如何从复杂的JSON响应中创建结构模型

Question

我试图从swift的api中消费数据，json数据已成功交付回应用程序，但从我的后端json响应非常复杂，因此为我的模型形成结构非常困难。我只能检索简单字符串但如果我添加对象和数组一切都停止工作

[
{
"type": "movie",
"id": "ffff-ddd968-4cf0-a939-8skeu",
"title": "Sorority Row",
"description": "When five laldkdk",
"categories": [],
"genres": [
"Mystery",
"Horror"
],
"links": {
"amazonPrime": [
{
"link": "somelink",
"format": "native_ios"
},
{
"link": "somelink",
"format": "native_ios"
}
],
"appleTvPlus": [],
"disneyPlus": []
"iTunes": [
{
"link": "www.somelink",
"format": "webview_computer"
}
],
"netflix": [],
"youTubePremium": []
},
"promoted": false,
"certification": "18",
"releaseDate": "2009-09-09",
"runTime": 101,
"userRating": null,
"inUserList": false,
"packShot": {
"thumbnail": "imageurl"
},
"backdrop": {
"thumbnail": "imageurl"
}
}
]

struct Responder: Codable {
let type: String
let id: String
let description: String
let title: String
let promoted: Bool
let certification: String
let firstAirDate: String
let lastAirDate: String
let numberEpisodes: Int
let numberSeasons: Int
let userRating: Int?
let inUserList: Bool
let thumbnail: PackShotObj
let amazonPrime: linksObj
}
struct PackShotObj: Codable {
let packShot: [String]
}
struct linksObj: Codable {
let link: String
let format: String
}
struct genres: Codable {
let empty: String
}

Answer 1

这是工作代码，解码你的json数据。请注意我的结构模型和您的结构模型之间的差异。您需要查阅服务器的文档，以确定哪些字段是可选的，并据此调整代码:

struct ContentView: View {
@State var responders: [Responder] = []

var body: some View {
List(responders) { responder in
Text(responder.title)
Text(responder.description)
Text(responder.releaseDate)
}
.onAppear {
let json = """
[
{
"type": "movie",
"id": "ffff-ddd968-4cf0-a939-8skeu",
"title": "Sorority Row",
"description": "When five laldkdk",
"categories": [],
"genres": [
"Mystery",
"Horror"
],
"links": {
"amazonPrime": [
{
"link": "somelink",
"format": "native_ios"
},
{
"link": "somelink",
"format": "native_ios"
}
],
"appleTvPlus": [],
"disneyPlus": [],
"iTunes": [
{
"link": "www.somelink",
"format": "webview_computer"
}
],
"netflix": [],
"youTubePremium": []
},
"promoted": false,
"certification": "18",
"releaseDate": "2009-09-09",
"runTime": 101,
"userRating": null,
"inUserList": false,
"packShot": {
"thumbnail": "imageurl"
},
"backdrop": {
"thumbnail": "imageurl"
}
}
]
"""
// simulated API data
let data = json.data(using: .utf8)!
do {
self.responders = try JSONDecoder().decode([Responder].self, from: data)
print("n---> responders: n (responders)n")
} catch {
print("n---> decoding error: n (error)n")
}
}
}
}
// MARK: - Responder
struct Responder: Identifiable, Codable {
let type, id, title, description: String
let categories: [String]
let genres: [String]
let links: Links
let promoted: Bool
let certification, releaseDate: String
let runTime: Int
let userRating: Int?
let inUserList: Bool
let packShot, backdrop: Backdrop
}
// MARK: - Backdrop
struct Backdrop: Codable {
let thumbnail: String
}
// MARK: - Links
struct Links: Codable {
let amazonPrime: [Provider]
let appleTvPlus: [Provider]
let disneyPlus: [Provider]
let iTunes: [Provider]
let netflix: [Provider]
let youTubePremium: [Provider]
}
struct Provider: Codable {
let link, format: String
}

Answer 2

只需复制并粘贴此模型到文件中，就可以了。

struct Responder: Codable {
let type, id, title, welcomeDescription: String
let categories: [String]
let genres: [String]
let links: Links
let promoted: Bool
let certification, releaseDate: String
let runTime: Int
let userRating: Any?
let inUserList: Bool
let packShot, backdrop: Backdrop
enum CodingKeys: String, CodingKey {
case type, id, title
case welcomeDescription = "description"
case categories, genres, links, promoted, certification, releaseDate, runTime, userRating, inUserList, packShot, backdrop
}
}
// MARK: - Backdrop
struct Backdrop: Codable {
let thumbnail: String
}
// MARK: - Links
struct Links: Codable {
let amazonPrime: [AmazonPrime]
let appleTvPlus, disneyPlus: [String]
let iTunes: [AmazonPrime]
let netflix, youTubePremium: [String]
}
// MARK: - AmazonPrime
struct AmazonPrime: Codable {
let link, format: String
}