Basically the title says all - Can native react app code convert/rollback to native mobile code(ios and android)?
Background - there is a react native app and there are some bugs and I would like to export the react native code to their native app code (ios and android) which I can fix them in native apps.
No. The React Native JavaScript is never translated into Swift or Java code and then compiled - it runs within the Safari or Chrome JavaScript engines. See here for more details.
However, as its name implies, React Native does rely on native code for more complex operations. If the bugs are in those npm modules you might be able to fix them there.
Related
As I understand, React Three Fiber(R3F) supports React Native, but not sure if it works in the React Native for Desktop App. (R3F).
They uses expo-gl library, and the offical document of expo says that it supports android, ios, and web.
Does this mean that I cannot use R3F in React Native for Desktop (Windows, macOS)?
I've tried to initiate the React Native for Desktop app and tried to install three, R3F, and, expo-gl and run, but it didn't work.
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.
I have a native library that can be used by react native app or traditional native app. Inside of my library, I want to check if this native library is running in react native environment or not.
Any one has suggestion?
I am new to React Native and I know that there are two ways to develop native applications using react native
1- react native init --> need to compile the native cod
==> Result is Native Application for Android "Android SDK required" and Native Application for IOS "Xcode required"
2- create react native app --> no need to compile the native code !!
as CRNA uses Expo_SDK to access native API, but :
Is the result app is really native! or Expo Sdk is like Cordova but used by React and if result native, Expo claims that the result is native!, have they cloned both Android Sdk and Xcode for IOS or how does it work ?!
Expo apps are React Native apps which contain the Expo SDK. The SDK is a native-and-JS library which provides access to the device’s system functionality (things like the camera, contacts, local storage, and other hardware). That means you don’t need to use Xcode or Android Studio, or write any native code, and it also makes your pure-JS project very portable because it can run in any native environment containing the Expo SDK.
Expo also provides UI components to handle a variety of use-cases that almost all apps will cover but are not baked into React Native core, e.g. icons, blur views, and more.
Finally, the Expo SDK provides access to services which typically are a pain to manage but are required by almost every app. Most popular among these: Expo can manage your Assets for you, it can take care of Push Notifications for you, and it can build native binaries which are ready to deploy to the app store.
You should take a look at the Expo doc
Expo app is as native as React native. They do the following things so you don't need to setup Android / iOS SDK locally.
provide Expo App on Android/iOS
so you can build the js code and use Expo App to debug during the development.
provide build server
once you run expo build command, expo will upload the compiled js code and build Android/iOS file on their server. You can download the built file from their server.
You can eject from the Expo, setup Android / iOS SDK locally, and build the app as normal React Native app
Expo (and react-native) apps use native (android and ios) ui components to render the apps ui, like any native android or ios app would. Therefore they can be considered as native apps.
However your app logic is executed within a javascript thread an will communicate with the native threads (through the react-native bridge) to modify the native ui components. Since the bridge is completely asynchronous this should not affect the native ui performance of your application. If you want to understand the communication between js and native code it may be a good start to read this guide.
2- create react native app --> no need to compile the native code !!
With expo there is no need to compile native code, as expo already includes a "ready to use build" of react-native along with several other common react-native libraries. In an expo app this will be used together with your javascript bundle which than communicates through the react-native bridge with the already present native part.
They are basically just abusing the fact that you can inject different javascript bundles into a prebuilt react-native app. (as long as you are using only accessing a subset of the native functionality of that prebuilt app)
Note that Appcenters codepush uses the same functionality and their setup integration actually delivers a nice example how different javascript bundles can be loaded without touching the native part:
in ios AppDelegate.m this line is changed:
original react-native js-bundle loading which always resolves a static bundle
return [[NSBundle mainBundle] URLForResource:#"main" withExtension:#"jsbundle"];
js-bundle loading with codepush which can resolve to different js-bunldes
return [CodePush bundleURL];
Link to full codepush ios integration guide
I have had a play with react native creating ios apps but have not tried android yet. With android you also get 'android wear' for watches etc, will react native work creating apps for those devices?
React Native does not run on Android Wear at the current time, so you would have to do that code native.
Actually, you can try React native vanilla