macOS CBCentralManager状态不受支持

Question

我试图在macOS（2017 iMac）上访问蓝牙外设，但CBCentralManager似乎永远不会进入.poweredOn状态。

import Cocoa
import CoreBluetooth

class BluetoothManager: NSObject {
  var centralManager: CBCentralManager!
  override init() {
    super.init()
    self.centralManager = CBCentralManager(delegate: self, queue:nil)
    self.checkState()
  }

  func checkState() {
    print("central state: (self.centralManager?.state.rawValue ?? -1)")
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + .seconds(2), execute: {
      self.checkState()
    })
  }
}


extension BluetoothManager: CBCentralManagerDelegate {
  func centralManagerDidUpdateState(_ central: CBCentralManager) {
    switch central.state {
    case .poweredOn:
      print("Power on")
    case .unsupported:
      print("Unsupported")
    default:break
    }
  }
}


@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

  var bluetoothManager: BluetoothManager?

  func applicationDidFinishLaunching(_ aNotification: Notification) {
    self.bluetoothManager = BluetoothManager()

  }

  ...

}

这将持续输出Unsupported，并带有控制台警告

[CoreBluetooth] XPC connection invalid

我知道Info.plist密钥NSBluetoothPeripheralUsageDescription，我尝试过，但我相信这只适用于ios设备。

我是否在寻找在iMac上管理蓝牙的错误方向？或者我的实现缺少什么？我觉得我已经涵盖了Core Bluetooth documentation所需的一切。