class Animal: NSObject, NSCoding {
    
    private var id : Int!
    private var name : String!
    
    init(id: Int, name: String) {
        self.id = id
        self.name = name
    }
    
    //エンコード関数 forKeyは任意の文字列
    func encode(with coder: NSCoder) {
        coder.encode(id, forKey: "id")
        coder.encode(name, forKey: "name")
    }
    
    //デコード関数 forKeyは任意の文字列
    required init?(coder aDecoder: NSCoder) {
        id = aDecoder.decodeObject(forKey: "id") as? Int
        name = aDecoder.decodeObject(forKey: "name") as? String
    }
    
    //自作クラス->Data型へ変換
    private static func archiveDataArray(indexDataArray: [Animal]) -> Data {
        do {
            // iOS11以降
            if #available(iOS 11.0, *) {
                let data = try NSKeyedArchiver.archivedData(withRootObject: indexDataArray, requiringSecureCoding: false)
                return data
            // iOS11以前
            } else {
                let data = NSKeyedArchiver.archivedData(withRootObject: indexDataArray)
                return data
            }
        } catch {
            fatalError("エンコード失敗")
        }
    }
    
    //UserDefaultsへデータを保存
    public func saveDataArray(indexDataArray: [Animal]) {
        UserDefaults.standard.set(Animal.archiveDataArray(indexDataArray: indexDataArray), forKey: "")
    }
    
    //UserDefaultsからデータ取得
    public func getData() -> [Animal] {
        var dataArray = [Animal]()
        
        let storedData = UserDefaults.standard.data(forKey: "")
        
        if storedData != nil {
            // iOS11以降
            if #available(iOS 11.0, *) {
                if let storedData = UserDefaults.standard.object(forKey: "") as? Data {
                    guard let unarchivedObject = try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(storedData) as? [Animal] else {
                            return [Animal]()
                    }
                    dataArray = unarchivedObject!
                }
            // iOS11以前
            } else {
                if let storedData = UserDefaults.standard.object(forKey: "") as? Data {
                    guard let unarchivedObject = NSKeyedUnarchiver.unarchiveObject(with: storedData) as? [Animal] else {
                        return [Animal]()
                    }
                    dataArray = unarchivedObject
                }
            }
        }
        return dataArray
    }
}