我是iOS開發的初學者。我試圖在我的求職 iOS 應用程式中使用 api URl： https ://www.arbeitnow.com/api/job-board-api。但是我的應用程式上沒有顯示任何內容。我在 POSTMAN 中測驗了 URL，它回傳 json（但描述部分中的 HTML？）。我寫了代碼：
func getResults(completed: @escaping (Result<[Results], ErrorMessage>) -> Void) {
let urlString = "https://www.arbeitnow.com/api/job-board-api"
guard let url = URL(string: urlString) else {return}
let task = URLSession.shared.dataTask(with: url) { data, response, error in
if let _ = error {
completed(.failure(.invalidData))
return
}
guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
completed(.failure(.invalidResponse))
return
}
guard let data = data else {
completed(.failure(.invalidData))
return
}
do {
let deconder = JSONDecoder()
deconder.keyDecodingStrategy = .convertFromSnakeCase
let results = try deconder.decode([Results].self, from: data)
completed(.success(results))
} catch {
completed(.failure(.invalidData))
}
}
task.resume()
}
struct Results: Codable {
let slug, companyName, title, resultsDescription: String
let remote: Bool
let url: String
let tags, jobTypes: [String]
let location: String
let createdAt: Int
enum CodingKeys: String, CodingKey {
case slug
case companyName = "company_name"
case title
case resultsDescription = "description"
case remote, url, tags
case jobTypes = "job_types"
case location
case createdAt = "created_at"
}
}
我在 HomeViewController 中使用了代碼：
override func viewDidLoad() {
super.viewDidLoad()
title = "Home"
collectionView.backgroundColor = UIColor(named: "backgroundMain")
collectionView.register(SearchViewCell.self, forCellWithReuseIdentifier: cellId)
setupSearchBar()
Service.shared.getResults() { [weak self] result in
switch result {
case .success(let results):
print(results)
self?.jobResults = results
DispatchQueue.main.async {
self?.collectionView.reloadData()
}
case .failure(let error):
print(error)
}
}
}
888
我不知道我的代碼有什么問題。任何人都可以幫忙嗎？謝謝！
uj5u.com熱心網友回復：
您正在丟棄所有有意義的錯誤資訊，這將使其難以診斷。如果你得到一個Error物件，你應該回傳：
enum WebServiceError: Error {
case httpError(Data, Int)
}
func getResults(completion: @escaping (Result<[Results], Error>) -> Void) {
let urlString = "https://www.arbeitnow.com/api/job-board-api"
guard let url = URL(string: urlString) else {
completion(.failure(URLError(.badURL)))
return
}
let task = URLSession.shared.dataTask(with: url) { data, response, error in
guard
let data = data,
let response = response as? HTTPURLResponse,
error == nil
else {
completion(.failure(error ?? URLError(.badServerResponse)))
return
}
guard 200 ..< 300 ~= response.statusCode else {
completion(.failure(WebServiceError.httpError(data, response.statusCode)))
return
}
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let results = try decoder.decode([Results].self, from: data)
completion(.success(results.data))
} catch {
completion(.failure(error))
}
}
task.resume()
}
所以，這將，
- 如果有
URLSession錯誤，告訴你錯誤是什么； - 如果有非 2xx 狀態代碼，請告訴您代碼是什么（并回傳回應的正文，以防您想查看）；和
- 如果有決議錯誤，告訴你決議錯誤是什么。
如果沒有這樣的東西來捕捉顯著的錯誤資訊，你就瞎了眼。
在這種情況下，錯誤是您正在決議 for [Results]，但結構是一個字典，其鍵為data，其值為 a [Results]。您缺少包含[Results].
struct ResponseObject: Decodable {
let data: [Posting]
let links: Links
let meta: Meta
}
struct Posting: Decodable {
let slug, companyName, title, description: String
let remote: Bool
let url: String
let tags, jobTypes: [String]
let location: String
let createdAt: Int
}
struct Links: Decodable {
let first: URL?
let last: URL?
let prev: URL?
let next: URL?
}
struct Meta: Decodable {
let currentPage: Int
let path: URL
let perPage: Int
let from: Int
let to: Int
let terms: String
let info: String
}
func getResults(completion: @escaping (Result<[Posting], Error>) -> Void) {
let urlString = "https://www.arbeitnow.com/api/job-board-api"
guard let url = URL(string: urlString) else {
completion(.failure(URLError(.badURL)))
return
}
let task = URLSession.shared.dataTask(with: url) { data, response, error in
guard
let data = data,
let response = response as? HTTPURLResponse,
error == nil
else {
completion(.failure(error ?? URLError(.badServerResponse)))
return
}
guard 200 ..< 300 ~= response.statusCode else {
completion(.failure(WebServiceError.httpError(data, response.statusCode)))
return
}
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let results = try decoder.decode(ResponseObject.self, from: data)
completion(.success(results.data))
} catch {
completion(.failure(error))
}
}
task.resume()
}
uj5u.com熱心網友回復：
您的模型與您從提供的鏈接收到的 JSON 不匹配：
使用：
struct Root: Codable{
let data: [WorkData]
let links: Links
let meta: Meta
}
// MARK: - Links
struct Links: Codable {
let first: String
let last, prev: String?
let next: String
}
// MARK: - Meta
struct Meta: Codable {
let currentPage, from: Int
let path: String
let perPage, to: Int
let terms, info: String
enum CodingKeys: String, CodingKey {
case currentPage = "current_page"
case from, path
case perPage = "per_page"
case to, terms, info
}
}
struct WorkData: Codable {
let slug, companyName, title, payloadDescription: String
let remote: Bool
let url: String
let tags, jobTypes: [String]
let location: String
let createdAt: Int
enum CodingKeys: String, CodingKey {
case slug
case companyName = "company_name"
case title
case payloadDescription = "description"
case remote, url, tags
case jobTypes = "job_types"
case location
case createdAt = "created_at"
}
}
應該解決問題
用法：
let root = JsonDecoder().decode(Root.self, from: data)
let firstCompany = root.data[0]
編輯以解決評論：這應該有效！
let results = try decoder.decode([Results].self, from: data)
你的代碼不是嗎？
改為使用：
let root = JsonDecoder().decode(Root.self, from: data)
這里怎么會丟失資料？
之后，您應該將根物件映射到您的Result型別，以使您的 Viewmodel 和完成處理程式保持現在的狀態。或者改為更改 Viewmodel 和完成處理程式。
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