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Point your Firebase Apple SDK at Lark by passing your Lark URL to Database.database(url:). Everything else — observers, writes, queries — works without changes.

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Setup

Add Firebase Realtime Database via Swift Package Manager or CocoaPods: 
// In Xcode: File > Add Package Dependencies
// Enter: https://github.com/firebase/firebase-ios-sdk
// Select "FirebaseDatabase"

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Connect to Lark

Pass your Lark URL when getting the database instance: 
import FirebaseDatabase

// Change this from https://PROJECT_ID.firebaseio.com
let database = Database.database(url: "https://your-lark-project-id.larkdb.net")
let ref = database.reference()
If your GoogleService-Info.plist already has the DATABASE_URL field, you can update it there instead and use Database.database() without arguments.

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Project settings

Before connecting, make sure your Lark project is configured correctly:
  1. Allow Legacy Firebase must be enabled in your Lark project settings. This turns on the Firebase wire protocol.
  2. If your Firebase app stores many independent data silos under path prefixes (game rooms, workspaces, etc.), see Database routing for options on splitting them into separate Lark databases.