React Native Swift & Promises

AudioComponent.js

import {
  NativeModules,
} from 'react-native';

const { AudioManager } = NativeModules;

async function setPlaying (shouldPlay: boolean) => {
  const isPlayingNativeResult = await AudioManager.setPlaying(shouldPlay);
  // do something with the native result
}

AudioManager.m

#import "RCTBridgeModule.h"
// This registers your module with React Native, so it can be exposed to JS
@interface RCT_EXTERN_MODULE(AudioManager, NSObject)

RCT_EXTERN_METHOD(setPlaying:(BOOL) value
                  resolver:(RCTPromiseResolveBlock *)resolve
                  rejecter:(RCTPromiseRejectBlock *)reject
                  )

// ... other methods

@end

AudioManager.swift

import Foundation

@objc(AudioManager)
class AudioManager: RCTEventEmitter {
  // ...
  @objc func setPlaying(_ shouldPlay: Bool,
                      resolver resolve: RCTPromiseResolveBlock,
                      rejecter reject: RCTPromiseRejectBlock) -> Void {
    let isPlaying = setPlaying(shouldPlay)
    resolve(isPlaying)
  }
  // ...
}

ProjectName-Bridging-Header.h

#import "RCTBridgeModule.h"
#import "RCTEventDispatcher.h"
#import "RCTEventEmitter.h"