当我点击应用程序上的按钮时，没有任何值发送到外围设备。我正在获得外围设备和特征=零。为什么会发生这种情况，我该怎么做才能改变这种情况？我在AppDelegate中拥有所有蓝牙连接编码。
import UIKit
import CoreBluetooth
class TemperatureViewController: UIViewController {
var centralManager: CBCentralManager!
var heartRatePeripheral: CBPeripheral!
var characteristic: CBCharacteristic?
func writeValue(value: Int8) {
let peripheral = heartRatePeripheral //, characteristic = self.characteristic
let data = Data.dataWithValue(value: value)
print("peripheral: \(String(describing: peripheral))")
print("data: \(data)")
print("characteristic: \(String(describing: characteristic))")
peripheral?.writeValue(data, for: characteristic!, type: .withResponse)
print("Working")
}
@IBAction func highButtonTapped(_ sender: UIButton) {
writeValue(value: 2)
}
@IBAction func lowButtonTapped(_ sender: UIButton) {
writeValue(value: 1)
}
@IBAction func offButtonTapped(_ sender: UIButton) {
writeValue(value: 0)
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
extension Data {
static func dataWithValue(value: Int8) -> Data {
var variableValue = value
return Data(buffer: UnsafeBufferPointer(start: &variableValue, count: 1))
}
func int8Value() -> Int8 {
return Int8(bitPattern: self[0])
}
}
这是我的AppDelegate，其中包含所有蓝牙连接代码。不确定这是否有任何不妥之处：
import UIKit
import CoreBluetooth
let heartRateServiceCBUUID = CBUUID(string: "0x180D")
let heartRateMeasurementCharacteristicCBUUID = CBUUID(string: "2A37")
let bodySensorLocationCharacteristicCBUUID = CBUUID(string: "2A38")
var heartRatePeripheral: CBPeripheral!
var centralManager: CBCentralManager!
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var centralManager: CBCentralManager!
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
centralManager = CBCentralManager(delegate: self as! CBCentralManagerDelegate, queue: nil)
return true
}
func applicationWillResignActive(_ application: UIApplication) {
}
func applicationDidEnterBackground(_ application: UIApplication) {
}
func applicationWillEnterForeground(_ application: UIApplication) {
}
func applicationDidBecomeActive(_ application: UIApplication) {
}
func applicationWillTerminate(_ application: UIApplication) {
}
}
extension AppDelegate: CBCentralManagerDelegate {
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {
case .unknown:
print("central.state is .unknown")
case .resetting:
print("central.state is .resetting")
case .unsupported:
print("central.state is .unsupported")
case .unauthorized:
print("central.state is .unauthorized")
case .poweredOff:
print("central.state is .poweredOff")
case .poweredOn:
print("central.state is .poweredOn")
centralManager.scanForPeripherals(withServices: [heartRateServiceCBUUID])
}
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral,
advertisementData: [String: Any], rssi RSSI: NSNumber) {
print(peripheral)
heartRatePeripheral = peripheral
heartRatePeripheral.delegate = self as CBPeripheralDelegate
centralManager.stopScan()
centralManager.connect(heartRatePeripheral)
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("Connected!")
heartRatePeripheral.discoverServices([heartRateServiceCBUUID])
}
}
extension AppDelegate: CBPeripheralDelegate {
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
let services = peripheral.services
for service in services! {
print(service)
peripheral.discoverCharacteristics(nil, for: service)
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService,
error: Error?) {
let characteristics = service.characteristics
for characteristic in characteristics! {
print(characteristic)
if characteristic.properties.contains(.read) {
print("\(characteristic.uuid): properties contains .read")
peripheral.readValue(for: characteristic)
}
if characteristic.properties.contains(.notify) {
print("\(characteristic.uuid): properties contains .notify")
}
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic,
error: Error?) {
switch characteristic.uuid {
case bodySensorLocationCharacteristicCBUUID:
print(characteristic.value ?? "no value")
default:
print("Unhandled Characteristic UUID: \(characteristic.uuid)")
}
}
}