ios - 无法从 iOS 中的 BLE 设备获取数据/服务

Question

我需要连接一个 BLE 设备，然后处理通过其中不同按钮发送的数据。
为此，我编写了以下代码。

import CoreBluetooth
class HomeViewController: UIViewController,CBPeripheralDelegate,CBCentralManagerDelegate 
{
    var centralManager : CBCentralManager!
    var peri : CBPeripheral!
    override func viewDidLoad()
    {
        super.viewDidLoad()
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }
    func centralManagerDidUpdateState(central: CBCentralManager) {
        if central.state == .Unknown
        {
            print("Unknown")
        }
        else if central.state == .Unsupported
        {
            print("Unsupported")
        }
        else if central.state == .Unauthorized
        {
            print("Unauthorized")
        }
        else if central.state == .Resetting
        {
            print("Resetting")
        }
        else if central.state == .PoweredOn
        {
            print("Powered On")
            startScan()
        }
        else if central.state == .PoweredOff
        {
            print("Powered Off")
        }
    }
    func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
        print("Discovered: \(peripheral.name) at \(RSSI)")
        print("AdvertisementData:\(advertisementData)")

        if peri != peripheral
        {
            peri = peripheral
            centralManager.connectPeripheral(peripheral, options: nil)
        }
    }
    func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
        print("Failed to connect \(peripheral) cause of \(error)")
    }

    func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
        print("connected to \(peripheral)")
//        centralManager.stopScan()
        print("Available services:\(peripheral.services)")
    }
    func peripheral(peripheral: CBPeripheral, didDiscoverIncludedServicesForService service: CBService, error: NSError?) {
        print("Services\(service) and error\(error)")
    }
    func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {
        print("Services and error\(error)")
    }
    func startScan(){
        print("Scanning...")
        centralManager.scanForPeripheralsWithServices(nil, options: nil)
    }
}

这是我的这段代码日志。

Powered On
Scanning...
Discovered: Optional("**** BLE") at 127
AdvertisementData:["kCBAdvDataIsConnectable": 1, "kCBAdvDataServiceUUIDs": (
    1802
)]
connected to <CBPeripheral: 0x12756d910, identifier = 6197****-EB0A-F1E8-BEF4-1AFAC629C5BC, name = **** BLE, state = connected>
Available services:nil

这是从 BLE 设备单击一个按钮时生成的输出。但是当点击另一个按钮时，我无法接收或读取数据。
同一应用的 Android 开发者已经集成了这两个按钮。
所以设备没有任何问题。
任何人都可以帮助我指导我在这段代码中出错的地方吗？？

Answer 1

Pandafox 的回答非常完美，只是缺少一件事。
这是外设的设置委托(delegate)。

这是发现外围设备、连接到它并发现其服务和特征的完整代码。

1.连接外设

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
    print("Discovered: \(peripheral.name) at \(RSSI)")
    print("AdvertisementData:\(advertisementData)")

    if peri != peripheral
    {
        peri = peripheral
        peri.delegate = self
        centralManager.connectPeripheral(peri, options: nil)
    }
}

1. 连接失败或成功
   

   func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
       print("Failed to connect \(peripheral) cause of \(error)")
   }
   
   func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
       print("connected to \(peripheral)")
   //        centralManager.stopScan()
       peripheral.discoverServices(nil)
   }
   

3.发现服务

func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {
        print("Services:\(peripheral.services) and error\(error)")
        if let services = peripheral.services {
            for service in services {
                peripheral.discoverCharacteristics(nil, forService: service)
            }
        }
    }

1. 发现特征并设置通知

   func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?)
       {
           print("peripheral:\(peripheral) and service:\(service)")
           for characteristic in service.characteristics!
           {
               peripheral.setNotifyValue(true, forCharacteristic: characteristic)
           }
       }
   

2. 处理更新特征值的通知

   func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?)
       {
           print("characteristic changed:\(characteristic)")
       }