react-native-reanimated

GitHub

npm

A library that provides an API that greatly simplifies the process of creating smooth, powerful, and maintainable animations.

Android

iOS

tvOS

Web

Bundled version:

~3.17.3

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. 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.

Installation

Terminal

- npx expo install react-native-reanimated

If you are installing this in an existing React Native app, make sure to install expo in your project. Then, follow the installation instructions provided in the library's README or documentation.

No additional configuration is required. Reanimated Babel plugin is automatically configured in babel-preset-expo when you install the library.

Usage

The following example shows how to use the react-native-reanimated library to create a simple animation.

Using react-native-reanimated

import Animated, {
  useSharedValue,
  withTiming,
  useAnimatedStyle,
  Easing,
} from 'react-native-reanimated';
import { View, Button, StyleSheet } from 'react-native';

export default function AnimatedStyleUpdateExample() {
  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={styles.container}>
      <Animated.View style={[styles.box, style]} />
      <Button
        title="toggle"
        onPress={() => {
          randomWidth.value = Math.random() * 350;
        }}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  box: {
    width: 100,
    height: 80,
    backgroundColor: 'black',
    margin: 30,
  },
});

Learn more

Visit offical documentation

Get full information on API and its usage.