Reanimated or Animated: Which Animation Library Should I Use in React Native?

If you're stuck choosing between Reanimated and Animated for your React Native project, prioritize performance and your specific animation needs. Reanimated excels in complex animations that require better performance, while Animated is suitable for simpler transitions and effects.

What Are the Core Differences Between Reanimated and Animated?

Reanimated offers a more powerful API compared to Animated, allowing you to execute animations on the native thread. This results in smoother and more performant animations, especially under heavy loads or on mid-range Android devices, where Animated may struggle. On the other hand, the Animated API is sufficient for low-complexity tasks, providing easier integration for quick prototypes.

When Should I Use the Animated API?

The Animated API is a good choice when working with simpler animations like fades, translations, and scaling. For example, if you want to animate a view's opacity, the following code snippet will suffice:

import { Animated } from 'react-native';

const fadeIn = (opacity) => {
  return Animated.timing(opacity, {
    toValue: 1,
    duration: 500,
    useNativeDriver: true,
  });
};

This straightforward implementation allows you to get results quickly, making it ideal for small projects or if you are under tight deadlines.

Why Choose Reanimated Over Animated?

Reanimated is beneficial for more complex animations, especially those needing gesture interactions. If your application employs heavy animations, transitions, or requires gesture handling, Reanimated can handle these without compromising performance. Here's a basic example of how you might create an animated gesture:

import Animated, { Easing } from 'react-native-reanimated';

const translateX = new Animated.Value(0);

const moveRight = Animated.timing(translateX, {
  toValue: 100,
  duration: 300,
  easing: Easing.inOut(Easing.ease),
  useNativeDriver: true,
});

Deploying Reanimated in such scenarios yields smoother and more sophisticated interactions.

Are There Performance Issues with Animated on Mid-Range Devices?

Yes, Animated can lag on mid-range Android devices during complex animations. Rendering on the JavaScript thread can create bottlenecks, leading to dropped frames, stuttering, and a less fluid user experience. Reanimated mitigates this by utilizing the native thread, allowing for more responsive and performant animations.

How Do They Handle Gestures?

Reanimated comes with better support for gestures. Libraries like react-native-gesture-handler work seamlessly with Reanimated, making it robust for user interactions. For example, if you want to create an animated pan gesture, you can quickly achieve this:

import { PanGestureHandler } from 'react-native-gesture-handler';

<PanGestureHandler onGestureEvent={gestureHandler}>  
  <Animated.View style={{ transform: [{ translateX }] }} />
</PanGestureHandler>

With Animated, integrating gesture interactions often leads to more boilerplate code and a less elegant solution, particularly for complex gestures.

Is Reanimated Worth It for Beginners?

If you are just starting, consider your project's requirements. If simple animations suffice, Animated is indeed easier to grasp. However, if you're aiming to build applications that feature various animations and intricate user interactions, investing time in learning Reanimated will pay off significantly. The trade-off is worth it since complex animations can offer enhanced user experiences.

How Can I Mix Both Libraries in a Project?

You can combine both Animated and Reanimated in a single project, taking advantage of each library's strengths. For example, use Animated for simple animations while leveraging Reanimated for more sophisticated transitions and gestures. Here's how you might switch between them:

import Animated from 'react-native-reanimated'; // Use Reanimated features
import { Animated as AnimatedLegacy } from 'react-native'; // Use Animated features

// Example usage
const opacity = new Animated.Value(0);
const fadeIn = AnimatedLegacy.timing(opacity, { ... });

What Should I Consider When Choosing an Animation Library?

Think about these factors when making your decision:

1. Complexity of Animations: For simple animations, Animated suffices; for complex, use Reanimated.
2. Performance Needs: If you prioritize smoother performance on all devices, go with Reanimated.
3. Development Experience: Consider your team's familiarity with each library. If they are comfortable with one, that might influence your choice.
4. Future Maintenance: If you foresee the need for complex animations later, start with Reanimated to maintain consistency.

Next Steps

Evaluate your project's animation needs based on complexity and performance. Start with the library that aligns with your requirements, and consider future scalability. Both libraries can coexist, providing you with flexibility in handling animations efficiently. If you're ready to dive deeper into animation workflows or see practical implementations, check out Clevens for animated screens and boilerplates that accelerate your app development.