Swift 4可编码阵列 [英] Swift 4 Codable Array's

问题描述

所以我有一个API路由，该路由返回一个JSON对象数组。例如：

So I have an API route that returns a JSON array of objects. For example:

[
    {"firstname": "Tom", "lastname": "Smith", "age": 31},
    {"firstname": "Bob", "lastname": "Smith", "age": 28}
]

我正在尝试设想如何使用Swift中的新可编码功能将它们转换为类中的两个对象。因此，如果我有一个可编码的人员类，我想接受该响应并将它给我两个人对象。

I'm trying to envision how to use the new codable feature in Swift for to convert those into two objects in a class. So if I have a person class that is codable I would want to take that response and have it give me two person objects.

我还使用Alamofire来处理

I'm also using Alamofire to handle the requests.

我该怎么做？到目前为止，我所看到的与可编码内容相关的所有内容都只允许1个对象。而且我还没有看到与Alamofire或Web框架的任何集成。

How can I do this? So far everything I've seen related to the codable stuff only allows 1 object. And I haven't seen any integration with Alamofire or a web framework.

推荐答案

有关Alamofire 5的更新： responseJSONDecodable 。

Update regarding Alamofire 5: responseJSONDecodable.

struct Person: Codable {
    let firstName, lastName: String
    let age: Int

    enum CodingKeys : String, CodingKey {
        case firstName = "firstname"
        case lastName = "lastname"
        case age
    }
}

Alamofire.request(request).responseJSONDecodable { (response: DataResponse<Person>) in
    print(response)
}

---

Alamofire 4目前不会添加可编码支持（请参见< a href = https://github.com/Alamofire/Alamofire/issues/2177 rel = noreferrer>＃2177 ），则可以改用以下扩展名： https://github.com/Otbivnoe/CodableAlamofire 。

---

Alamofire 4 won't add Codable support for now (see #2177), you can use this extension instead: https://github.com/Otbivnoe/CodableAlamofire.

let jsonData = """
[
    {"firstname": "Tom", "lastname": "Smith", "age": 31},
    {"firstname": "Bob", "lastname": "Smith", "age": 28}
]
""".data(using: .utf8)!

struct Person: Codable {
    let firstName, lastName: String
    let age: Int

    enum CodingKeys : String, CodingKey {
        case firstName = "firstname"
        case lastName = "lastname"
        case age
    }
}

let decoded = try! JSONDecoder().decode([Person].self, from: jsonData)

示例： http://swift.sandbox.bluemix.net/#/repl/59a4b4fad129044611590820

使用CodableAlamofire：

Using CodableAlamofire:

let decoder = JSONDecoder()
Alamofire.request(url).responseDecodableObject(keyPath: nil, decoder: decoder) { (response: DataResponse<[Person]>) in
    let persons = response.result.value
    print(persons)
}

keypath 对应于结果包含在JSON结构中的路径。例如：

keypath corresponds to the path where the results are contained in the JSON structure. E.g:

{
    "result": {
        "persons": [
            {"firstname": "Tom", "lastname": "Smith", "age": 31},
            {"firstname": "Bob", "lastname": "Smith", "age": 28}
        ]
    }
}

键路径 => results.persons

[
    {"firstname": "Tom", "lastname": "Smith", "age": 31},
    {"firstname": "Bob", "lastname": "Smith", "age": 28}
]

keypath => nil （空的 keypath 引发异常）

keypath => nil (empty keypath throws an exception)

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