我正在使用Ti sensortag来玩蓝牙和传感器。我的目标是让气压计和按钮工作。按下时按钮会发出通知，但气压计根本不会通知或更改其值。这是代码：
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate{
var centralManager:CBCentralManager!
var blueToothReady = false
var connectingPeripheral: CBPeripheral!
let data = "01".dataUsingEncoding(NSUTF8StringEncoding)
@IBOutlet weak var textField: UITextView!
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidLoad() {
super.viewDidLoad()
startUpCentralManager()
}
func startUpCentralManager() {
centralManager = CBCentralManager(delegate: self, queue: nil)
}
func discoverDevices() {
centralManager.scanForPeripheralsWithServices(nil, options: nil)
}
func centralManager(central: CBCentralManager!, didDiscoverPeripheral peripheral: CBPeripheral!, advertisementData: (NSDictionary), RSSI: NSNumber!) {
println("Discovered: \(peripheral.name)")
textField.text = textField.text + "Discovered: \(peripheral.name)\n"
self.connectingPeripheral = peripheral
centralManager.stopScan()
self.centralManager.connectPeripheral(peripheral, options: nil)
}
func centralManagerDidUpdateState(central: CBCentralManager!) { //BLE status
var msg = ""
switch (central.state) {
case .PoweredOff:
msg = "CoreBluetooth BLE hardware is powered off"
println("\(msg)")
case .PoweredOn:
msg = "CoreBluetooth BLE hardware is powered on and ready"
blueToothReady = true;
case .Resetting:
var msg = "CoreBluetooth BLE hardware is resetting"
case .Unauthorized:
var msg = "CoreBluetooth BLE state is unauthorized"
case .Unknown:
var msg = "CoreBluetooth BLE state is unknown"
case .Unsupported:
var msg = "CoreBluetooth BLE hardware is unsupported on this platform"
}
textField.text = textField.text + "\(msg)\n"
println(msg)
if blueToothReady {
discoverDevices()
}
}
func centralManager(central: CBCentralManager!,didConnectPeripheral peripheral: CBPeripheral!)
{
peripheral.delegate = self
peripheral.discoverServices([CBUUID.UUIDWithString("F000AA40-0451-4000-B000-000000000000"),CBUUID.UUIDWithString("FFE0")])
println("Connected")
textField.text = textField.text + "Connected\n"
}
func peripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!)
{
if let servicePeripherals = peripheral.services as? [CBService]
{
for servicePeripheral in servicePeripherals
{
println("Service: \(servicePeripheral.UUID)")
textField.text = textField.text + "Service: \(servicePeripheral.UUID)\n"
peripheral.discoverCharacteristics(nil, forService: servicePeripheral)
}
}
}
@IBAction func refreshBLE(sender: UIButton) {
centralManager.scanForPeripheralsWithServices(nil, options: nil)
}
func peripheral(peripheral: CBPeripheral!, didDiscoverCharacteristicsForService service: CBService!, error: NSError!) {
if let charactericsArr = service.characteristics as? [CBCharacteristic]
{
for charactericsx in charactericsArr
{
peripheral.setNotifyValue(true, forCharacteristic: charactericsx)
println("Characteristic: \(charactericsx)")
textField.text = textField.text + "Characteristic: \(charactericsx)\n"
peripheral.readValueForCharacteristic(charactericsx)
}
}
}
func peripheral(peripheral: CBPeripheral!, didUpdateValueForCharacteristic characteristic: CBCharacteristic!, error: NSError!) {
if var data :NSData = characteristic.value {
textField.text = textField.text + "Data: \(characteristic.value)\n Notifying: \(characteristic.isNotifying)\n"
println("Data: \(characteristic.value)\n Notifying: \(characteristic.isNotifying)")
}
}
}
这是属性表：http://processors.wiki.ti.com/images/a/a8/BLE_SensorTag_GATT_Server.pdf
为什么我只获得气压计的初始值而没有通知？