Animated loading button in react native using reanimated

What is React Native?

React Native is a framework for building native mobile apps using JavaScript and the React library. It is possible to use animation in React Native apps by using the Animated component provided by the framework.

How the animations are handled in native code?

In React Native, animations are implemented using the native animation libraries of the platform on which the app is running. When you create an animation using the Animated component and its animation methods, React Native converts the animation into platform-specific code that can be executed natively on the device.

For example, on iOS, the Animated component uses the native Core Animation library to create and run animations. On Android, it uses the Property Animation library. This allows React Native to create smooth and performant animations that are consistent with the rest of the platform.

To use the Animated component and its animation methods, you write your animation code in JavaScript using the React Native framework. When the app is run, React Native converts this code into native code that is executed by the device's native animation libraries.

Lets start to implement loading button animation:

The Animated component in React Native provides a powerful set of tools for creating animations in your app. You can use it to animate the properties of components, such as their size, position, and opacity.

To create an animation, you can use one of the many animation methods provided by the Animated component, such as timing, spring, or decay. Each of these methods takes an animated value as an input and updates it over time according to the parameters you specify.

An animated value is a special type of value that is used to drive an animation. It can be created using the new Animated.Value(initialValue) constructor, where initialValue is the starting value for the animation. You can then use the various animation methods provided by the Animated component to update the value over time.

Here is an example of how you might use the timing method to animate the size of a component:

import React, { useState } from 'react';

import { View, Text, Button, Animated } from 'react-native';

const MyComponent = () => {

const [animatedValue] = useState(new Animated.Value(100));

const animate = () => {

Animated.timing(animatedValue, {

toValue: 200,

duration: 1000,

}).start();

};

return (

<View>

<Button title="Start animation" onPress={animate} />

<Animated.View style={{ width: animatedValue, height: animatedValue }}>

<Text>Animated component</Text>

</Animated.View>

</View>

);

};

export default MyComponent;

In this example, the timing method is used to animate the width and height style properties of an Animated.View component over a duration of 1000 milliseconds (1 second). The toValue parameter specifies the ending value for the animation, and the start method is called to start the animation.

You can use the various animation methods provided by the Animated component to create a wide range of animations in your React Native app. You can also use the interpolate method to specify custom input and output ranges for the animation, and you can combine multiple animation methods to create more complex animations.

Why do we need Animation in our application?

1. Enhanced user experience: Animation can make an app more enjoyable and engaging for users by adding visual interest and making it more interactive.
2. Improved usability: Animation can help to guide users through an app and provide visual feedback, which can make the app more intuitive and easier to use.
3. Enhanced aesthetics: Animation can help to create a more polished and professional look and feel for an app.
4. Increased engagement: Animation can help to hold users' attention and keep them engaged with the app.
5. Improved communication: Animation can help to communicate complex ideas or concepts more effectively, especially when combined with text or other visual elements.
6. Enhanced branding: Animation can be used to create a unique and memorable visual identity for an app, which can help to differentiate it from competitors and enhance its branding.

Animations can be a powerful tool for enhancing the user experience, usability, and aesthetics of a React Native app. By using the Animated component and its various animation methods, you can create a wide range of animations that can improve the look and feel of your app and make it more engaging and interactive for users. Whether you are a beginner or an experienced developer, learning how to use animation in a React Native app can be a valuable skill that can help you to create more dynamic and effective apps.