TableView not updating after button action - ios

Question

I'm relatively new to swift, and I'm trying to have a view that when it loads it will display some info on my tableView, then in the same view I have a textfield and a button
I want that the button performes an action that fetchs data from my server and updates my tableView
The problem is that the table is not being updated. How can I get the table to be updated?
CODE:
override func viewDidLoad() {
super.viewDidLoad()
tableView.rowHeight = 80;
tableView.tableFooterView = UIView();
self.url = URL(string: "http://xxxxxxxx.com/xxxxx/api/produtos/listagem/favoritos/\(userID)");
downloadJson(_url: url!);
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return produtos.count;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProdutoCell1") as? ProdutoCell else{
return UITableViewCell()
}
cell.lbl_nome_json.text = produtos[indexPath.row].nome;
cell.lbl_categoria_json.text = produtos[indexPath.row].categoria;
cell.lbl_loja_json.text = produtos[indexPath.row].loja
//= produtos[indexPath.row].categoria;
// cell.lbl_loja.text = produtos[indexPath.row].loja;
if let imageURL = URL(string: "http://xxxxxxxxxx.com/myslim/api/"+produtos[indexPath.row].url){
DispatchQueue.global().async {
let data = try? Data(contentsOf: imageURL);
if let data = data{
let image = UIImage(data: data);
DispatchQueue.main.async {
cell.imgView_json.image = image;
}
}
}
}
return cell;
}
ACTION:
#IBAction func btn_search(_ sender: Any) {
if self.txt_search.text == "" {
let alert = UIAlertController(title:"Alert",message: "Insira algo para pesquisar",preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertAction.Style.default, handler: nil))
self.present(alert,animated: true,completion: nil)
}else{
var pesquisa = String();
pesquisa = self.txt_search.text!;
let url2 = URL(string: "http://xxxxxxxx.com/xxxxxx/api/produtos/listagem/favoritos/\(pesquisa)/\(self.userID)");
downloadJson(_url: url2!);
}
func downloadJson(_url: URL){
guard let downloadURL = url else {return}
URLSession.shared.dataTask(with: downloadURL){data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else{
print("algo está mal");
return;
}
do{
let decoder = JSONDecoder();
let downloadedProdutos = try decoder.decode([ProdutoModel].self, from: data);
self.produtos = downloadedProdutos
print(downloadedProdutos);
DispatchQueue.main.async {
self.tableView.reloadData();
print("reload");
}
}catch{
print("algo mal depois do download")
}
}.resume();
}
EDIT
I added some print to see how many object were being returned on my downloadedProdutos variable, on the downloadJson() function.
And at the viewdidload I get 2 object, its normal because I only have 2 Products, but when the action is done I still get 2 object although I should get only 1 object

Answer 1

You need to set tableView.dataSource = self in viewWillAppear and it looks you missed func numberOfSections() -> Int method.
Add UITableViewDataSource like this
class YourViewController: UIViewController, UITableViewDataSource and it will recommend you required methods