自定义嵌套对象的 Swift 编码技术？

Question

I am need to get encoding for the nested object

class person {
var name: String?
var phone: String?
var address: Address?
}

class Address {
var area: String?
var city: String?
}

I tried

let data = try? JSONEncoder().encode(person)
let json = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String: Any]

but Address key value pair is not getting.

Answer 1

Just implement Encodable

class Person: Encodable {
  var name: String?
  var phone: String?
  var address: Address?
}

class Address: Encodable {
  var area: String?
  var city: String?
}
let address = Address()
address.area = "Area"
address.city = "City"
let person = Person()
person.name = "name"
person.address = address

let encoded = try JSONEncoder().encode(person)

Answer 2

struct Person: Encodable {
    var name, phone: String
    var address: Address
}

struct Address: Encodable {
    var area, city: String
}

• conform your models which you need to encode to protocol Encodable
• types should start with big capital letter
• if you're sure that properites won't be nil don't make them optional
• you can make your models structs instead of classes

---

Then just encode your object

let data = try? JSONEncoder().encode(person)

---

When you need print your encoded data, you need to convert them to String

let data = try! JSONEncoder().encode(person)
let json = String(data: data, encoding: .utf8) ?? ""

if you need to encode object with key "person" and person object as value, encode dictionary

let data = try! JSONEncoder().encode(["person": person])
let json = String(data: data, encoding: .utf8) ?? ""