ios - swift -CoreData

Question

我有一个自定义的 NSManagedObject:

import Foundation
import CoreData
@objc(Article)

class Article: NSManagedObject {

    @NSManaged var articleID: String
    @NSManaged var isFavorite: Bool
    init(entity: NSEntityDescription, insertIntoManagedObjectContext context: NSManagedObjectContext?, articleID: String, isFavorite: Bool) {
        super.init(entity: entity, insertIntoManagedObjectContext: context)
        self.articleID = articleID
        self.isFavorite = isFavorite
    }

    override init(entity: NSEntityDescription, insertIntoManagedObjectContext context: NSManagedObjectContext?) {
        super.init(entity: entity, insertIntoManagedObjectContext: context)
    }
}

但是当我尝试向 CoreData 添加新条目时出现错误:

let articleEntity = NSEntityDescription.entityForName("Article", inManagedObjectContext: self.context!)
let newArticle = Article(entity: articleEntity!, insertIntoManagedObjectContext: self.context!)
newArticle.articleID = articleID
newArticle.isFavorite = true

Use of unresolved identifier 'Article'

Answer 1

从上面的信息来看，您似乎没有在 coredata 的配置中为实体添加类。确保您已在 .xcdatamodeld 文件的配置中将类映射到实体。您可以查看以下示例。