Swift中对象的自动JSON序列化和反序列化 [英] Automatic JSON serialization and deserialization of objects in Swift

问题描述

我正在寻找一种在Swift中自动序列化和反序列化类实例的方法.假设我们定义了以下类……

I'm looking for a way to automatically serialize and deserialize class instances in Swift. Let's assume we have defined the following class …

class Person {
    let firstName: String
    let lastName: String

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

…和Person实例:

let person = Person(firstName: "John", lastName: "Doe")

person的JSON表示形式如下:

The JSON representation of person would be the following:

{
    "firstName": "John",
    "lastName": "Doe"
}

现在，这是我的问题:

1. 如何序列化person实例并获取上述JSON，而不必手动将类的所有属性添加到变成JSON的字典中?
2. 如何反序列化上面的JSON并获取静态类型为Person的实例化对象?同样，我不想手动映射属性.

1. How can I serialize the person instance and get the above JSON without having to manually add all properties of the class to a dictionary which gets turned into JSON?
2. How can I deserialize the above JSON and get back an instantiated object that is statically typed to be of type Person? Again, I don't want to map the properties manually.

---

以下是您使用C#使用 Json.NET 的方式:

---

Here's how you'd do that in C# using Json.NET:

var person = new Person("John", "Doe");
string json = JsonConvert.SerializeObject(person);
// {"firstName":"John","lastName":"Doe"}

Person deserializedPerson = JsonConvert.DeserializeObject<Person>(json);

推荐答案

如 WWDC2017 @ 24:48( Swift 4 )，我们将能够使用Codable协议.例子

As indicated in WWDC2017 @ 24:48 (Swift 4), we will be able to use the Codable protocol. Example

public struct Person : Codable {
   public let firstName:String
   public let lastName:String
   public let location:Location
}

序列化

let payload: Data = try JSONEncoder().encode(person)

反序列化

let anotherPerson = try JSONDecoder().decode(Person.self, from: payload)

请注意，所有属性都必须符合Codable协议.

Note that all properties must conform to the Codable protocol.

替代可以是 JSONCodable ，由 Swagger的代码生成器.

An alternative can be JSONCodable which is used by Swagger's code generator.

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