Swift.DecodingError.Context

Question

我正在按照以下方式从URL响应中解码JSON（解码器）字符串，并在解码过程中获得以下错误消息：

错误：

typeMismatch（Swift.String，Swift.DecodingError.Context（codingPath：[_JSONKey（stringValue：“ Index 0”，intValue：0），CodingKeys（stringValue：“ tags”，intValue：nil），_JSONKey（stringValue：“ Index” 0“，intValue：0）]，debugDescription：“预期对String进行解码，但找到了一个数字。”，底层错误：nil））]

结构：

struct Wordpress: Codable {
    let id: Int?
    let date: String?
    let date_gmt: String?
    let guid: GUID?
    let modified: String?
    let modified_gmt: String?
    let slug: String?
    let status: String?
    let type: String?
    let link: String?
    let title: Title?
    let content: Content?
    let excerpt: Excerpt?
    let author: Int?
    let featured_media: Int?
    let comment_status: String?
    let ping_status: String?
    let sticky: Bool?
    let template: String?
    let format: String?
    let meta: [String]?
    let categories: [Int]?
    let tags: [String]?
    let _links: Link?

    enum CodingKeys: String, CodingKey {
        case id = "id"
        case date = "date"
        case date_gmt = "date_gmt"
        case guid = "guid"
        case modified = "modified"
        case modified_gmt = "modified_gmt"
        case slug = "slug"
        case status = "status"
        case type = "type"
        case link = "link"
        case title = "title"
        case content = "content"
        case excerpt = "excerpt"
        case author = "author"
        case featured_media = "featured_media"
        case comment_status = "comment_status"
        case ping_status = "ping_status"
        case sticky = "sticky"
        case template = "template"
        case format = "format"
        case meta = "meta"
        case categories = "categories"
        case tags = "tags"
        case _links = "_links"
    }
}

struct GUID: Codable{
    let rendered: String?
}

struct Title: Codable{
    let rendered: String?
}

struct Content: Codable{
    let rendered: String?
    let protected: Bool?
}

struct Excerpt: Codable{
    let rendered: String?
    let protected: Bool?
}

struct Link: Codable {
    let urls: [URLString]?
    let collection: [Collection]?
    let about: [About]?
    let author: [Author]?
    let replies: [Replies]?
    let versionHistory: [Version]?
    let predecessorVersion: [Predecessor]?
    let wpFeaturedmedia: [Featured]?
    let wpAttachment: [Attachment]?
    let wpTerm: [Term]?
    let curies: [Curies]?

    enum CodingKeys: String, CodingKey {
        case urls = "urls"
        case collection = "collection"
        case about = "about"
        case author = "author"
        case replies = "replies"
        case versionHistory = "version-history"
        case predecessorVersion = "predecessor-version"
        case wpFeaturedmedia = "wp:featuredmedia"
        case wpAttachment = "wp:attachment"
        case wpTerm = "wp:term"
        case curies = "curies"
    }
}

struct About: Codable{
    let href : String?
}

struct Author: Codable {
    let embeddable: Bool?
    let href : String?
}

struct Replies: Codable {
    let embeddable: Bool?
    let href : String?
}

struct Version: Codable {
    let count: Int?
    let href : String?
}

struct Predecessor: Codable {
    let id: Int?
    let href : String?
}
struct Featured: Codable {
    let embeddable: Bool?
    let href : String?
}

struct Attachment: Codable{
    let href : String?
}

struct Term: Codable {
    let taxonomy: String?
    let embeddable: Bool?
    let href: String?
}

struct Curies: Codable {
    let name: String?
    let href: String?
    let templated: Bool?
}

我的解码代码：

class func path_getPosts(per_page:Int) -> URL {
        let s = APIwp.base + APIwp.posts + APIwp.per_page + "\(per_page)"
        print(s)
            return URL(string: s)!

        }


    static func getPosts(for per_page: Int, completion: @escaping ([Wordpress], Error?) -> Void) {
        taskGetPosts(url: path_getPosts(per_page: per_page), responseType: [Wordpress].self) { (response, error) in
                if let response = response {
                    completion(response, nil)
                } else {
                    completion([], error)
                }
            }
        }

    @discardableResult static func taskGetPosts<ResponseType: Decodable>(url: URL, responseType: ResponseType.Type, completion: @escaping (ResponseType?, Error?) -> Void) -> URLSessionDataTask {
        let task = URLSession.shared.dataTask(with: url) { (data, response, error)
            in
            guard let data = data else {
                DispatchQueue.main.async {
                    completion(nil, error)
                }
            return
            }

            let decoder = JSONDecoder()
            do {
                let responseObject = try decoder.decode(ResponseType.self, from: data)
                DispatchQueue.main.async { completion(responseObject, nil) }
            } catch let jsonErr {
                print("Error:=: \(jsonErr)")
                DispatchQueue.main.async { completion(nil, error) }
            }
        }
        task.resume()
        return task
    }

Answer 1

请仔细阅读错误消息。

它告诉您根对象第一项中的键_JSONKey(stringValue: "Index 0", intValue: 0)（tags

的数组中的第一项（

CodingKeys(stringValue: "tags", intValue: nil)）（_JSONKey(stringValue: "Index 0", intValue: 0)不是字符串，而是数字（[Expected to decode String but found a number instead）。所以tags可能是[Int]