Question

我需要连接BLE设备，然后根据其中的不同按钮发送数据为此，我写了下面的代码。

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

从BLE设备单击一个按钮时会生成此输出。但是，当单击另一个按钮时，我无法接收或读取数据同一个应用程序的Android开发人员已与两个按钮集成所以设备没有任何问题任何人都可以帮我指导我在这段代码中出错的地方吗？

Answer 1

Pandafox的答案是完美的，只是遗漏了一件事。
哪个是设置外围代表。

以下是发现外设，连接外设并发现其服务和特性的完整代码。

1.连接外围设备

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)
    }
}

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.DiscoverServices

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)
            }
        }
    }

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)
        }
    }

处理特征更新值的通知

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

Answer 2

连接到设备后，您还必须发现服务和特性。

例如，在“didConnectPeripheral”方法中，您必须执行以下操作：

 func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
    print("connected to \(peripheral)")
    peripheral.delegate = self
    peripheral.discoverServices(nil)
    print("Discovering services!")
}

然后：

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

然后你必须处理每个特征：

 func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError)

您必须记住手动存储每个特征，否则将取消分配。

要接收流式数据（通知），您必须为每个特性启用通知。

peripheral.setNotifyValue(true, forCharacteristic: characteristic)

您还必须实施：

 func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError)

命令处理传入的值。

正如您所看到的，开始时需要相当多的样板代码。

Answer 3

连接到外围设备后，您必须使用要发现的服务的UUID在外围设备上呼叫discoverServices，然后您必须发现该服务的特征。如果您想在单击按钮时进行更新，则必须打开与该按钮对应的特征的通知

如果您仍需要帮助，我强烈推荐苹果提供此链接以供后续阅读。它以一种比我在这里描述的更好的方式逐步描述你需要做的事情。

Apple BLE Guide

没有从ios中的BLE设备获取数据/服务

3 个答案: