Prevent Rerendering Elements with setState in React Native

Описание: Learn how to prevent specific elements from rerendering in React Native when using `setState`, ensuring a smoother experience with libraries like TypeWriter.
---
This video is based on the question https://stackoverflow.com/q/62862665/ asked by the user 'JosephG' ( https://stackoverflow.com/u/1395137/ ) and on the answer https://stackoverflow.com/a/62863087/ provided by the user 'İlker' ( https://stackoverflow.com/u/12806052/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Prevent an element from rerendering on setState in React Native

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Prevent Rerendering Elements with setState in React Native

When developing applications in React Native, leveraging the dynamic nature of setState is crucial. However, a common challenge arises when we want to update only specific components while preventing others from unnecessarily rerendering. This need is especially apparent when using libraries like TypeWriter, which depend on the component's lifecycle to function correctly.

In this guide, we'll explore how to effectively handle setState calls to update an image's source without causing the TypeWriter component to rerender. Let’s dive into the problem and the solution step-by-step.

The Problem

In React Native, using setState triggers a rerender of the component and its children. In scenarios where a component relies on animations or text effects—such as with the TypeWriter library—this rerender can reset the animation sequence, which is often undesirable.

In the example provided, you have a button that, when pressed, changes the source of an image. However, the TypeWriter component with static text also rerenders, causing it to restart its animated effect.

Here’s a brief overview of the code that illustrates the issue:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To solve the challenge of rerendering unwanted components, you can create a separate component for the part that requires updating—in this case, the image. Let’s restructure the code accordingly.

Step 1: Create a New Component

Create a new component named NewComponent that will manage the image rendering. This component will contain the logic for changing the image when the button is pressed.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the Main Component

Now, integrate this new component into your AccountScreen. This allows you to have the TypeWriter text independent from the image rendering.

[[See Video to Reveal this Text or Code Snippet]]

Additional Considerations

Functional Components: Remember that when using functional components, you can't refer to this as you would with class components. Instead, use hooks and callback functions appropriately.

useCallback: If you need to call functions within functional components, consider wrapping them in useCallback to optimize performance and avoid unnecessary renders.

Conclusion

By creating a separate component for the image, we ensure the TypeWriter does not rerender when its parent state changes. This approach allows for smoother animations and a better user experience in your React Native applications. React's state management can be complex, but with the right structure, you can effectively manage render cycles for optimal performance. Happy coding!