A simple, native, and efficient geofencing/region monitoring react native library for both iOS and android.

import Boundary, {Events} from 'react-native-boundary';

class MyComponent extends Class {
  componentWillMount() {
    Boundary.add({
      lat: 34.017714,
      lng: -118.499033,
      radius: 50, // in meters
      id: "Chipotle",
    })
      .then(() => console.log("success!"))
      .catch(e => console.error("error :(", e));
   
    Boundary.on(Events.ENTER, id => {
      // Prints 'Get out of my Chipotle!!'
      console.log(`Get out of my ${id}!!`);
    });
    
    Boundary.on(Events.EXIT, id => {
      // Prints 'Ya! You better get out of my Chipotle!!'
      console.log(`Ya! You better get out of my ${id}!!`)
    })
  }
  
  componentWillUnmount() {
    // Remove the events
    Boundary.off(Events.ENTER)
    Boundary.off(Events.EXIT)

    // Remove the boundary from native API´s
    Boundary.remove('Chipotle')
      .then(() => console.log('Goodbye Chipotle :('))
      .catch(e => console.log('Failed to delete Chipotle :)', e))
  }
}

$ npm install react-native-boundary --save

$ react-native link react-native-boundary

1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
2. Go to node_modules ➜ react-native-boundary and add RNBoundary.xcodeproj
3. In XCode, in the project navigator, select your project. Add libRNBoundary.a to your project's Build Phases ➜ Link Binary With Libraries
4. Run your project (Cmd+R)<

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.eddieowens.RNBoundaryPackage; to the imports at the top of the file
• Add new RNBoundaryPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-boundary'
   project(':react-native-boundary').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-boundary/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-boundary')
   

Add the ACCESS_FINE_LOCATION permission to your AndroidManifest.xml like so,

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.mypackage">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    ...
</manifest>

Before iOS 11: Add the following to your Info.plist:

• NSLocationAlwaysUsageDescription

For iOS 11: Add the following to your Info.plist:

• NSLocationWhenInUseUsageDescription
• NSLocationAlwaysAndWhenInUseUsageDescription