Reactnative-iOS回调Javascript的方法

Reactnative可以调用原生模块，原生模块也可以给JavaScript发送事件通知.最好的方法是继承RCTEventEmitter.自定义继承自PushEventEmitter的子类RCTEventEmitter.

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

@interface PushEventEmitter : RCTEventEmitter <RCTBridgeModule>

- (void)addEventReminderReceived:(NSNotification *)notification;

@end

实现supportedEvents方法

#import "PushEventEmitter.h"

@implementation PushEventEmitter

+ (id)allocWithZone:(NSZone *)zone {
  static PushEventEmitter *sharedInstance = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    sharedInstance = [super allocWithZone:zone];
  });
  return sharedInstance;
}

RCT_EXPORT_MODULE();

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

- (void)addEventReminderReceived:(NSNotification *)notification {
  [self sendEventWithName:@"EventReminder" body:@{@"name": @"FlyElephant"}];
}

@end

React native 设置:

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

const PushEventEmitter = NativeModules.PushEventEmitter;

const emitterManager = new NativeEventEmitter(PushEventEmitter);

订阅通知和移除通知:

  componentDidMount() {
    subscription = emitterManager.addListener(
      'EventReminder',
      (reminder) => console.log('JavaScript接收到通知:'+reminder.name)
    );

  }
  componentWillUnmount(){
    subscription.remove();// 移除通知
  }

调用测试:

PushEventEmitter *eventEmitter = [PushEventEmitter allocWithZone:nil];

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