Xamarin iOS-如何获取当前的蓝牙状态？

Question

我在Xamarin iOS应用程序（带有Xamarin Forms）中使用经典蓝牙。 我需要获取当前的蓝牙状态。 仅获得-“开”或“关”，未设置。 我使用以下代码：

public class CbCentralDelegate : CBCentralManagerDelegate
{
    public override void UpdatedState(CBCentralManager central)
    {
        if (central.State == CBCentralManagerState.PoweredOn)
        {
            System.Console.WriteLine("Powered On");
        }
    }
}

public class BlManager: IBluetoothHelper
{
    private readonly CBCentralManager _bluetoothManager;
    public BlManager()
    {
        try
        {
             //this i get exception
            _bluetoothManager = new CBCentralManager(new CbCentralDelegate(), DispatchQueue.DefaultGlobalQueue,
                new CBCentralInitOptions { ShowPowerAlert = true });
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

    }
    public bool IsConnect()
    {
        return _bluetoothManager.State == CBCentralManagerState.PoweredOn;
    }
} 

但是在我的BlManager构造函数中，出现异常：

Exception Type:  EXC_BAD_ACCESS (SIGABRT)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Region Info: 0 is not in any region.  Bytes before following region: 4364402688
  REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
  UNUSED SPACE AT START
--->  
  __TEXT                 0000000104238000-0000000105db8000 [ 27.5M] r-x/r-x SM=COW  ....app/My.iOS

Triggered by Thread:  0
Application Specific Information:
abort() called

也许我需要我的应用程序的特殊权限？ 有什么建议吗？