AppDelegate.swift

Purpose

The AppDelegate.swift file acts as the main entry point for the HealthyWear iOS app, responsible for initializing Bluetooth services, connecting native iOS functionality with Flutter using MethodChannel and EventChannel, and handling system-level behaviors like notifications and background execution.

Key Frameworks Used

import UIKit
import Flutter
import CoreBluetooth
import MetaWear
import UserNotifications
import workmanager

  • UIKit & Flutter: UI & app lifecycle integration.

  • CoreBluetooth: Handles BLE device discovery and communication.

  • MetaWear: Used for wearable sensor API.

  • UserNotifications: For local push notifications.

  • WorkManager: Background tasks.

Main Responsibilities

  • Sets up Flutter and plugin registration.

  • Initializes CoreBluetooth manager.

  • Registers MethodChannels and EventChannels.

  • Delegates BLE handling to custom classes.

  • Handles background restoration of Bluetooth state.

  • Requests notification permissions.

BLE Integration

var centralManager: CBCentralManager?

Initializes a central Bluetooth manager and sets the class as its delegate:

centralManager = CBCentralManager(delegate: self, queue: nil)

Flutter Channels

var sensoriaMethodChannel: FlutterMethodChannel?
var metaWearMethodChannel: FlutterMethodChannel?
var serviceMethodChannel: FlutterMethodChannel?

var metaWearEventChannel: FlutterEventChannel?
var sensoriaEventChannel: FlutterEventChannel?

These channels are used for:

  • Exchanging BLE sensor data.

  • Broadcasting status updates.

  • Sending command invocations from Dart.

Sensor Handlers

var metaWearHandler: MetaWearHandler?
var sensoriaHandler: SensoriaHandler?
var sensoriaHandlerRight: SensoriaHandlerRight?
var sensoriaHandlerLeft: SensoriaHandlerLeft?

Handlers for managing individual sensors and communication streams.

Notification Setup

private func createNotificationChannel()

  • Requests user permission for notifications.

  • Prepares alert and sound-based alerts.

  • Handles the result via a closure.

Background BLE Support

func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any])

Ensures restoration of BLE state and reinitializes any pending connections or tasks if needed.

Secondary BluetoothManager Class

class BluetoothManager: NSObject, CBCentralManagerDelegate

Encapsulates background BLE scanning and restoration logic. It provides modular recovery from BLE interruptions and lifecycle resets.

Integration Notes

  • GeneratedPluginRegistrant.register() integrates all Dart plugins into native runtime.

  • BLE and notification functions are cleanly separated from UI logic.

  • Sensor handlers like MetaWearHandler and SensoriaHandler are modular and extensible.