I am making a news app, with the use of News API, where it shows the top news of the day at the app's main screen. I created a UITableView to store the photos and the titles of the articles but neither of them are appearing correctly.

The code bellow is how I fetch the data and store the properties of the cells in an array called topNewsArray, containing the cells properties inside structs named CellArticle. If there is no image to store, it will display a newspaper icon provided by SF Symbols.

func getTopNews() {
        
        currentLocation = Locale.current.regionCode?.lowercased() ?? "us"
        let urlString: String = "https://newsapi.org/v2/top-headlines?country=\(currentLocation)&apiKey=\(apiKey)"
        let url = URL(string: urlString)
        
        // Check if url is available.
        guard url != nil else {
            return
        }
        
        // Create URLSession to download and upload data.
        let session = URLSession.shared
        
        // Create a task that retrieves the contents of the specified URL.
        let dataTask = session.dataTask(with: url!) { data, response, error in
            
            // Check for errors.
            if error == nil && data != nil {
                
                // Parse JSON.
                let decoder = JSONDecoder()
                
                do {
                    
                    let topNewsFeed = try decoder.decode(NewsFeed.self, from: data!)
                    let topNewsCount: Int = (topNewsFeed.articles?.count)!
                    
                    // Add news to the topNewsArray.
                    for i in 0..<topNewsCount {
                        
                        let cellTitle = topNewsFeed.articles?[i].title
                        
                        if topNewsFeed.articles?[i].urlToImage != nil {
                            let cellImage = topNewsFeed.articles?[i].urlToImage
                            self.topNewsArray.append(CellArticle(title: cellTitle, imageName: cellImage))
                        }
                        else {
                            self.topNewsArray.append(CellArticle(title: cellTitle, imageName: "newspaper"))
                        }
                        print("News Title: ", cellTitle!, "\n")
                        
                    }
                }
                
                catch {
                    print("Error in JSON Parsing.")
                }
            }
        }
        
        // Make the API Call.
        dataTask.resume()
        
    }

The message from the print("News Title: ", cellTitle!, "\n") does work, showing all the top news of the day.

So I think the problem is at the tableView function, where I typed the following code to populate it with the cells containing the data from their respective CellArticlefrom the topNewsArray:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let currentArticle = topNewsArray[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomTableViewCell
        
        cell.label.text = currentArticle.title
        
        if currentArticle.imageName == "newspaper" {
            cell.iconImageView.image = UIImage(systemName: "newspaper")
        }
        else {
            let urlToImage = URL(string: currentArticle.imageName!)
            let dataImage = try? Data(contentsOf: urlToImage!)
            cell.iconImageView.image = UIImage(data: dataImage!)
        }
        
        
        return cell
    }

The result I expected is something like this at the Main storyboard:

But I am getting an empty table, like this:

CodePudding user response：

Solved it, just needed to put this code after the for loop

DispatchQueue.main.async {
    self.table.reloadData()
}

CodePudding user response：

You just have to add this in your for loop:

self.tableView.reloadData()

where tableView will be the name of your table view.