In React Native, what is the method for utilizing index.js rather than separate index.ios.js and index.android.js files to create a cross-platform app?

Thank you for the help so far,

I am new to React Native, and I'm trying to develop a cross-platform app. Here is my index.js file:

import React from 'react';
    {
        Component,
        View,
        Text,
    } from 'react-native';

class MyReactApp extends Component {

    render() {
        return (
            <View><Text>Hello world</Text></View>
        );
    }
}

module.exports = MyReactApp;

Next, I imported the index.js into both index.ios.js and index.android.js like this:

import { AppRegistry } from 'react-native';
    MyReactApp from './index';

AppRegistry.registerComponent('MyReactApp', () => MyReactApp);

Everything seemed correct, but I encountered this error:

https://i.sstatic.net/LoZZR.png

javascriptandroidiosreact-nativecross-platform

Answer №1

Starting with React version 0.49, there is no longer a need for separate index.ios.js and index.android.js files. You can now simply use the index.js file:

import {AppRegistry} from 'react-native';
import App from './app/App';

AppRegistry.registerComponent('myApp', () => App);

(make sure to change `myApp` to the actual name of your app)

More information can be found at: (https://github.com/facebook/react-native/releases/tag/v0.49.0)

Going forward, all new projects will have a single entry-point (index.js)

Answer №2

If you want index.ios.js and index.android.js to share the same codebase in a default react-native init project, you need to set them up so they import and register the same base component as defined in index.js.

Check out how it's implemented in this sample ToDo app (Github repo available).

To avoid conflicts between index.js, index.android.js, and index.ios.js, make sure to specify the exact path when importing. See the example code snippet below.

index.ios.js and index.android.js (both with the same content)

import React from 'react';
import { AppRegistry } from 'react-native'
import ReactApp from './index.js'

AppRegistry.registerComponent('ReactApp', () => ReactApp)

index.js

// Corrected Component import location for better functionality
import React, { Component } from 'react';
import {
    View,
    Text,
} from 'react-native';

export default class ReactApp extends Component {
    render() {
        return (
            <View><Text>Hello world</Text></View>
        );
    }
}

Answer №3

To make a modification in iOS AppDelegate.m, update the following:

jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];

to

jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];

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