【发布时间】：2023-03-04 11:05:01
【问题描述】：
现在我在主线程中运行所有内容，到目前为止，我只注意到多次 UI 有点滞后。
我想知道 utilizint CoreBluetooth 库在并发方面的一般做法是什么？
您能否提供一些示例，如果有的话，应该在其他队列中运行什么？
我对蓝牙的使用：
我扫描两个外围设备，通过发送适当的值作为 CBPeripheralManager 来控制它们，以使它们开始从 IMU 发送数据（50Hz/100Hz 取决于值）。
我对来自标签的数据进行同步和规范化，并使用流媒体将它们写入文件。
传输完成后，我通过按钮触发相关动作手动发送数据文件。
我的代码
class BluetoothTagController: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate, CBPeripheralManagerDelegate{
static let sharedInstance = BluetoothTagController()
var transferCharacteristic:CBMutableCharacteristic!
var centralManager : CBCentralManager!
var sensorTagPeripheral : CBPeripheral!
var synchronizer:DataSynchronizer!
var sensorTagPeripheralArray : [CBPeripheral] = []
var peripheralManager: CBPeripheralManager!
var bluetoothIsON:Bool = false
var tag1Updating:Bool = false
var tag2Updating:Bool = false
var tag1Changed:Bool = false
var tag2Changed:Bool = false
var tagsIds:[String] = []
var peripheralCounter:Int = 0
var peripheralCounter2:Int = 0
var writeCounter:Int = 0
var timerSet:Bool = false
var haveBeenStarted:Bool = false
override init()
{
super.init()
centralManager = CBCentralManager(delegate: self, queue: nil)
peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
self.synchronizer = DataSynchronizer(frequency: 1)
}
func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?) {
print("WATCH OUT")
// print(service)
}
func setHaveBeenStarted( haveBeen: Bool) {
haveBeenStarted = haveBeen
}
func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didSubscribeTo characteristic: CBCharacteristic) {
print("subscription started")
var intVal: NSInteger = 0
if haveBeenStarted == true {
intVal = 2
}
let valueData:Data = Data(buffer: UnsafeBufferPointer(start: &intVal, count: 1))
var didSend:Bool = self.peripheralManager.updateValue(valueData, for: self.transferCharacteristic, onSubscribedCentrals: nil)
print(didSend)
}
func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
if peripheral.state != .poweredOn
{
print("no power")
self.bluetoothIsON = false
return
}
self.bluetoothIsON = true
print("powered on")
let serviceCBUUID = CBUUID(string: "5DC90000-8F79-462B-98D7-C1F8C766FA47")
let transferService:CBMutableService = CBMutableService(type: serviceCBUUID, primary: true)
let characteristicBUUID = CBUUID(string: "5DC90001-8F79-462B-98D7-C1F8C766FA47")
var intVal: NSInteger = 2
let valueData:Data = Data(buffer: UnsafeBufferPointer(start: &intVal, count: 1))
let transferCharacteristic = CBMutableCharacteristic(type: characteristicBUUID, properties: .notify, value: nil, permissions: .readable)
self.transferCharacteristic = transferCharacteristic
transferService.characteristics = [transferCharacteristic as CBCharacteristic]
self.peripheralManager.add(transferService)
self.peripheralManager.startAdvertising(nil)
}
func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?) {
}
func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveRead request: CBATTRequest) {
print("didReceiveReadRequest")
//
}
func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didUnsubscribeFrom characteristic: CBCharacteristic) {
print("Unsubscribed")
// var intVal: NSInteger = 0
// let valueData:Data = Data(buffer: UnsafeBufferPointer(start: &intVal, count: 1))
// self.peripheralManager.updateValue(valueData, for: self.transferCharacteristic, onSubscribedCentrals: nil)
}
/******* CBCentralManagerDelegate *******/
// Check status of BLE hardware
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if central.state == .poweredOn {
// Scan for peripherals if BLE is turned on
central.scanForPeripherals(withServices: nil, options: nil)
}
else {
// Can have different conditions for all states if needed - show generic alert for now
}
}
// Check out the discovered peripherals to find Sensor Tag
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
print("array2 contains" + "\(self.sensorTagPeripheralArray.count)")
if SensorTag.sensorTagFound(advertisementData) == true {
// Update Status Label'
self.sensorTagPeripheral = peripheral
self.sensorTagPeripheral.delegate = self
self.centralManager.connect(peripheral, options: nil)
if !self.sensorTagPeripheralArray.contains(peripheral)
{
self.sensorTagPeripheralArray.append(peripheral)
self.tagsIds.append("\(peripheral.identifier)")
// self.centralManager.connectPeripheral(peripheral, options: nil)
}
else {
//showAlertWithText(header: "Warning", message: "SensorTag Not Found")
}
}
}
// Discover services of the peripheral
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("connected " + "\(peripheral.identifier)")
print("array contains" + "\(self.sensorTagPeripheralArray.count)")
numberOfTagsSending = numberOfTagsSending + 1
peripheral.discoverServices(nil)
}
// If disconnected, start searching again
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
// print("error")
// print(error)
// self.sensorTagPeripheralArray.arrayRemovingObject(peripheral)
// print(sensorTagPeripheralArray)
numberOfTagsSending = numberOfTagsSending - 1
print("removed")
synchronizer.alreadySynced = false
central.scanForPeripherals(withServices: nil, options: nil)
}
func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any]) {
print("ciekawe")
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
print("looking for p services")
print("discovered services " + "\(peripheral.identifier)")
for service in peripheral.services! {
let thisService = service as CBService
if SensorTag.validService(thisService) {
// Discover characteristics of all valid services
peripheral.discoverCharacteristics(nil, for: thisService)
}
}
}
// Enable notification and sensor for each characteristic of valid service
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
// print("discovered characteristic " + "\(peripheral.identifier)")
var enableValue = 1
let enablyBytes = Data(buffer: UnsafeBufferPointer(start: &enableValue, count: 1))
// print("\n")
for charateristic in service.characteristics! {
print(charateristic.uuid)
let thisCharacteristic = charateristic as CBCharacteristic
if SensorTag.validDataCharacteristic(thisCharacteristic) {
// Enable Sensor Notification
print( "valid char")
// print(thisCharacteristic)
peripheral.setNotifyValue(true, for: thisCharacteristic)
if thisCharacteristic.uuid == MagnetometerDataUUID{
peripheral.readValue(for: thisCharacteristic)
}
print("after notify set")
// print(self.sensorTagPeripheral.services)
}
if SensorTag.validConfigCharacteristic(thisCharacteristic) {
// Enable Sensor
print("more valid")
// print(thisCharacteristic)
// for peripheral in self.sensorTagPeripheralArray{
peripheral.writeValue(enablyBytes, for: thisCharacteristic, type: CBCharacteristicWriteType.withResponse)
}
}
}
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
print(error)
}
// var streamerTag1 = MyStreamer(fileString: "tag1.txt")
// var streamerTag2 = MyStreamer(fileString: "tag2.txt")
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
print(characteristic.value!)
if "\(peripheral.identifier)" == self.tagsIds[0]
{
switch characteristic.uuid
{
case MagnetometerDataUUID:
tag1Compensator.getTrimRegisterData(characteristic.value!)
case IRTemperatureDataUUID:
tag1Temperature = Double(UInt16(littleEndian: (characteristic.value! as NSData).bytes.bindMemory(to: UInt16.self, capacity: characteristic.value!.count).pointee))
case IMUDataUUID:
synchronizer.fillTagArray(characteristic.value!, tag: .first)
default:
return
}
}
else if (self.tagsIds.count > 1) && ("\(peripheral.identifier)" == self.tagsIds[1])
{
switch characteristic.uuid
{
case MagnetometerDataUUID:
tag2Compensator.getTrimRegisterData(characteristic.value!)
case IRTemperatureDataUUID:
tag2Temperature = Double(UInt16(littleEndian: (characteristic.value! as NSData).bytes.bindMemory(to: UInt16.self, capacity: characteristic.value!.count).pointee))
case IMUDataUUID:
synchronizer.fillTagArray(characteristic.value!, tag: .second)
default:
return
}
}
}
}
【问题讨论】：
-
最好为核心蓝牙管理器使用专用队列。当应用程序进入后台时，主队列被挂起，因此如果您的应用程序处于后台，您的应用程序将停止响应 BT 回调。您还可以在许多 SO 核心蓝牙问题中了解其他一些因素。
-
我的应用开启了后台模式，在这个模式下可以正常工作，能否提供一些资源？
标签： ios swift multithreading bluetooth core-bluetooth