React Native UI Animate

React Native library for gestures and animation

Installation

npm install react-native-ui-animate

or Install with yarn:

yarn add react-native-ui-animate

Getting Started

react-native-ui-animate provides lots of easy to use APIs to create smooth animations and gestures for React Native.

import { AnimatedBlock, useAnimatedValue } from "react-native-ui-animate";

export default function () {
  const opacity = useAnimatedValue(0); // It initializes opacity object with value 0.

  return (
    <View>
      {/* AnimatedBlock component should be used with useAnimatedValue() */}
      <AnimatedBlock
        style={{
          opacity: opacity.value, // value property should be passed
          width: 100,
          padding: 20,
          background: "#39F",
        }}
      >
        ANIMATED
      </AnimatedBlock>

      {/* Animating from 0 to 1 is very simple just assign opacity.value = 1 */}
      <TouchableOpacity onPress={() => (opacity.value = 1)}>
        <Text>Animate Me</Text>
      </TouchableOpacity>
    </View>
  );
}

Animates opacity from 0 to 1.

useAnimatedValue()

useAnimatedValue() is very flexible and powerful hook that lets you define animated values. It accepts a number and returns a node with same value on value property. Whenever value property is assigned to another value, it auto animates from one value to another.

const opacity = useAnimatedValue(0); // initialize with 0 opacity

...
style={{
    opacity: opacity.value // access with `.value`
}}
...

...
onPress={() => opacity.value = 1} // Assignment
...

AnimatedBlock

AnimatedBlock is a View component which can accept the animation node from useAnimatedValue() hook.

const width = useAnimatedValue(100);

<AnimatedBlock
  style={{
    width: width.value,
    height: 100,
    backgroundColor: "#39f",
  }}
/>;

interpolate

The interpolate() function allows animated node value to map from input ranges to different output ranges. By default, it will extrapolate the curve beyond the ranges given, but you can also have it clamp the output value.

import {
  useAnimatedValue,
  AnimatedBlock,
  interpolate,
} from "react-native-ui-animate";

const width = useAnimatedValue(100);

<AnimatedBlock
  style={{
    width: width.value,
    height: 100,
    backgroundColor: interpolate(width.value, [100, 200], ["red", "blue"]),
  }}
/>;

backgroundColor is interpolated from input range [100, 200] to output range ["red", "blue"]. So, when the width changes from 100 to 200, backgroundColor will change from red to blue.

License

MIT