColor?: string;
};
export function ThemedView({ style, lightColor, darkColor, ...otherProps }: ThemedViewProps) {
const backgroundColor = useThemeColor({ light: lightColor, dark: darkColor }, 'background');
return <View style={[{ backgroundColor }, style]} {...otherProps} />;
}

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import * as React from 'react';
import renderer from 'react-test-renderer';
import { ThemedText } from '../ThemedText';
it(`renders correctly`, () => {
const tree = renderer.create(<ThemedText>Snapshot test!</ThemedText>).toJSON();
expect(tree).toMatchSnapshot();
});

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// Jest Snapshot v1, https://goo.gl/fbAQLP
exports[`renders correctly 1`] = `
<Text
style={
[
{
"color": "#11181C",
},
{
"fontSize": 16,
"lineHeight": 24,
},
undefined,
undefined,
undefined,
undefined,
undefined,
]
}
>
Snapshot test!
</Text>
`;

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// You can explore the built-in icon families and icons on the web at https://icons.expo.fyi/
import Ionicons from '@expo/vector-icons/Ionicons';
import { type IconProps } from '@expo/vector-icons/build/createIconSet';
import { type ComponentProps } from 'react';
export function TabBarIcon({ style, ...rest }: IconProps<ComponentProps<typeof Ionicons>['name']>) {
return <Ionicons size={28} style={[{ marginBottom: -3 }, style]} {...rest} />;
}

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/**
* Below are the colors that are used in the app. The colors are defined in the light and dark mode.
* There are many other ways to style your app. For example, [Nativewind](https://www.nativewind.dev/), [Tamagui](https://tamagui.dev/), [unistyles](https://reactnativeunistyles.vercel.app), etc.
*/
const tintColorLight = '#0a7ea4';
const tintColorDark = '#fff';
export const Colors = {
light: {
text: '#11181C',
background: '#fff',
tint: tintColorLight,
icon: '#687076',
tabIconDefault: '#687076',
tabIconSelected: tintColorLight,
},
dark: {
text: '#ECEDEE',
background: '#151718',
tint: tintColorDark,
icon: '#9BA1A6',
tabIconDefault: '#9BA1A6',
tabIconSelected: tintColorDark,
},
};

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export { useColorScheme } from 'react-native';

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// NOTE: The default React Native styling doesn't support server rendering.
// Server rendered styles should not change between the first render of the HTML
// and the first render on the client. Typically, web developers will use CSS media queries
// to render different styles on the client and server, these aren't directly supported in React Native
// but can be achieved using a styling library like Nativewind.
export function useColorScheme() {
return 'light';
}

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/**
* Learn more about light and dark modes:
* https://docs.expo.dev/guides/color-schemes/
*/
import { useColorScheme } from 'react-native';
import { Colors } from '@/constants/Colors';
export function useThemeColor(
props: { light?: string; dark?: string },
colorName: keyof typeof Colors.light & keyof typeof Colors.dark
) {
const theme = useColorScheme() ?? 'light';
const colorFromProps = props[theme];
if (colorFromProps) {
return colorFromProps;
} else {
return Colors[theme][colorName];
}
}

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#!/usr/bin/env node
/**
* This script is used to reset the project to a blank state.
* It moves the /app directory to /app-example and creates a new /app directory with an index.tsx and _layout.tsx file.
* You can remove the `reset-project` script from package.json and safely delete this file after running it.
*/
const fs = require('fs');
const path = require('path');
const root = process.cwd();
const oldDirPath = path.join(root, 'app');
const newDirPath = path.join(root, 'app-example');
const newAppDirPath = path.join(root, 'app');
const indexContent = `import { Text, View } from "react-native";
export default function Index() {
return (
<View
style={{
flex: 1,
justifyContent: "center",
alignItems: "center",
}}
>
<Text>Edit app/index.tsx to edit this screen.</Text>
</View>
);
}
`;
const layoutContent = `import { Stack } from "expo-router";
export default function RootLayout() {
return (
<Stack>
<Stack.Screen name="index" />
</Stack>
);
}
`;
fs.rename(oldDirPath, newDirPath, (error) => {
if (error) {
return console.error(`Error renaming directory: ${error}`);
}
console.log('/app moved to /app-example.');
fs.mkdir(newAppDirPath, { recursive: true }, (error) => {
if (error) {
return console.error(`Error creating new app directory: ${error}`);
}
console.log('New /app directory created.');
const indexPath = path.join(newAppDirPath, 'index.tsx');
fs.writeFile(indexPath, indexContent, (error) => {
if (error) {
return console.error(`Error creating index.tsx: ${error}`);
}
console.log('app/index.tsx created.');
const layoutPath = path.join(newAppDirPath, '_layout.tsx');
fs.writeFile(layoutPath, layoutContent, (error) => {
if (error) {
return console.error(`Error creating _layout.tsx: ${error}`);
}
console.log('app/_layout.tsx created.');
});
});
});
});