我有一个iOS应用程序，它使用Core Bluetooth连接到V.BTTN智能按钮。在iOS 10中，一切都运行得很好，但是自iOS 11问世以来，恢复过程似乎已经破裂。
当我使用之前配对的按钮启动我的应用程序时，操作系统实际上会调用centralManager:willRestoreState，并且随附的字典包含指向状态为已连接的CBPeripheral对象的指针。就像它在iOS 10中所做的那样。但是，我遇到的问题是当我在外围设备上调用discoverServices时，我从未在peripheral:didDiscoverServices方法中返回任何服务。实际上，该方法或任何其他方法都被调用。
我一直在搜索所有互联网，并且发现人们在按钮配对连接时遇到类似问题，但这些问题通常是外围对象的不正确生命周期管理问题。我相信我的一切设置正确而且不知所措。有谁知道这里会发生什么？
import Foundation
import CoreBluetooth
class SmartButtonManager: NSObject {
//MARK: - Singleton
static let sharedManager = SmartButtonManager()
//MARK: - Properties
var discoveredDevices: [CBPeripheral] {
get {
return perfs
}
}
fileprivate(set) var isBluetoothOn = false
//MARK: - Private Constants & Variables
fileprivate var connectedButtonUUID: String?
fileprivate let queue = DispatchQueue(label: "V.BTTN", qos: .background, attributes: .concurrent, autoreleaseFrequency: .inherit, target: nil)
fileprivate var manager: CBCentralManager?
fileprivate var perfs = [CBPeripheral]()
fileprivate var connectedPerf: CBPeripheral?
fileprivate var isButtonReady = false
//MARK: - Initialization
override init() {
super.init()
}
//MARK: - Configure
func configure(withLaunchOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) {
// create new central manager
manager = CBCentralManager(delegate: self, queue: queue, options: [CBCentralManagerOptionRestoreIdentifierKey: managerIdentifier])
}
}
//MARK: - V.BTTN
extension SmartButtonManager: CBCentralManagerDelegate, CBPeripheralDelegate {
func scanForVbttn() {
perfs.removeAll()
manager?.scanForPeripherals(withServices: services, options: nil)
}
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {
case .poweredOff:
print("[centralManagerDidUpdateState] CB BLE hardware is powered off")
perfs.removeAll()
isBluetoothOn = false
case .poweredOn:
print("[centralManagerDidUpdateState] CB BLE hardware is powered on. Start scanning for peripherals")
isBluetoothOn = true
case .unauthorized:
print("[centralManagerDidUpdateState] CB BLE hardware is not authorized")
case .unsupported:
print("[centralManagerDidUpdateState] CB BLE hardware is not supported")
isBluetoothOn = false
default:
print("[centralManagerDidUpdateState] CB BLE hardware state is unknown")
}
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
print("[centralManager:didDiscover peripheral:advertisementData] CB BLE did discover peripheral with advertisement data: \(advertisementData)")
guard let perfName = advertisementData[CBAdvertisementDataLocalNameKey] as? String else {
print("[centralManager:didDiscover peripheral:advertisementData] peripheral name is unknown")
return
}
if perfName.contains("V.ALRT") {
peripheral.delegate = self
perfs.append(peripheral)
if connectedButtonUUID == perfName {
connect(peripheral: peripheral)
}
}
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("[central:didConnect peripheral:] CB BLE hardware did connect")
handleDidConnect(toPeripheral: peripheral)
}
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
print("[central:didFailToConnect error:] CB BLE peripheral did failed to connect with error: \(String(describing: error))")
connectedPerf = nil
isButtonReady = false
connectedButtonUUID = nil
}
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
print("[central:didDisconnectPeripheral peripheral:] CB BLE peripheral did disconnect")
connectedPerf = nil
isButtonReady = false
connectedButtonUUID = nil
}
func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any]) {
print("[central:willRestoreState dict:] CB BLE hardware will restore state")
print("\(dict)")
guard let ps = dict[CBCentralManagerRestoredStatePeripheralsKey] as? [CBPeripheral] else {
print("[central:willRestoreState dict:] No perfs to restore")
return
}
print("[central:willRestoreState dict:] Will restore perfs")
perfs = ps
print("[central:willRestoreState dict:] Attempt to reconnect to V.BTTN")
print("[central:willRestoreState dict:] perfs \(perfs)")
for p in perfs {
if p.name == connectedButtonUUID {
print("[central:willRestoreState dict:] Connect to perf \(p)")
handleDidConnect(toPeripheral: p)
break
}
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
guard let services = peripheral.services else {
print("[peripheral:didDiscoverServices error:] CB BLE peripheral unable to discover services")
return
}
print("[peripheral:didDiscoverServices error:] BLE peripheral did discover services")
for s in services {
print("[peripheral:didDiscoverServices error:] CB BLE Service \(s.description)")
peripheral.discoverCharacteristics(nil, for: s)
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
print("[peripheral:didDiscoverCharacteristicsFor service:] CB BLE did discover characteristics for service \(service.uuid.description)")
if compareCBUUID(uuid1: service.uuid, uuid2: CBUUID(string: BLE_VSN_GATT_SERVICE_UUID)) {
guard let characteristics = service.characteristics else {
return
}
for aChar in characteristics {
// write the verification key
if aChar.uuid.isEqual(CBUUID(string: BLE_VERIFICATION_SERVICE_UUID)) {
self.writeVerificationKey(forPeripheral: peripheral, characteristic: aChar)
self.enable(peripheral: peripheral)
break
}
}
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
//NOTE: This code has been omitted as there is little need to see this
}
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
print("[peripheral:didWriteValueFor characteristic:] characteristic: \(characteristic.uuid)")
if let e = error {
print("[peripheral:didWriteValueFor characteristic:] error: \(e)")
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateNotificationStateFor characteristic: CBCharacteristic, error: Error?) {
if !characteristic.isNotifying {
print("[peripheral:didUpdateNotificationStateFor:][Characteristic is not notifiying so cancel the connection]")
manager?.cancelPeripheralConnection(peripheral)
}
}
//MARK: - Helpers
fileprivate func writeVerificationKey(forPeripheral peripheral: CBPeripheral, characteristic: CBCharacteristic) {
print("[peripheral:didDiscoverCharacteristicsFor service:] Write verification key")
let data = NSData(bytes: [0x80,0xBE,0xF5,0xAC,0xFF] as [UInt8], length: 5)
peripheral.writeValue(data as Data, for: characteristic, type: CBCharacteristicWriteType.withResponse)
}
fileprivate func handleDidConnect(toPeripheral peripheral: CBPeripheral) {
if let n = peripheral.name {
connectedButtonUUID = n
}
connectedPerf = peripheral
peripheral.delegate = self
peripheral.discoverServices(nil)
isButtonReady = true
}
fileprivate func enable(peripheral: CBPeripheral) {
guard let services = peripheral.services else {
return
}
for service: CBService in services {
if compareCBUUID(uuid1: service.uuid, uuid2: CBUUID(string: BLE_VSN_GATT_SERVICE_UUID)) {
guard let characteristics = service.characteristics else {
return
}
for aChar in characteristics {
if aChar.uuid.isEqual(CBUUID(string: BLE_KEYPRESS_DETECTION_UUID)) {
// enable button
print("[peripheral:didDiscoverCharacteristicsFor service:] Enable short press")
let data = NSData(bytes: [0x02] as [UInt8], length: 1)
peripheral.writeValue(data as Data, for: aChar, type: CBCharacteristicWriteType.withResponse);
} else if aChar.uuid.isEqual(CBUUID(string: BLE_SILENT_NORMAL_MODE)) {
// enable button
print("[peripheral:didDiscoverCharacteristicsFor service:] Enable normal mode")
let data = NSData(bytes: [0x00] as [UInt8], length: 1)
peripheral.writeValue(data as Data, for: aChar, type: CBCharacteristicWriteType.withResponse);
} else if aChar.uuid.isEqual(CBUUID(string: BLE_FALL_KEYPRESS_DETECTION_UUID)) {
// enable fall detection
print("[peripheral:didDiscoverCharacteristicsFor service:] Enable fall detection")
peripheral.setNotifyValue(true, for: aChar)
}
}
}
}
checkBatteryLevel()
}
func disconnectVbttn() {
guard let peripheral = connectedPerf else {
return
}
setVbttnToStealthMode()
manager?.cancelPeripheralConnection(peripheral)
isButtonReady = false
}
fileprivate func compareCBUUID(uuid1: CBUUID, uuid2: CBUUID) -> Bool {
if (uuid1.data as NSData).isEqual(to: uuid2.data) {
return true
}
return false
}
func stopScanning() {
manager?.stopScan()
}
}