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react-native-reanimated
provides an API that greatly simplifies the process of creating smooth, powerful, and maintainable animations.
Reanimated uses React Native APIs that are incompatible with "Remote JS Debugging" for JavaScriptCore. In order to use a debugger with your app with
react-native-reanimated
, you'll need to use the Hermes JavaScript engine and the JavaScript Inspector for Hermes.
Android Device | Android Emulator | iOS Device | iOS Simulator | Web |
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npx expo install react-native-reanimated
If you're installing this in a bare React Native app, you should also follow these additional installation instructions.
After the installation completes, you must also add the Babel plugin to babel.config.js:
module.exports = function (api) {
api.cache(true);
return {
presets: ['babel-preset-expo'],
plugins: ['react-native-reanimated/plugin'],
};
};
After you add the Babel plugin, restart your development server and clear the bundler cache: npx expo start --clear
.
If you load other Babel plugins, the Reanimated plugin has to be the last item in the plugins array.
For web, you'll have to install the @babel/plugin-proposal-export-namespace-from
Babel plugin and update the babel.config.js:
plugins: [
'@babel/plugin-proposal-export-namespace-from',
'react-native-reanimated/plugin',
],
After you add the Babel plugin, restart your development server and clear the bundler cache: npx expo start --clear
.
You should refer to the react-native-reanimated docs for more information on the API and its usage. But the following example (courtesy of that repo) is a quick way to get started.
import Animated, {
useSharedValue,
withTiming,
useAnimatedStyle,
Easing,
} from 'react-native-reanimated';
import { View, Button } from 'react-native';
import React from 'react';
export default function AnimatedStyleUpdateExample(props) {
const randomWidth = useSharedValue(10);
const config = {
duration: 500,
easing: Easing.bezier(0.5, 0.01, 0, 1),
};
const style = useAnimatedStyle(() => {
return {
width: withTiming(randomWidth.value, config),
};
});
return (
<View
style={{
flex: 1,
alignItems: 'center',
justifyContent: 'center',
flexDirection: 'column',
}}>
<Animated.View
style={[{ width: 100, height: 80, backgroundColor: 'black', margin: 30 }, style]}
/>
<Button
title="toggle"
onPress={() => {
randomWidth.value = Math.random() * 350;
}}
/>
</View>
);
}