SwifUI：我下载的JSON是否保存到coreData？

我一直在摆弄CoreData，这次我试图将下载的JSON保存到core数据中。我不会得到任何错误，直到我尝试显示列表，它将返回空。 任何建议都将不胜感激

模型

AttributeArticle+CoreDataProperties.swift

extension AttributeArticle {

    @nonobjc public class func fetchRequest() -> NSFetchRequest<AttributeArticle> {
        return NSFetchRequest<AttributeArticle>(entityName: "AttributeArticle")
    }

    @NSManaged public var card_artwork_url: String?
    @NSManaged public var content_type: String?
   ...

    public var wrapperCard_artwork_url : String {
        card_artwork_url ?? "Unknown"
    }
    ...
}

我的名单：

    @Environment(\.managedObjectContext) var moc
    
    @FetchRequest(entity: AttributeArticle.entity(), sortDescriptors: []) var articles: FetchedResults<AttributeArticle>

VStack {
        List() {               
            ForEach(articles, id: \.id) { article in
               NavigationLink(destination: ArticleDetailView(articles: article)){
                   ArticleRowView(articles: article)
                   }
               }
            }
         }.onAppear {
            if self.articles.isEmpty {
                print("Articles is empty \(self.articles)")
                Article.loadDataToCD(moc: self.moc)
            }

@Environment（\.managedObjectContext）变量moc
@FetchRequest（实体：AttributeArticle.entity（），sortDescriptors:[]）var文章：FetchedResults
VStack{
列表（）{
ForEach（articles，id:\.id）{articles in
导航链接（目的地：ArticleDetailView（文章：文章））{
ArticleRowView（文章：文章）
}
}
}
}奥纳佩尔先生{
如果self.articles.isEmpty{
打印（“文章为空\（self.Articles）”）
Article.loadDataToCD（moc:self.moc）
}

---

很抱歉发了这么长的帖子，感谢您的帮助！

您没有收到错误，因为您忽略了解码错误。有一个错误。谢谢您，我已修复，列表已显示。谢谢您为我指出这一点！

class Article {
    
    static func loadDataFromJSON(completion: @escaping ([ArticleData]) -> ()) {    
        let stringURL = "https://api.jsonbin.io/b/5ed679357741ef56a566a67f"
        
        guard let url = URL(string: stringURL) else { return }
        
        let request = URLRequest(url: url)
        
        URLSession.shared.dataTask(with: request) {
            data, response, error in
            
            guard let data = data else {
                print("No data in response \(error?.localizedDescription ?? "No data response")")
                return
            }
            
            if let decoderLoadedUser = try? JSONDecoder().decode([ArticleData].self, from: data) {
                
                completion(decoderLoadedUser)
                
            }
        }.resume()
    }
    
    
    
    static func loadDataToCD(moc: NSManagedObjectContext) {
        loadDataFromJSON { (articles) in
            DispatchQueue.main.async {
                
                var tempArticles = [AttributeArticle]()
                for article in articles {
                    
                    let newArticle = AttributeArticle(context: moc)
                    newArticle.name = article.attributes.name
                    newArticle.card_artwork_url = article.attributes.card_artwork_url
                    ... so on
                    ...
                    tempArticles.append(newArticle)
                }
                do {
                    try moc.save()
                } catch let error {
                    print("Could not save data: \(error.localizedDescription)")
                }
            }
        }
    }
    
}

    @Environment(\.managedObjectContext) var moc
    
    @FetchRequest(entity: AttributeArticle.entity(), sortDescriptors: []) var articles: FetchedResults<AttributeArticle>

VStack {
        List() {               
            ForEach(articles, id: \.id) { article in
               NavigationLink(destination: ArticleDetailView(articles: article)){
                   ArticleRowView(articles: article)
                   }
               }
            }
         }.onAppear {
            if self.articles.isEmpty {
                print("Articles is empty \(self.articles)")
                Article.loadDataToCD(moc: self.moc)
            }