EventManager.swift

Purpose 

The EventManager.swift class acts as a centralized helper to send event data from native iOS code to the Flutter layer using a shared FlutterEventSink.

Singleton Pattern 

static let shared = EventManager()

Ensures that all native modules use the same EventManager instance to manage event streams.

Key Responsibilities 

Holds a reference to a FlutterEventSink.
Dispatches dictionary-based event messages to Flutter.
Ensures thread safety by using the main dispatch queue for event emission.

Properties 

private var eventSink: FlutterEventSink?

Holds the callback function provided by Flutter to receive stream data.

Methods 

Set Event Sink 

func setEventSink(sink: @escaping FlutterEventSink)

Stores the event sink function that will be used to push updates to Flutter.

Dispatch Event 

func dispatchEvent(_ event: [String: Any])

Accepts a dictionary and forwards it to Flutter using the stored eventSink.
Uses DispatchQueue.main.async to ensure the update occurs on the main UI thread.

Example usage:

EventManager.shared.dispatchEvent(["status": "connected"])

Integration 

Called by iOS BLE sensor handlers or other iOS logic that needs to report to Dart asynchronously.
Simplifies communication by abstracting Flutter stream interface away from business logic.