I am a beginner in iOS development. I was trying to use an api URl: https://www.arbeitnow.com/api/job-board-api in my job search iOS app. But nothing shows on my app. I tested the URL in POSTMAN and it returns json(but HTML in description part?). I wrote the code:
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"
}
}
I used the code in HomeViewController:
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
I don’t know what is wrong with my code. Can anyone help? Thanks!
2
Answers
You are discarding all meaningful error information, which will make this hard to diagnose. If you get an
Error
object, you should return that:So, that will,
URLSession
error, tell you what the error was;Without something like this, that captures the salient error information, you are flying blind.
In this case, the error is that you are parsing for
[Results]
, but the structure is a dictionary, whose key isdata
and whose value is a[Results]
. You are missing an object for this dictionary that wraps the[Results]
.Your model does not match the JSON you receive from the link you provided:
Using:
should solve the problem
Usage:
Edit to adress the comment:
This should work!
is your code isn´t it?
instead use:
how could data be missing here?
After that you should either map the root object to your
Result
type to keep your Viewmodel and completion Handler the way they are now. Or change Viewmodel and completion Handler instead.