Question

我正在尝试通过在scanForPeripheralsWithServices()中指定CBUUID来扫描我的应用中的特定BLE设备，但如果我提到它，则从不处理扫描。

这是我的CBCentralManagerDelegate代码：

func centralManagerDidUpdateState(central: CBCentralManager) {
    switch (central.state) {
    case CBCentralManagerState.PoweredOff:
        print("BLE powered off")
        self.clearDevices()

    case CBCentralManagerState.Unauthorized:
        // Indicate to user that the iOS device does not support BLE.
        print("BLE not supported")
        break

    case CBCentralManagerState.Unknown:
        // Wait for another event
        print("BLE unknown event")
        break

    case CBCentralManagerState.PoweredOn:
        print("BLE powered on")
            self.startScanning()
        break

    case CBCentralManagerState.Resetting:
        print("BLE reset")
        self.clearDevices()

    case CBCentralManagerState.Unsupported:
        print("BLE unsupported event")
        break
    }
}


    func startScanning() {
    print("\(NSDate()) Start scanning...")
       if let central = centralManager {
        let dictionaryOfOptions = [CBCentralManagerScanOptionAllowDuplicatesKey : true]
        let ble = [CBUUID(string: "B737D0FF-AF53-9B83-E5D2-922140A9FFFF")]
        central.scanForPeripheralsWithServices(ble, options: nil)
        }
}



  func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
    print("Discovered peripheral \(RSSI) dBM name: \(peripheral.name)")
    print("UUID: \(peripheral.identifier.UUIDString)")
    print("Peripheral \(peripheral.identifier)")
    .....send event to server....   
    sleep(delayPolling)
    self.startScanning()

}

如果我更改scanForPeripheralsWithServices()没有任何CBUUID字符串，它可以正常工作：

central.scanForPeripheralsWithServices(nil, options: dictionaryOfOptions)

我主要担心如果能够在后台和Apple文档中启动此线程，我们需要通过指定CBUUID来扫描特定设备以便能够运行我的任务。

你能告诉我我哪里错了吗？

通过CBUUID扫描BLE设备不起作用

0 个答案: