初始化不带可选选项的模型对象

Question

模型对象是使用 JSONDecoder 方法填充的。由于需要在表视图上传递它，我需要在 UI 端初始化 KBArticle 类型的局部变量。有没有可能的方法可以在没有可选的情况下初始化 KBArticle 的对象或直接访问内部数组？

var kbArticle = KBArticle（）

调用中缺少参数"from"的参数。插入"发件人：<#解码器#>"

/// UI Side
var kbArticle = KBArticle()
override func viewDidLoad() {
    super.viewDidLoad()
    /// Web services call method
    SDKCore.getInstance.getKbService().fetchKbArticles(with: topicID) { (result) in
        switch result {
        case .success(let kbArticle):
            self.kbArticle = kbArticle
            DispatchQueue.main.async { 
                self.tableView.reloadData() 
            }
        case .failed(let e):
            print("Error=(e)")
        }
    }
}

// Model Class in SDK
public struct KBArticle: Codable {
    public let id: Int
    public let topic: String
    public let articleCount: Int
    public let articles: [Article]
}
public struct Article: Codable {
   public let id: Int
   public let subject: String
}
 /// Method in SDK
 public func fetchKbArticles(with topicId: Int, completionHandler: @escaping (ResultModel<KBArticle, Error>) -> Void) {
    let request = GetKBArticles(topicId: topicId)
    
    Networking.shared.performRequest(request) { (response) in
        switch response {
        case .success(let response):
            do {
                let decoder = JSONDecoder()
                let result = try decoder.decode(KBArticle.self, from: response.data!)
                completionHandler(.success(result))
                
            } catch let error {
                completionHandler(.failed(error))
            }
        case .failed(let error):
            completionHandler(.failed(error))
        }
    }
}

我必须在结构kbArticle使用此articles来提供我的表视图数据源。可以使用 nil 值初始化kbArticle对象而无需主初始化???

Answer 1

如果需要没有 optional 的新对象，可以为

前任：

public struct KBArticle: Codable {
    public var id: Int = 0
    public var topic: String = ""
    public var articleCount: Int = 0
    public var articles: [Article]?
}
public struct Article: Codable {
    public var id: Int = 0
    public var subject: String = ""
}

用途：let myObj = KBArticle()

请检查此答案