swift3 字元轉換

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

        if characteristic.uuid.uuidString == "FFF4" {

            guard let data = characteristic.value else {

                return

            }

            let dataString = String(data: data, encoding: String.Encoding.unicode)

            var uintData = [UInt8](repeating:0, count:data.count)

            data.copyBytes(to: &uintData, count: data.count)

            print ("uintData = \(uintData)")

            print ("data = \(data)")

            print ("unicode: \(dataString)")

            print ("characteristic = \(characteristic)")

        }

uintData = [6]

data = 1 bytes

unicode: Optional("")

characteristic = <CBCharacteristic: 0x1700b2300, UUID = FFF4, properties = 0x10, value = <06>, notifying = YES>