iOS Native Modules

CalendarManager.h

#import <React/RCTBridgeModule.h>

@interface CalendarManager : NSObject <RCTBridgeModule>
  
@end

CalendarManager.m

#import "CalendarManager.h"
#import <React/RCTLog.h>

@implementation CalendarManager

RCT_EXPORT_MODULE(EmpManCalendarManager);   // for naming the module as CalendarManager just use `RCT_EXPORT_MODULE();`

RCT_EXPORT_METHOD(addEvent:(NSString *)name location:(NSString *)location)
{
  RCTLogInfo(@"Pretending to create an event %@ at %@", name, location);
}

@end

EmpManCalendarManager.js

/**
 * This exposes the native EmpManCalendarManager module as a JS module. This has a
 * function 'addEvent' which takes the following parameters:
 *
 * 1. String name: A string for event name
 * 2. string location: A string for event location
 */

import {NativeModules} from 'react-native';

module.exports = NativeModules.EmpManCalendarManager;

login.js

import EmpManCalendarManager from './EmpManCalendarManager';

if (Platform.OS == "ios") {
  EmpManCalendarManager.addEvent('Birthday Party', '4 Privet Drive, Surrey');
}