The document explains the creation of a React Native bridge for both iOS and Android, detailing the integration of native modules with the native languages Java, Kotlin, Objective-C, and Swift. It provides examples on how to implement native modules and components in both platforms, including specific code snippets and methods for communication between React Native and native code. The article concludes by offering services for hiring React Native developers to build custom cross-platform mobile applications.

1. REACT
NATIVE
BRIDGE
FOR IOS
AND
ANDROID
www.bacancytechnology.com

2. React Native is combined with iOS and
Android. We can create a React Native
bridge between the Native languages like
Java, Kotlin, Objective-c, Swift, and
JavaScript code. Here bridge means the
communication between the native
platform and React Native.

3. Native Bridge Android
Native Bridge iOS
Table of Contents
1. Native Modules
2. Native Bridge component

4. In this blog post, I will get you through both
Android as well as iOS.
Define Native Modules
Native modules are distributed as npm
packages, except that on top of the usual
Javascript, they will include some native
code per platform. To understand more
about npm packages, please go through this
useful Guide.
Native Module Steps:
Let’s understand the native modules with
examples.
Create the Exit App
We will create an ExitApp demo using react-
native CLI. In this example, button press to
exit the app using the native language.

5. Hopefully, your project runs successfully.
Native Bridge component
This tool comes handy for React Native
Developer to bridge the native component
1. Native Bridge Android
Create a new java class, ExitModule, and
ExitModulePackage.
ExitModule.java
⦿android/app/src/main/java/com/exitapp/
ExitModule.java
So it is a class that extends
ReactContextBaseJavaModule.

6. ReactContextBaseJavaModule implements a
method getName that returns a string.
getName() in string name, which we will
refer to the native module in our Javascript
code.
@ReactMethod java method should be
annotated to expose a method to JavaScript.
Multiple @ReactMethod methods can be
created in this class.

8. ExitPackage.java
⦿android/app/src/main/java/com/exitapp/
ExitPackage.java
So it is a class that extends ReactPackage.
Registering new JS modules that can be
accessed from native modules or from other
parts.
The native code requires JS modules from
the package that doesn’t automatically be
included as a part of the JS bundle, so there
should be a corresponding piece of code on
the JS side that will require the
implementation of that JS module so that it
gets bundled.

10. MainApplication.java
⦿android/app/src/main/java/com/exitapp/
MainApplication.java
ExitPackage add in MainApplication.java

11. Create new file ExitModule in Xcode
File/New/File/Cocoa Touch Class
2. Native Bridge iOS

12. ExitModule.h
⦿ios/ExitApp/ExitModule.h
RCTBridgeModule use in native land to talk
with React Native
ExitModule.m
⦿ios/ExitApp/ExitModule.m
React Native will not expose any methods
of ExitApp to JavaScript unless explicitly
told to. This is done using the
RCT_EXPORT_METHOD() macro:

13. Your class must also include the
RCT_EXPORT_MODULE() macro. RCT is
the short name for React and includes it in
your Objective-C code.
RCT_EXPORT_METHOD supports this
standard JSON object types:

14. NSString (string)
NSInteger, float, double, CGFloat,
NSNumber(number)
BOOL, NSNumber(boolean)
NSArray (array)
NSDictionary (object)
RCTResponseSenderBlock (function)
Finally, Android and iOS side native code
are completed. So ExitApp calls in react-
native in a javascript file.
NativeModule.js

15. App.js

16. OutPut:
Now run the app
To access the code of this blog post can be
accessed here .

17. In this blog, we have created UI
components using React Native JavaScript
code. If you are looking for the React Native
experts to create a bridge between
JavaScript code and native languages to
create native modules, then get in touch
with us today. Our React Native developers
are well-versed with building intuitive,
visually stunning, robust, scalable,
engaging, and user-friendly cross-platform
mobile applications.
We are a globally renowned React Native
Development company; we let you
outsource React Native developers from us
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Conclusion

18. Thank You