ios - Swift - 嵌套对象的 JSON 序列化

Question

我有一个从 JSON 创建的对象(序列化)。该对象有一个 id 属性，代表系统中存储的另一个对象。如何在序列化过程中获取嵌套对象？

import UIKit


class Person: Codable {
    let firstName: String
    let lastName: String
    let addressId: String
    let address: Address // How to create it during serialisation

    private enum CodingKeys: String, CodingKey {
        case firstName
        case lastName
        case addressId = "addressId"
    }

    init(firstName: String, lastName: String, addressId:String) {
        self.firstName = firstName
        self.lastName = lastName
        self.addressId = addressId
    }

    required init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        self.firstName = try values.decode(String.self, forKey: .firstName)
        self.lastName = try values.decode(String.self, forKey: .lastName)
        self.addressId = try? values.decode(URL.self, forKey: .addressId)
    }
}

struct PersonsList : Codable {
    let persons: [Person]
}

class Address {

   static func getAddress(addressId: String) -> Address
   {
         //some code
         return address
   }
}

Answer 1

使用惰性属性来实现

编辑

选项1

 lazy var address:Address = { [unowned self] in
    return Address.getAddress(addressId: self.addressId)

  }()

选项2

var  adreess1:Address {
    return Address.getAddress(addressId: self.addressId)
}