How to return a string in function in native module in react-native

Question

I am working on a function related to the native part of ios written in Object-C,

I want to write a method that returns a string in Object-C,

but I am facing a problem when I write this method: Expected selector for Objective-C method,

My code is as follows:

RCT_EXPORT_METHOD((NSString *)getName)
{
  return "Sammeme";
}
@end

Anyone doing ios development can help me to solve this problem,

Thank you

when I write the above method it throws an exception as: Expected selector for Objective-C method , so I want to solve it. Do you know what I mean? — Thang
– Thang, Commented Dec 22, 2021 at 8:29
Is this the complete code? Is there also an @start somewhere? Is this in a class? Could you show the rest of the class? — dasdom
– dasdom, Commented Dec 22, 2021 at 8:34

Sil Cia · Accepted Answer · 2022-09-23 00:49:19Z

1

In your Implementation file, inside of your RCT_EXPORT_METHOD, in order to return a value you can either use a promise or a callback. I like to use a promise:

RCT_EXPORT_METHOD(returnStringFromNativeModule:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject) {
    resolve(@"This is a value returned from a Native Module");
}

and in your React Native code, this is how you would call your method:

import { NativeModules } from 'react-native';


const { myNativeModule } = NativeModules;
const myString = await myNativeModule.returnStringFromNativeModule();

answered Sep 23, 2022 at 0:49

Sil Cia

1068 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to return a string in function in native module in react-native

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related