Does React Native support barometer on IOS - react-native

Can you access the barometer information from React Native? I see there is a polyfill for geolocation, but I'm thinking that is not the same as accessing barometer data.

The barometer in iOS is part of the CoreMotion framework, accessible within the CMAltimeter and CMAltitudeData classes.
You can import iOS native modules, and the React Native documentation has a guide for doing so.

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Can anyone embed Unity app in React Native project?

I have an augmented reality project. It will be a mobile app and I need to access the Unity app from within the app. Are there any react native libraries that you know are up-to-date?
There is webgl library for reactjs. But this library is not applicable for React Native.

how can i share mobile screen using agora video call in React-Native

how to implement screen share in agora video call in react native?
in agora documentation provide code but that not an react code example link. so how inegrated in react native.
please provide example
The React Native SDK now supports screen-sharing. You can use the startScreenCapture method to share you screen.
Old Answer:
Agora React Native SDK does not support screen sharing out of the box, however you can setup screen sharing by using the underlying Android and iOS SDKs. You can use the Android example that you referenced in your example link and write a bridge to invoke the java method from React-Native.

Offline services in mapbox react native

Is mapbox library in react native can do some offline services for routing or navigation in react native or not?
Please Help me, Thanks
I am having a similar issue at the moment too. So far I have learned that, yes React Native supports Mapbox (although tricky to set up)
I am unsure about Navigation but it does offline manager for static maps and mapbox studio projects.
https://github.com/nitaliano/react-native-mapbox-gl/blob/master/docs/OfflineManager.md

Can I use components of a web app with a React Native app

I am trying to build an app in react native. The app was originally built in unity, but due to performance reasons. It was decided the app should be rebuilt in react native. The app currently has a web app also and I am wondering if there is a way when that the react native app can use some components from the web app.
I tried to google this problem, but I only find articles about using components between react native and react native web. I do not know what the web app was built with, but I am almost certain that it was not react native web.
What component are you trying to use?
Because if it's a pure unity I think there are some libraries who are not available on a mobile device, so you can't use it.
I have in mid some C++ libraries or third part one to use the sound.

How to use JavaScriptCore in React Native android apps

We are building a React Native application on Android. We have a requirement of creating a separate JSC virtual machine instance in a thread. We do not want to use same JSC context which is used by React Native.
We have searched a lot on web and also tried to figure out how React Native is using JSC, but we are not able to find the same.
It will be very helpful if anyone can suggest us directions for the same.
Perhaps you should take a look at this:
ericwlange/AndroidJSCore
or dive deep into React Native's Android source code.
https://github.com/facebook/react-native/blob/master/ReactAndroid/src/main/jni/react/JSCExecutor.cpp