React Native event emitter with callback on both Android & iOS.

Sometimes we send event to javascript and want to execute some native codes with javascript result, we have to write lots of template codes, so this library provide the ability to send event with callback.

$ cd RNEventDemo/
$ yarn install
$ react-native run-ios # or react-native run-android

$ yarn add rn-event-emitter-callback

• You must be consuming React itself via CocoaPods for this to work, see React Native documentation on how to set that up.

• Add the following to your Podfile and run pod update

  pod 'ReactEventEmitter', :path => '../node_modules/rn-event-emitter-callback/Source/ios/'
  

• Edit android/settings.gradle to look like this (without the +):

  rootProject.name = 'MyApp'
  
  include ':app'
  
  + include ':ReactEventEmitter'
  + project(':ReactEventEmitter').projectDir = new File(rootProject.projectDir, '../node_modules/rn-event-emitter-callback/Source/android')

• Edit android/app/build.gradle to look like this:

  apply plugin: 'com.android.application'
  
  android {
    ...
  }
  
  dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.facebook.react:react-native:+"  // From node_modules
    implementation 'org.greenrobot:eventbus:3.1.1'
  + implementation project(':ReactEventEmitter')
  }

• Edit MainApplication.java to look like this:

  package com.myapp;
  
  + import me.tom.react.event.ReactEventEmitterPackage;
  
  ....
  
    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
        new MainReactPackage()
  +   , new ReactEventEmitterPackage()
      );
    }
  
  }

• JavaScript
• iOS
• Android

ReactEventEmitter.addListener(name, (params, callback) => {});
ReactEventEmitter.removeListener(name);

- (void)sendEvent:(RCTBridge *)bridge name:(NSString *)name;
- (void)sendEvent:(RCTBridge *)bridge name:(NSString *)name
           params:(id)params;
- (void)sendEvent:(RCTBridge *)bridge name:(NSString *)name
         callback:(ReactEventEmitterCallbackHandler)callback;
- (void)sendEvent:(RCTBridge *)bridge name:(NSString *)name
           params:(id)params
         callback:(ReactEventEmitterCallbackHandler)callback;

public void sendEvent(ReactContext context, String name);
public void sendEvent(ReactContext context, String name, @Nullable Object params);
public void sendEvent(ReactContext context,
                      String name,
                      @Nullable ReactEventEmitterCallbackHandler callbackHandler);
public void sendEvent(ReactContext context,
                      String name,
                      @Nullable Object params,
                      @Nullable ReactEventEmitterCallbackHandler callbackHandler);

The callback is run in main thread.

MIT