如何为@NSManaged属性PFObject子类设置初始值? [英] How to set an initial value for @NSManaged property PFObject Subclass?

问题描述

我有一个名为Attendee的PFObject子类.在此类中，有一个我称为isFavorite的实例变量.下面是它的类定义:

I have a subclass of PFObject called Attendee. In this class, there is a instance variable I have called isFavorite. Below is its class definition:

@NSManaged var isFavorite: Bool

这是设备本地的实例变量，我从未将其同步到服务器.另外，我从不显式实例化Attendee类，而是通过从PFObject进行类型转换来创建它.我想将上面的var设置为具有false的初始值.我将如何实现呢?

This is an instance var that is local to the device and I never sync it up to the server. In addition, I never explicitly instantiate the Attendee class, but rather create it by typecasting from PFObject. I would like to set the above var to have an initial value of false. How would I achieve this?

推荐答案

var isFavorite: Bool {
    get {
        if let isFavorite = self["isFavorite"] as? Bool {
            return isFavorite
        }
        return false //default
    }
    set {
        self["isFavorite"] = newValue
    }
}

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