[swift]CoreBluetooth(Service)

CBCentralManager：藍芽管理中心，做外部設備搜尋、連接。

CBPeripheral：外部設備

CBCharacteristic：外部設備的特徵。

首先要在info.plist裡設定新增藍芽服務。然後做宣告，如下：

var centralManager: CBCentralManager = CBCentralManager.init(delegate: self, queue: .main)

判斷手機藍牙狀態：

// 判斷手機藍牙狀態
func centralManagerDidUpdateState(_ central: CBCentralManager) {
    switch central.state {
        case .resetting:
            print("resetting")
        case .unsupported:
            print("unsupported")
        case .unauthorized:
            print("unauthorized")
        case .poweredOff:
            print("poweredOff")
        case .poweredOn:
            print("poweredOn")
            central.scanForPeripherals(withServices: [CBUUID.init(string: service_UUID)], options: nil)
    default:
        print("unknown")
    }
}

發現符合要求的外設：

/** 發現符合要求的外設 */
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    self.peripheral = peripheral
    // 根據外設名稱來過濾
//        if (peripheral.name?.hasPrefix("WH"))! {
//            central.connect(peripheral, options: nil)
//        }
    self.centralManager?.stopScan()
    central.connect(peripheral, options: nil)
}

連接成功的回調：

/** 連接成功 */
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    peripheral.delegate = self
    peripheral.discoverServices([CBUUID.init(string: service_UUID)])
    print("連接成功")
}

連接失敗的回調：

/** 連接失敗的回調 */
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
    print("連接失敗")
}

斷開連接的回調：

/** 斷開連接 */
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
    print("斷開連接")
    // 重新連接
    central.connect(peripheral, options: nil)
}

發現服務的回調：

/** 發現服務 */
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    for service: CBService in peripheral.services! {
        print("外設中的服務有：\(service)")
    }

    //本例的外設中只有一個服務
    let service = peripheral.services?.last
    
    // 根據UUID尋找服務中的特徵
    peripheral.discoverCharacteristics([CBUUID.init(string: characteristic_UUID)], for: service!)
}

發現特徵的回調：

/** 發現特徵 */
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    for characteristic: CBCharacteristic in service.characteristics! {
        print("外設中的特徵有：\(characteristic)")
    }
    self.characteristic = service.characteristics?.last
    
    // 讀取特徵裏的數據
    peripheral.readValue(for: self.characteristic!)
    
    // 訂閱
    peripheral.setNotifyValue(true, for: self.characteristic!)
}

訂閱狀態的回調：

/** 訂閱狀態 */
func peripheral(_ peripheral: CBPeripheral, didUpdateNotificationStateFor characteristic: CBCharacteristic, error: Error?) {
    if let error = error {
        print("訂閱失敗: \(error)")
        return
    }
    
    if characteristic.isNotifying {
        print("訂閱成功")
    } else {
        print("取消訂閱")
    }
 }

接收到數據的回調：

/** 接收到數據 */
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    let data = characteristic.value
    print(String.init(data: data!, encoding: String.Encoding.utf8)!)
}

主動傳送：

//主動傳送
func didClickPost(_ sender: Any) {
    self.peripheral?.writeValue(Data(), for: self.characteristic!, type: CBCharacteristicWriteType.withResponse)
}

寫入數據：

/** 寫入數據 */
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
    print("寫入數據")
}

主動接收：

//主動接收
func didClickGet(_ sender: Any) {
    self.peripheral?.readValue(for: self.characteristic!)
}