为什么CBPeripheralManagerDelegate方法没有调用？

Question

为什么没有CBPeripheralManagerDelegate方法调用，尽管我已经将类初始化为   var bluetoothManager = CBPeripheralManager（delegate：self，queue：nil，options：nil）

已经在我的Bundle中添加了BlueTooth Framework。

import UIKit
import CoreBluetooth

class AppSettingsViewController: UIViewController {



    override func viewDidLoad() {
        super.viewDidLoad()

       var bluetoothManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

extension AppSettingsViewController : CBPeripheralManagerDelegate{


    func peripheralManagerDidUpdateState(peripheral: CBPeripheralManager!) {

        if peripheral.state == CBPeripheralManagerState.PoweredOn{

            println("broadcasting")



        }else if peripheral.state == CBPeripheralManagerState.PoweredOff{

            println("no bluetooth found")

        }else if peripheral.state == CBPeripheralManagerState.Unauthorized {

            println("This option is not allowed by your application")

        }

    }


}

Answer 1

使bluetoothManager成为实例变量。目前，viewDidLoad()完成后会被取消分配。

Answer 2

您必须将bluetoothManager保存到ViewController的全局变量才能接收回叫。

class AppSettingsViewController: UIViewController, CBPeripheralManagerDelegate {

    var bluetoothManager : CBPeripheralManager?

    override func viewDidLoad() {
        super.viewDidLoad()

        self.bluetoothManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)


    }
}