Question

我正在尝试编写一个简单的应用程序，即使应用程序未处于活动状态，也会不断广播“信标”。我知道使用 CoreLocation 会在应用未使用时将其关闭，因此我尝试使用 Core Bluetooth 构建解决方案。麻烦的是我无法让应用程序开始做广告。

import UIKit
import CoreBluetooth

class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralManagerDelegate {

    var centralManager:CBCentralManager = CBCentralManager()
    var peripheralManager:CBPeripheralManager = CBPeripheralManager()
    let uuid:CBUUID = CBUUID(string: "DCEF54A2-31EB-467F-AF8E-350FB641C97B")

    override func viewDidLoad() {
        super.viewDidLoad()
        self.peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
        self.centralManager.delegate = self
        let advertisingData = [CBAdvertisementDataLocalNameKey:"my-peripheral", CBAdvertisementDataServiceUUIDsKey: uuid]
        peripheralManager.startAdvertising(advertisingData)
        centralManager.scanForPeripheralsWithServices([uuid], options: nil)
    }

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

    func peripheralManagerDidStartAdvertising(peripheral: CBPeripheralManager, error: NSError?) {
        print("started advertising")
        print(peripheral)
    }

    func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
        print("peripheral discovered")
        print("peripheral: \(peripheral)")
        print("RSSI: \(RSSI)")
    }

    func centralManagerDidUpdateState(central: CBCentralManager) {
        print("central state updated")
        print(central.description)
        if central.state == .PoweredOff {
            print("bluetooth is off")
        }
        if central.state == .PoweredOn {
            print("bluetooth is on")
            let advertisingData = [CBAdvertisementDataLocalNameKey:"my-peripheral", CBAdvertisementDataServiceUUIDsKey: uuid]
            let service = CBMutableService(type: uuid, primary: true)
            self.peripheralManager.addService(service)
            peripheralManager.startAdvertising(advertisingData)
            centralManager.scanForPeripheralsWithServices(nil, options: nil)
        }
        if central.state == .Unsupported {
            print("bluetooth is unsupported on this device")
        }
    }

    func peripheralManagerDidUpdateState(peripheral: CBPeripheralManager) {
        print("peripheral state updated")
        print("\(peripheral.description)")
    }

}

我已经在两台设备上安装了这个，问题似乎在于广告的传输，因为永远不会调用onCreate()。

Answer 1

如果使用此init方法，则centralManagerDidUpdateState将起作用。如果您希望不断看到信标，可以设置CBCentralManagerScanOptionAllowDuplicatesKey选项。

getClaims()

Answer 2

传递给startAdvertising的CBAdvertisementDataServiceUUIDsKey值应该是CBUUID对象的数组，但是您要传递单个CBUUID

let advertisingData = [CBAdvertisementDataLocalNameKey:"my-peripheral", CBAdvertisementDataServiceUUIDsKey: [uuid]]

Answer 3

该问题与在.startAdvertising()通话后立即致电.addService()有关。

只有在调用.startAdvertising()委托方法之后，才能调用func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?)。

CoreBluetooth广告无法启动

3 个答案: