如何在后台扫描 BLE 设备？

Question

我想在后台像在前台一样扫描 BLE 设备。但是我的 iOS 应用程序无法正常运行。下面是我的 AppDelegate class 代码。

private var centralManager : CBCentralManager!

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    centralManager = CBCentralManager(delegate: self, queue: nil, options: nil)return true
}

func applicationWillEnterForeground(_ application: UIApplication) {

    print("entering foreground...")
}

func applicationDidEnterBackground(_ application: UIApplication) {
    print("entered background...")

    print(centralManager.state)
    centralManager = CBCentralManager(delegate: self, queue: nil, options: nil)
}


func centralManagerDidUpdateState(_ central: CBCentralManager) {
    if central.state == .poweredOn {
        print("Bluetooth is On")
        centralManager.scanForPeripherals(withServices: nil, options: nil)
    } else {
        print(central.state)
    }
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {

    print("\nName   : \(peripheral.name ?? "(No name)")")
    print("RSSI   : \(RSSI)")

    let name = peripheral.name ?? ""
    if name.contains("ETGuardian") {

        let DetailData = advertisementData["kCBAdvDataManufacturerData"]
        let DiscoveredData = String(describing: DetailData)

        print(DiscoveredData)

        for ad in advertisementData {
            print("AD Data: \(ad)")
        }
    }

  }
}

请帮我将后台状态的应用程序像前台一样扫描。

Answer 1

来自文档：link

Apps that have specified the bluetooth-central background mode are allowed to scan while in the background. That said, they must explicitly scan for one or more services by specifying them in the serviceUUIDs parameter. The CBCentralManager scan option is ignored while scanning in the background.

要进行后台扫描，您需要指定服务 UUID。

如何在后台扫描 BLE 设备？

How to scan BLE devices in Background?

scanning

ios

bluetooth-lowenergy

swift