TableView multiple cell doesnt work, Terminated due to signal 9 - ios

Question

I wanted to make when tabbaritem click call api and fill tableView. But in my case i had to use multiple cell.
up category (tab bar item) -> category (1- cell) -> products (2- cell)
up category (tab bar item)-> products (2- cell)
i have two prototype cell in tableView. First cell for show category. Second cell for show products.
When category click, i reloaded tableview then i can show products.
But when i showed products just only 1 time. My tableview unavaliable. I am sure i call reload data.
Message from debugger: Terminated due to signal 9
Here's my code,
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
if let orderType = selectedOrderType
{
switch orderType
{
case OrderViewHelper.OrderType.Category:
return self.categories.count;
case OrderViewHelper.OrderType.Menu:
return self.menus.count;
case OrderViewHelper.OrderType.Product:
return self.products.count;
}
}
return 0;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
var returnerCell = UITableViewCell();
switch selectedOrderType!
{
case OrderViewHelper.OrderType.Category:
let cell = tableView.dequeueReusableCell(withIdentifier: ViewCellStatics.TABLE_ORDER_VIEW_CELL, for: indexPath) as! CategoryTableViewCell;
cell.lblCategoryId.text = self.categories[indexPath.row].Id;
cell.lblCategoryName.text = self.categories[indexPath.row].Name;
cell.lblCategoryId.isHidden = true;
returnerCell = cell;
break;
case OrderViewHelper.OrderType.Menu:
let cell = tableView.dequeueReusableCell(withIdentifier: ViewCellStatics.TABLE_PRODUCT_VIEW_CELL, for: indexPath) as! ProductsTableViewCell;
cell.lblPrice.text = self.menus[indexPath.row].Price;
cell.lblProductName.text = self.menus[indexPath.row].Name;
cell.lblId.text = self.menus[indexPath.row].Id;
cell.lblId.isHidden = true;
cell.lblProductName.numberOfLines = 2;
returnerCell = cell;
break;
case OrderViewHelper.OrderType.Product:
let cell = tableView.dequeueReusableCell(withIdentifier: ViewCellStatics.TABLE_PRODUCT_VIEW_CELL, for: indexPath) as! ProductsTableViewCell;
cell.lblPrice.text = self.products[indexPath.row].Price;
cell.lblProductName.text = self.products[indexPath.row].Name;
cell.lblId.text = self.products[indexPath.row].Id;
cell.lblId.isHidden = true;
cell.lblProductName.numberOfLines = 2;
cell.addButton.Model = self.products[indexPath.row];
cell.addButton.addTarget(self, action: #selector(addBasket(_:)), for: .touchUpInside);
break;
}
return returnerCell;
}
private func getCategories(upperCategoryId : String)
{
var paramaters = [WebServiceParamater]();
paramaters.append(WebServiceParamater(key: WebServiceVariableKeys.UPPER_CATEGORY, value: upperCategoryId));
WebService().GetData(action: ActionNames.CATEGORIES, paramater: paramaters)
{
(objects) in
if (objects == nil || objects?.count == 0) { return; }
self.ClearModels(type: OrderViewHelper.OrderType.Category);
DispatchQueue.main.sync
{
self.categories = JsonParser.ParseCategories(jsonArray: objects);
self.tableOrders.reloadData();
}
}
}
private func getProducts(category : CategoryModel)
{
var paramaters = [WebServiceParamater]();
paramaters.append(WebServiceParamater(key: WebServiceVariableKeys.CATEGORY, value: category.Id));
WebService().GetData(action: ActionNames.PRODUCT, paramater: paramaters)
{
(objects) in
if (objects == nil || objects?.count == 0) { return; }
self.ClearModels(type: OrderViewHelper.OrderType.Product);
DispatchQueue.main.sync
{
self.products = JsonParser.ParseProduct(jsonArray: objects);
self.tableOrders.reloadData();
}
}
}
Screenshots
Category
I clicked one category so i can see products
Reload data doesnt work.

Answer 1

Never call DispatchQueue.main.sync, try to DispatchQueue.main.async instead.
BTW: Make sure your methods in WebService calling asynchronously in background threads so you won't block UI while loading something.
Hope this answer will help you in understandings https://stackoverflow.com/a/44324968/4304998