CoreBluetooth配对反馈/回调

感觉好像我在这里遗漏了一些东西，但是我如何获得有关密码保护的外围设备配对失败还是成功的反馈？

当我连接受密码保护的外围设备时，会弹出密码 UIAlertView，并且外围设备会立即连接（调用 didConnectPeripheral）并断开连接（didDisconnectPeripheral）。

[bluetoothManager connectPeripheral:peripheral options:nil];

现在，无论我输入正确的密码、错误的密码还是只是按取消：在所有情况下，我都没有收到来自 CoreBluetooth 委托方法的任何反馈。

问题是我如何获得有关此过程的反馈？

问题在这里发布多年后面临同样的问题。令人惊讶的是，苹果没有提供任何关于配对是否成功的回调。但是，可以使用以下步骤得出相同的结论：

1. 声明和初始化：

var centralManager: CBCentralManager?
var myPeripheral: CBPeripheral?
var peripheralManager: CBPeripheralManager?

centralManager = CBCentralManager(delegate: self, queue: DispatchQueue.main)
peripheralManager = CBPeripheralManager.init(delegate: self, queue: DispatchQueue.main )

2. 扫描设备时CBCentralManager is in .poweredOn state:

func centralManagerDidUpdateState(_ central: CBCentralManager) {
   if central.state == .poweredOn {
       centralManager?.scanForPeripherals(withServices: [CBUUID.init(string: "SERVICE-ID")])
   }
}

3. 识别并连接到感兴趣的设备：

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    //Identify the device to be connected
    if peripheral.name?.hasSuffix("DEVICE-SERIAL-NUMBER") ?? false {
        myPeripheral = peripheral
        peripheral.delegate = self
        centralManager?.connect(myPeripheral!, options: nil)
    }
}

4. 发现连接设备的服务以及这些服务的特征

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        peripheral.discoverServices([CBUUID.init(string: "SERVICE-ID-STRING")])
    }

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {       
    let services = peripheral.services!
    let charId = CBUUID.init(string: “CHARACTERISTIC-ID”)
    for service in services {
        peripheral.discoverCharacteristics([charId], for: service)
    }
}

5. 对于具有以下特征之一的.notify属性，写入一些数据，写入类型为.withResponse

    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    let value = 1234
    let data = withUnsafeBytes(of: value) { Data($0) }
    for characteristic in service.characteristics!
    {
        if characteristic.properties.contains(.notify) {
            peripheral.setNotifyValue(true, for: characteristic)
            peripheral.writeValue(data, for: characteristic, type: .withResponse)   
        }
    }
}

6. 检查此写入的响应以确定配对是否成功：

func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) { }

如果由于密码输入无效或用户取消而导致配对不成功，您将收到一条错误消息，提示“身份验证不足”

否则，写入特征将成功，错误对象将为 nil。