如何手动解码 swift 中的 json 数据 4

Question

如何手动按键解码[相册]和[图片]？我试过了，但我做不到。不知错误是什么？谢谢！我的 Json http://appscorporation.ga/api-user/test

struct ProfileElement: Codable {
    let user: User

    let postImage: String
    let postLikes: Int
    let postTags: String

    enum CodingKeys: String, CodingKey {
        case user

        case postImage = "post_image"
        case postLikes = "post_likes"
        case postTags = "post_tags"
    }
}

struct User: Codable {
    let name, surname: String
    let profilePic: String
    let albums: [Album]

    enum CodingKeys: String, CodingKey {
        case name, surname
        case profilePic = "profile_pic"
        case albums
    }
}

第二块

struct Album {
    let id: Int
    let title: String
    var images: [Image]
    enum AlbumKeys: String, CodingKey {
        case id = "id"
        case title = "title"
        case images = "images"
    }
}
struct Image: Codable {
    let id: Int
    let url: String

    enum CCodingKeys: String, CodingKey {
        case id = "id"
        case url = "url"
    }
}

Answer 1

你收到错误

Type 'User' does not conform to protocol 'Decodable'

因为所有的struct都要采用(De)codable,

如果您稍作改动，这些结构就会起作用

struct ProfileElement: Decodable {
    let user: User

    let postImage: String
    let postLikes: Int
    let postTags: String
}

struct User: Decodable {
    let name, surname: String
    let profilePic: String
    let albums: [Album]
}

struct Album : Decodable {
    let id: Int
    let title: String
    var images: [Image]

}
struct Image: Decodable {
    let id: Int
    let url: String
}

然后解码

let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase // This line gets rid of all CodingKeys
let result = try decoder.decode([ProfileElement].self, from: data)

你可以用

得到每张图片

for item in result {
    for album in item.user.albums {
        for image in album.images {
            print(image)
        }
    }
}

如何手动解码 swift 中的 json 数据 4

How to manually decode json data in swift 4

xcode

parsing

json

swift

codable