Two functions of centralManager used

Question

ByteGenius OP

Created May ’24

Replies 1

Boosts 0

Participants 2

I am trying to code out a background refresh part of my app but there are two centralManager functions in the app.

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        if peripheral.identifier.uuidString == selected {
            selectedPeripheral = peripheral
            centralManager?.stopScan()
            centralManager?.connect(selectedPeripheral!, options: nil)
        }
    }
    
    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        
        print("Connected to peripheral: \(peripheral)")
        // Subscribe to disconnection events
        peripheral
            .publisher(for: \.state)
            .sink { [weak self] state in
                if state == .connected {
                    self?.isConnected = true
                } else if state == .disconnected {
                    // Peripheral is disconnected, send notification
                    if self?.isConnected == true {
                        self?.sendNotification()
                        self?.isConnected = false
                    }
                }
            }
            .store(in: &cancellables)
    }

and this is the refresh part

private func handleBluetoothMonitoring(task: BGAppRefreshTask, bluetoothMonitor: BluetoothMonitor) {
        let queue = DispatchQueue(label: "com.yourcompany.bluetoothmonitor")
        task.expirationHandler = {
            // Handle expiration of the task if needed
        }
        
        queue.async {
            // Perform Bluetooth monitoring tasks here
            if let centralManagerInstance = bluetoothMonitor.centralManager {
                        DispatchQueue.main.async {
                            bluetoothMonitor.centralManagerDidUpdateState(centralManagerInstance)
                        }
                    } else {
                        print("Central manager is nil")
                    }


            // End the task
            task.setTaskCompleted(success: true)
        }
    }

Is there a way to solve this? Thanks!

Boost

Answer 1

Engineer OP

Apple

May ’24

What is the point of calling centralManagerDidUpdateState in the refresh part? This function is something you are expected to implement, so the system can call it when there is a state change. It is not something to call.

Whatever the purpose of it is, you will need to understand the code to see why they have done this. It might be some trick or workaround that makes the app work in a certain way. But this is not the correct way to use centralManagerDidUpdateState

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