swift – How can I get my iOS app related with api?

I’m a newbie in iOS growth. I used to be making an attempt to make use of an api URl: https://www.arbeitnow.com/api/job-board-api in my job search iOS app. However nothing exhibits on my app. I examined the URL in POSTMAN and it returns json(however HTML in description half?). I wrote the code:

func getResults(accomplished: @escaping (Outcome<[Results], ErrorMessage>) -> Void) {
        
        let urlString = "https://www.arbeitnow.com/api/job-board-api"
        guard let url = URL(string: urlString) else {return}
        
        let activity = URLSession.shared.dataTask(with: url) { (knowledge, response, error) in
            
            if let _ = error {
                accomplished(.failure(.invalidData))
                return
            }
            
            guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
                accomplished(.failure(.invalidResponse))
                return
            }
            
            guard let knowledge = knowledge else {
                accomplished(.failure(.invalidData))
                return
            }
            
            do {
                let deconder = JSONDecoder()
                deconder.keyDecodingStrategy = .convertFromSnakeCase
                let outcomes = attempt deconder.decode([Results].self, from: knowledge)
                accomplished(.success(outcomes))
                
                
            } catch {
                accomplished(.failure(.invalidData))
            }
            
            
        }
        activity.resume()
    }

I used the code in HomeViewController:

override func viewDidLoad() {
        tremendous.viewDidLoad()
        title = "Dwelling"
        collectionView.backgroundColor = UIColor(named: "backgroundMain")
        collectionView.register(SearchViewCell.self, forCellWithReuseIdentifier: cellId)
        setupSearchBar()
        
        Service.shared.getResults() {[weak self] lead to
            swap consequence {
            case .success(let outcomes):
                print(outcomes)
                self?.jobResults = outcomes
                
                DispatchQueue.essential.async {
                    self?.collectionView.reloadData()
                }
                
                
            case .failure(let error):
                print(error)
            }
        }
    }

I do not know what’s unsuitable with my code. Can anybody assist? Thanks!