dratwas

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

const {
  NMWithEmitterOne,
  NMWithEmitterTwo,
  NMWithEmitterN,
} = NativeModules;

dratwas

@implementation CalendarManager
{
  bool hasListeners;
}

// Will be called when this module's first listener is added.
-(void)startObserving {
    hasListeners = YES;
}

dratwas

- (void)sessionDidConnect:(Session*)session {
    [[NSNotificationCenter defaultCenter]
     postNotificationName:@"onSessionConnect"
     object:nil
     userInfo:@{@"sessionId": session.sessionId}];
}

dratwas

#import "EventEmitterModule.h"

@implementation EventEmitterModule
{
  bool hasListeners;
}

RCT_EXPORT_MODULE();
- (NSArray<NSString *> *)supportedEvents {
    return @[@"onSessionDidConnect"];

dratwas

#import <React/RCTBridgeModule.h>
#import <React/RCTEventEmitter.h>

@interface EventEmitterModule : RCTEventEmitter <RCTBridgeModule>

@end

dratwas

subscription.remove();

dratwas

import {
  NativeModules,
  Platform,
  NativeEventEmitter,
  DeviceEventEmitter,
} from 'react-native';

export default Platform.select({
  ios: new NativeEventEmitter(NativeModules.ModuleWithEmitter),
  android: DeviceEventEmitter,

dratwas

import { NativeEventEmitter, NativeModules } from 'react-native';
const { ModuleWithEmitter } = NativeModules;

const eventEmitter = new NativeEventEmitter(ModuleWithEmitter);

const onSessionConnect = (event) => {
  console.log(event);
}

const subscription = eventEmitter.addListener('onSessionConnect', onSessionConnect);

dratwas

[self sendEventWithName:@"onSessionConnect" body:@{@"sessionId": session.sessionId}];

dratwas

#import "ModuleWithEmitter.h"

@implementation ModuleWithEmitter
  
- (NSArray<NSString *> *)supportedEvents {
    return @[@"onSessionConnect"];
}

@end