Swift：在Core Data中存储自定义类的数组

import Foundation
import UIKit

class Reptile_ {

    private var _name: String?
    private var _dateOfBirth: String?
    private var _morph: String?
    private var _breed: String?
    private var _feedingPeriodInDays: Int?
    private var _reminderTime: NSDate?
    private var _idealTemperatureAtDay: String?
    private var _idealTemperatureAtNight: String?
    private var _gender: Gender?
    private var _image: UIImage?
    private var _imageHeader: UIImage?

    private var _sheddings: [Shedding_]?
    private var _feedings: [Feeding_]?
    private var _defecations: [Defecation_]?
    private var _weights: [Weight_]?
    private var _lengths: [Length_]?
    private var _others: [Others_]?

}

例如,Weight_类看起来像这样：

import Foundation

class Weight_ {

    private var _date: NSDate?
    private var _weight: Double?

}

我可以使用Core Data来保存单个类,其中包含一些属性如字符串,布尔数据……但我不知道如何保存自定义对象的数组？

我已经读过一些我需要用基础Reptile类创建Relationships(一对多)的地方.所以我做到了这导致了这个：

这是添加自定义对象数组的正确方法吗？如果是这样,我如何继续(只需单击’CreateNSManagedObject Subclass …’？)？如何向阵列添加实例？我该怎么看？