swift json help in displaying data on table view controller - json

Question

// my url
// https://fetch-hiring.s3.amazonaws.com/hiring.json
/*
my json
[
{"id": 383, "listId": 4, "name": ""},
{"id": 472, "listId": 1, "name": ""},
{"id": 625, "listId": 2, "name": null}
]
*/
// my main vc class for table view controller
import UIKit
class HeadlLinesTableViewController: UITableViewController {
var parse = [HiringElement]()
override func viewDidLoad() {
// Do any additional setup after loading the view.
super.viewDidLoad()
// Do any additional setup after loading the view.
let urlString = "https://fetch-hiring.s3.amazonaws.com/hiring.json"
guard let url = URL(string: urlString) else { return }
// 2
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!.localizedDescription)
}
guard let data = data else { return }
// 3
//Decode data
self.Elements = try? JSONDecoder().decode(HiringElement.self, from: data)
print(data)
// 4
//Get back to the main queue
DispatchQueue.main.async {
self.tableView.reloadData()
}
// 5
}.resume() // fires of request
}
My model struct for my api this is something I used from quickTypeIo api generator
struct HiringElement: Codable {
let id, listID: Int
let name: String?
enum CodingKeys: String, CodingKey {
case id
case listID
case name
}
} typealias Hiring = [HiringElement]
And my table view controller method here I can't display data on and some some errors. I am using tableview controller so doesn't need tableview delegate or datasource
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
guard let articles = Elements else { return 0 }
return return parse.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
as? newsTableViewCell else {
fatalError(" cell not found ") }
// here I have errors thanks
cell.titleLabel.text = parse[indexPath.row].name
print(cell.titleLabel.text)
return cell
}
}
Here is my table view cell class
import UIKit
class newsTableViewCell: UITableViewCell {
//var article:Article!
#IBOutlet weak var avator: UIImageView!
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var newsLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}

Answer 1

I think you should work on the decoding part. Here is a solution:
struct HiringElement: Decodable {
let id, listId: Int
let name: String?
}
#propertyWrapper
struct IgnoreFailure<Value: Decodable>: Decodable {
var wrappedValue: [Value] = []
private struct _None: Decodable {}
init(from decoder: Decoder) throws {
var container = try decoder.unkeyedContainer()
while !container.isAtEnd {
if let decoded = try? container.decode(Value.self) {
wrappedValue.append(decoded)
}
else {
try? container.decode(_None.self)
}
}
}
}
Then write the following code in your HeadlLinesTableViewController.swift.
typealias ArrayIgnoringFailure<Value: Decodable> = IgnoreFailure<Value>
Then try decoding as:
guard let objects = try? JSONDecoder().decode(ArrayIgnoringFailure<HiringElement>.self, from: data) else { return }
self.elements = objects.wrappedValue
Hope it will solve your problems.