Why Custom components in React Native? - Purpose & Use Cases

The Big Idea

What if you could fix a bug or change a style once and see it everywhere instantly?

The Scenario

Imagine building a mobile app where you need the same button style on many screens. You copy and paste the button code everywhere, changing colors or text each time.

The Problem

This manual way is slow and risky. If you want to change the button style later, you must find and update every copy. It's easy to miss some, causing inconsistent looks and bugs.

The Solution

Custom components let you create a reusable button once. Then you use it everywhere by just calling its name. Change the button style in one place, and all buttons update automatically.

Before vs After

✗ Before

const Screen1 = () => <Button color="blue" title="Click" />;
const Screen2 = () => <Button color="blue" title="Submit" />;

✓ After

const MyButton = ({title}) => <Button color="blue" title={title} />;
const Screen1 = () => <MyButton title="Click" />;
const Screen2 = () => <MyButton title="Submit" />;

What It Enables

Custom components make your app easier to build, update, and keep looking great everywhere.

Real Life Example

Think of a shopping app where every product card looks the same. Using a custom product card component means you design it once and reuse it for all products, saving time and keeping the app consistent.

Key Takeaways

Manual repetition causes slow updates and errors.

Custom components let you reuse UI parts easily.

One change updates all uses, saving time and effort.