JSON data not passing to tableView Cell - json

Question

I am trying to get the below code to pass JSON data to the table viewCell. I have confirmed that the JSON data is being captured and stored in the variable downloadLenderRates. But I cannot get the values to pass to the tabelView Cell. I confirmed that the cell identifier is named correctly and the swift file that helps manage the tableView cell is named correctly. At this point, I get no error messages and just a blank table when I run the app. I am not sure why!
class MortgageRatesVC: UIViewController, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
let mortgousURL = URL(string:"http://mortgous.com/JSON/currentRatesJSON.php")!
var lenderRates = [LenderRate]()
override func viewDidLoad() {
super.viewDidLoad()
downloadJason()
}
func downloadJason () {
lenderRates = []
// guard let downloadURL = url else { return }
URLSession.shared.dataTask(with: mortgousURL) { data, urlResponse, error in
guard let data = data else { return }
do {
let dateFormat = DateFormatter()
dateFormat.locale = Locale(identifier: "en_US_POSIX")
dateFormat.dateFormat = "yyyy-MM-dd"
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .formatted(dateFormat)
let downloadLenderRates = try decoder.decode([LenderRate].self, from: data)
// print(downloadLenderRates)
self.lenderRates = downloadLenderRates
DispatchQueue.main.async {
self.tableView.reloadData()
}
} catch {
print(error)
}
}.resume()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return lenderRates.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "LenderCell") as? LenderCell else { return UITableViewCell() }
cell.lenderNamelbl.text = lenderRates[indexPath.row].financialInstitution
print(lenderRates[indexPath.row].financialInstitution)
return cell
}
}

Answer 1

The syntax
guard let cell = tableView.dequeueReusableCell(withIdentifier: "LenderCell") as? LenderCell else {
return UITableViewCell()
}
is very bad habit.
The guard can only fail if there is a design error which occurs for example if the developer forgot to set the class of the cell to the custom class. In this case you won't see anything in the table view.
This is one of the few cases where force-unwrapping is recommended. If the design is set up properly the cell is valid and its type is the custom class. Further use always the API dequeueReusableCell(withIdentifier:for:) which returns a non-optional cell.
let cell = tableView.dequeueReusableCell(withIdentifier: "LenderCell", for: indexPath) as! LenderCell