不调用tableView（_：cellForRowAtIndexPath）并且TableView不显示任何数据

Question

I put a Table View Controller and embed in to a Navigation Controller on IB. After that I create a WalletsTableViewController class with the following code:

class WalletsTableViewController: UITableViewController {

    private var wallets = [Wallet]()

    override func viewDidLoad() {
        super.viewDidLoad()
        fetchWallets()
    }

    private func fetchWallets(){
        let managedObjectContext = AppDelegate.managedContext
        let fetchRequest: NSFetchRequest<Wallet> = Wallet.fetchRequest()
        do {
            wallets = try managedObjectContext.fetch(fetchRequest)
        } catch {
            print(error.localizedDescription)
        }
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection: Int) -> Int {
        return wallets.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "WalletCell", for: indexPath) 
        let wallet = wallets[indexPath.row]
        cell.textLabel?.text = wallet.name
        return cell
    }
}

I implement a persistent application that's why I have the fetchWallets() method and it works well. I can print the data to the console but the tableView doesn't want to show my elements. Moreover the implemented tableView() methods are not called. How can I fix this problem?

EDIT: tableView.reloadData() did not help

EDIT2: Here's my storyboard:

Answer 1

As suggested in the comments above try the following:

    private func fetchWallets(){
    let managedObjectContext = AppDelegate.managedContext
    let fetchRequest: NSFetchRequest<Wallet> = Wallet.fetchRequest()
    do {
        wallets = try managedObjectContext.fetch(fetchRequest)
        self.tableView.reloadData()
    } catch {
        print(error.localizedDescription)
    }
}

Answer 2

you need to reload table view in main thread use the below code

   private func fetchWallets(){
        let managedObjectContext = AppDelegate.managedContext
        let fetchRequest: NSFetchRequest<Wallet> = Wallet.fetchRequest()
        do {
            wallets = try managedObjectContext.fetch(fetchRequest)
            DispatchQueue.main.async {
               self.tableView.reloadData()
            }
        } catch {
            print(error.localizedDescription)
        }
    }

Hope this will help you

Answer 3

My bad... I did not delete the autoimplemented functions. This has solved my problem.