如何在iOS上的核心数据中存储Swift Struct？ [英] How do I store a Swift Struct in Core Data on iOS?

问题描述

目前我将我的一个类作为NSData存储在plist中，显然这不是一个好方法。

At the moment I'm storing one of my classes as NSData in a plist and obviously that isn't a good way to do it.

所以我'我试图设置核心数据，但我的班级有Structs。这就是我所拥有的：

So I'm trying to set up Core Data, but my class has Structs. This is what I have:

import Foundation
import CoreData

class Favourite: NSManagedObject {
    @NSManaged var origin: Stop

    struct Stop {
        var name: String;
        var id: String;
    }
}

但这不好，因为它说

属性不能标记为@NSManaged，因为其类型无法在Objective-C中表示

此外，如果没有发生此错误，我不知道我在xcdatamodeld文件中设置了什么。

Furthermore, if this error did not occur, I don't know what I'd set it up as in my xcdatamodeld file.

我想我可以存储值在结构中并分配对象的初始化？这是最优/干净的方式吗？

I guess I could store the values in the struct and assign on initialisation of the object? Is this the most optimal/clean way?

推荐答案

我会这样做：

import Foundation
import CoreData

    struct Stop {
       var name: String;
       var id: String;
    }

    class Favourite: NSManagedObject {

        @NSManaged var name: String
        @NSManaged var id: String

        var stop : Stop {
           get {
                return Stop(name: self.name, id: self.id)
            }
            set {
                self.name = newValue.name
                self.id = newValue.id
            }
         }
    }

非常有趣的文章，你应该阅读： http：/ /www.jessesquires.com/better-coredata-models-in-swift/

Very interesting article, you should read: http://www.jessesquires.com/better-coredata-models-in-swift/

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