繼承和構造函數。 在super.init之前自用

Question

我是繼承的新手，我想了解如何以最佳方式創建構造函數。 我收到錯誤Must call a designated initializer of the superclass 'Base'

class Base{
    var id:String
    var link:String

    convenience init?(json: [String: Any]) {
        guard let id = json["id"] as? String,
            let link = json["link"] as? String else{
                print("Failed Base Class Init!")
                return nil
        }
        self.init(id: id, link: link)
    }

    init(id: String, link: String) {
        self.id = id
        self.link = link
    }
}

class Image: Base{
    func addImageToView(imageView: UIImageView){
        Alamofire.request(self.link).responseImage { response in
            if let img = response.result.value {
                imageView.image = img
            }
        }
    }
}

class Gallery:Base{
    var images:[Image] = []

    init?(json: [String: Any]){
        super.init(json: json) // Here i get <- Must call a designated initializer of the superclass 'Base'
        guard let tab = json["images"] as? [[String:Any]] else{
            print("Failed Gallery Image Init!")
            return nil
        }
        images = tab.compactMap{return Image(json: $0)}
    }
}

如何使我的班級畫廊從json創建圖像表並初始化id和鏈接？

Answer 1

使init?(json （也）指定初始化器

init?(json: [String: Any]) {
    guard let id = json["id"] as? String,
        let link = json["link"] as? String else{
            print("Failed Base Class Init!")
            return nil
    }
    self.id = id
    self.link = link
}

並在子類中覆蓋它

override init?(json: [String: Any]) {
  super.init(json: json) 
  ...