func save(blood: BloodData, forKey defaultName: String = "BloodDataKey") {  // or forKey defaultName: String = dataKey

    guard let data = try? NSKeyedArchiver.archivedData(withRootObject: blood, requiringSecureCoding: false) else { return }

    UserDefaults.standard.set(data, forKey: defaultName)

}

func save(blood: BloodData, forKey defaultName: String = "BloodDataKey") {  // or forKey defaultName: String = dataKey

    guard let data = try? NSKeyedArchiver.archivedData(withRootObject: blood, requiringSecureCoding: false) else { return }

    UserDefaults.standard.set(data, forKey: defaultName)

}

func getBlood(forKey defaultName: String = "BloodDataKey") -> BloodData? {  // or forKey defaultName: String = dataKey

    guard let data = UserDefaults.standard.data(forKey: defaultName) else { return nil }

    guard let bloodData = (try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data)) as? BloodData else { return nil }

    return computeData(data: bloodData)

}