swift - 扫描特定 CBUUID IOS 时，核心蓝牙找不到外围设备(前台和后台)

Question

我遇到了核心蓝牙在扫描特定 CBUUID 时找不到外围设备的问题，并且我还想在前台和后台运行我的应用程序。但它是 didDiscover 所有近外围设备扫描，没有 CBUUID “manager.scanForPeripherals( withServices: nil, options: nil)".am 使用“MactsAsBeacon”进行广播信标模拟器。但是为什么它不能使用特定 CBUUID 的 scanForPeripherals 工作？以及它将如何在后台工作？ “我启用了蓝牙中心”我想在后台做任何额外的工作吗？

var manager:CBCentralManager!
var peripheralCB:CBPeripheral!
var peripherals = [CBPeripheral]()

override func viewDidLoad() {
    super.viewDidLoad()

    manager = CBCentralManager(delegate: self, queue: nil)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
    func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any]) {
            if let peripheralsObject = dict[CBCentralManagerRestoredStatePeripheralsKey] {
                // 2
                let peripherals = peripheralsObject as! Array<CBPeripheral>
                // 3
                if peripherals.count > 0 {
                    // 4
                    peripheralCB = peripherals[0]
                    // 5
                    peripheralCB?.delegate = self
                }
            }
        }

func centralManagerDidUpdateState(_ central: CBCentralManager) {
    var consolMessages = ""

    switch central.state
    {
    case .poweredOff:
        consolMessages = "BLE is powered off"

    case.poweredOn:
        consolMessages = "BLE is powered on"
        let serviceUUIDs = [CBUUID(string: "B0702880-A295-A8AB-F734-031A98A512DE") as AnyObject]
        let dictionaryOfOptions = [CBCentralManagerScanOptionAllowDuplicatesKey : false]
        manager.scanForPeripherals(withServices: serviceUUIDs as? [CBUUID], options:dictionaryOfOptions)
       // manager.scanForPeripherals(withServices: nil, options:nil)

    case.resetting:
        consolMessages = "BLE is resetting"

    case.unauthorized:
        consolMessages = "BLE is unauthorized"

    case.unknown:
        consolMessages = "BLE is unknown"

    case.unsupported:
        consolMessages = "unsupported"

    }
    print("\(consolMessages)")
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {

    print("peripheral \(peripheral)")
    print("peripheral Name \(peripheral.name)")

    if #available(iOS 9.0, *) {
          peripheral.accessibilityAssistiveTechnologyFocusedIdentifiers()
    } else {
        // Fallback on earlier versions
    }
    print("peripheral Name \(peripheral.name)")
    peripherals.append(peripheral)
    manager.connect(peripheral, options: nil)

    let AdvertsatingData = advertisementData[CBAdvertisementDataManufacturerDataKey]

    print("AdvertsatingData\(AdvertsatingData)")


}

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {

    print("peripheral Connected")
    print("peripheral didConnect \(peripheral)")
    print("Connected peripheral Name \(peripheral.name)")


}

func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {

    let alert = UIAlertController(title: "Alert", message: "didFailToConnect", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
    self.present(alert, animated: true, completion: nil)
}

func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {

    print("peripheral Disconnectd")

    print("Disconnect peripheral Name \(peripheral.name)")    
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {

    if error != nil{

    }
    else {
        print("didDiscoverCharacteristicsFor")

    }
}[![This is the Beacon Simulator /image/diyWA.png ][1]][1]

Answer 1

这不起作用的几个原因:

• MactsAsBeacon 发送 iBeacon 广告，这些广告是 BLE 制造商广告，并且没有蓝牙服务 UUID。 请勿将 iBeacon ProximityUUID 与您用于通过 CoreBluetooth 蓝牙进行扫描的服务 UUID 混淆。它们是根本不同的东西。

• 除非提供服务 UUID，否则 CoreBluetooth 将不会获得后台回调。这是苹果公司施加的限制。

• 即使在前台，CoreBluetooth 也无法从 iBeacon 数据包的数据中读取信标标识符。 Apple 会清除 iOS 上收到的 iBeacon 数据包的这些数据。

要在 iOS 上读取信标数据包，您必须使用 CoreLocation API。没有其他办法。

请小心确保您可以使用现成的 iOS 信标检测器检测来自 MactsAsBeacon 的传输。 Mac 程序无法在某些版本的 MacOS 上传输。