UniApp implements the extension and usage of React Native native components

UniApp is a cross-platform application development framework based on the Vue.js ecosystem. It can run code written by developers on multiple platforms, such as iOS, Android, H5, etc. React Native is a cross-platform application development technology developed by Facebook. It can use JavaScript to write code, and then convert the code into native components on each platform through the React Native framework.

In UniApp, we can achieve more functions and styles by extending React Native’s native components. This article will introduce the extension and use of React Native native components in UniApp, and provide some code examples for readers' reference.

First, we need to install the React Native plug-in in the UniApp project. Execute the following command in the root directory of the project:

npm install uni-react-native

After the installation is complete, we can start extending the native components of React Native.

Extending native components

To extend the native components of React Native, we need to create a new file in the src/native directory of the UniApp project and name it rn-extensions.js. Then write the native components we need to extend in this file.

import { View } from 'react-native';

export default {
  components: {
    RnView: {
      functional: true,
      render(h, { children, props }) {
        return h(View, props, children);
      }
    }
  }
}

In the above code, we introduced the View component in React Native through import { View } from 'react-native'. Then a new component named RnView is defined and rendered into React Native's View component in the render function. In this way, we successfully extended a React Native component named RnView.

Using native components

After we extend the native components of React Native, we can use these native components in UniApp pages.

First, introduce the React Native extension file rn-extensions.js into the UniApp page.

import rnExtensions from '@/native/rn-extensions.js';

Next, use the extended native component RnView in the uni-view component of the page.

<template>
  <view>
    <uni-view>
      <RnView style="background-color: red; width: 200px; height: 200px;"></RnView>
    </uni-view>
  </view>
</template>

In the above code, we use the extended native component RnView in the uni-view component. We use some styles to set the background color, width and height of RnView.

When we run the UniApp project in the real machine environment, we can see that a red square is displayed on the page, with a size of 200x200 pixels. This is because when we use the extended native component RnView, we set its style to a red background, a width of 200 pixels, and a height of 200 pixels.

Through the above examples, we can see that by extending the native components of React Native, we can implement more functions and styles in the UniApp project and achieve cross-platform development. This provides greater flexibility and convenience for our development work.

It should be noted that although UniApp can extend React Native’s native components, not all React Native’s native components can be used in UniApp. This depends on the adaptability of UniApp and the compatibility of the React Native plug-in.

Summary:

This article introduces the method of extending and using React Native native components in UniApp. We achieved more functions and styles by installing the React Native plug-in, extending the React Native native components, and then using these native components in the UniApp page. I hope this article will be helpful to the development of UniApp and React Native, allowing developers to better apply cross-platform development technology.

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