Meet Nearby Interaction

6:01 - Basic session setup

// A session instance. Store in whichever data structure makes the most sense for your app.
var niSession: NISession?

// Instantiate a new session object and set the session's delegate.
func prepareMySession() {
  // Verify hardware support.
  guard NISession.isSupported else {
    print("Nearby Interaction is not available on this device.")
    return
  }
  
  // Create a new session for each peer.
  niSession = NISession()

  // Set the session’s delegate.
  niSession?.delegate = self // This class of 'self' needs to conform to NISessionDelegate.
}

// Share the encoded discovery token to the peer you intend to interact with.
func sendDiscoveryTokenToMyPeer(myPeer: Any /* change to whichever type represents peers in your app */) {                                
	guard let myToken = niSession?.discoveryToken else {
		// The session object is not initialized or has been invalidated.
		return
	}

	if let encodedToken = try? NSKeyedArchiver.archivedData(withRootObject: myToken, requiringSecureCoding: true) {
		<# share token using your app's networking layer #>
	}
}

// Once you receive a token from the peer, create a configuration and run the session.
// This functions shows how to decode token data that was previously encoded using NSKeyedArchiver.
func runMySession(peerTokenData: Data) {
  guard let peerDiscoveryToken = try? NSKeyedUnarchiver.unarchivedObject(ofClass: NIDiscoveryToken.self, from: peerTokenData) else {
    print("Unexpectedly failed to decode discovery token.")
    return
  }

  // Create a session configuration using the discovery token received from the peer.
  let config = NINearbyPeerConfiguration(peerToken: peerDiscoveryToken)

  // Run the session with the configuration.
  niSession?.run(config)
}

12:40 - Verify hardware support

// Always verify hardware support.
guard NISession.isSupported else {
  print("Nearby Interaction is not available on this device.")
  return
}