CoreBluetooth XPC connection invalid

Question

public class BLE: NSObject, CBCentralManagerDelegate {      var centralManager:CBCentralManager!      public override init() {         super.init()         self.centralManager = CBCentralManager.init(delegate: self, queue: nil)     }      public func centralManagerDidUpdateState(_ central: CBCentralManager) {          switch central.state {         case .unknown:             print("unknown")         case .resetting:             print("resetting")         case .unsupported:             print("unsupported")         case .unauthorized:             print("unauthorized")         case .poweredOff:             print("powered off")         case .poweredOn:             print("powered on")             self.centralManager.scanForPeripherals(withServices: nil, options: nil)         }     } } 

This is my code, whenever I run it, it gives me the message

“[CoreBlueooth] XPC Connection Invalid”

I did try adding NSBluetoothPeripheralUsageDescription into my info.plist file but that didn’t work.

The weird part though is that, if I initialize CBCentralManager directly instead of using a class then everything works fine.

This problem only arises when I try to initialize CBCentralManager by creating on object of the class BLE or any other class for that matter.

Answer 1

CBCentralManager reference should be a strong reference to the class as a member variable. It cannot work as a local reference.

Try next:

class ViewController: UIViewController {    var ble: BLE!    override func viewDidLoad() {       super.viewDidLoad()        ble = BLE()   } }  class BLE: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {    private var manager: CBCentralManager!     required override init() {       super.init()       manager = CBCentralManager.init(delegate: self, queue: nil)    }     func centralManagerDidUpdateState(_ central: CBCentralManager) {       var consoleLog = ""        switch central.state {       case .poweredOff:           consoleLog = "BLE is powered off"       case .poweredOn:           consoleLog = "BLE is poweredOn"       case .resetting:           consoleLog = "BLE is resetting"       case .unauthorized:           consoleLog = "BLE is unauthorized"       case .unknown:           consoleLog = "BLE is unknown"       case .unsupported:           consoleLog = "BLE is unsupported"       default:           consoleLog = "default"       }       print(consoleLog)    } } 

Answer 2

I ran into the same issue: sandboxing is "On" by default and disables access to Bluetooth.

Make sure your target capabilities allow Bluetooth HW access (see attached screenshot).