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I've been able to solve the issue of caching images to improve scroll performance in my app. However nil is found when it tries to add it to cache. Also how can I add a placeholder image for images that failed to load or aren't available ? https://github.com/lexypaul13/Image-Search extension UIImageView { func downloadImage(from imgURL: String) -> URLSessionDataTask? { guard let url = URL(string: imgURL) else { return nil } // set initial image to nil so it doesn't use the image from a reused cell image = nil // check if the image is already in the cache if let imageToCache = imageCache.object(forKey: imgURL as NSString) { self.image = imageToCache return nil } // download the image asynchronously let task = URLSession.shared.dataTask(with: url) { (data, response, error) in if let err = error { print(err) return } DispatchQueue.main.async { // create UIImage let imageToCache = UIImage(data: data!) // add image to cache imageCache.setObject(imageToCache!, forKey: imgURL as NSString) self.image = imageToCache } } task.resume() return task } }

The search bar in the weekly view controller in my app isn't working. It fails to show the corresponding cell from the text in the search bar. Project: link:https://github.com/lexypaul13/Trending-Tv-Shows isSearching = False     func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {         var activeArray: Show         if isSearching {             activeArray = shows[indexPath.row]         } else {             activeArray = filteredShows[indexPath.row]         }         let detailsVC = Details_ViewController(showID:show_ID)         detailsVC.showID = activeArray.id ?? 0                  let navController   = UINavigationController(rootViewController: detailsVC)         present(navController, animated: true)     }  func updateUI(_ shows:[Show]){         if self.shows.isEmpty{             let alert = UIAlertController(title: "Tv Show Doesnt Exist", message: nil,preferredStyle: UIAlertController.Style.alert)             alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))             self.present(alert, animated: true, completion: nil)         }         self.updateData(shows: self.shows)              }          func updateData(shows:[Show]){ //shows follwers         var snapshot = NSDiffableDataSourceSnapshot<Section,Show>()         snapshot.appendSections([.main])         snapshot.appendItems(shows)         DispatchQueue.main.async {             self.dataSource.apply(snapshot,animatingDifferences: true)         }     }    func updateSearchResults(for searchController: UISearchController) {         if searchController.searchBar.text != ""{             filteredShows = shows.filter({$0.unwrappedName.lowercased().contains((searchController.searchBar.text ?? "").lowercased())})             updateData(shows: filteredShows)         }         else {             updateData(shows: shows)         }              }               func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {         isSearching = false         updateData(shows: filteredShows)     }     

My app connects to a web service to display JSON data in a table view. Right now, its memory usage is terrible and needs improvement; while performing a memory leak check on instrument, it shows issues related to "WKWebsiteDataStore." What does this mean, and how do I resolve it? The code below shows a web view from a selected table view cell. Project link https://github.com/lexypaul13/Covid-News import UIKit import WebKit class ArticleViewController: UIViewController { 	 	@IBOutlet weak var articlePage: WKWebView! 	var website: ArticlesData? 	 	override func viewDidLoad() { 		super.viewDidLoad() 		 		if let url = URL(string: website?.urlWebsite ?? "" ) { 			let request = URLRequest(url: url) 			articlePage.load(request) 			// Do any additional setup after loading the view. 		} 	} 	 }

How can I sort by date, the parsed json in this function ?  func parseData(data: Data) -> [ArticlesData]? { do {             let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary                          let jsonArticles = jsonResult?["articles"] as? [AnyObject] ?? [] // gets first head of json file and converts it to dictionary                          for jsonArticle in jsonArticles { // captures data and stores it in the model object                 let article = ArticlesData()                                  article.author = jsonArticle["author"] as? String                 article.myDescription = jsonArticle["description"] as? String                 article.publishedAt = jsonArticle["publishedAt"] as? String                 article.urlImage = jsonArticle["urlToImage"] as? String                 article.urlWebsite = jsonArticle["url"] as? String                 articles?.append(article) //put article data in the array             }             let nc = NotificationCenter.default             nc.post(name: Notification.Name("didFinishParsing"), object: nil)         } catch {             print("\(error)")                      }         return articles ?? []     }     

I am trying to save JSON data received from a web service into my core data model. This works by swiping left from a table view cell to save. When I try to look at the saved data from a database, nothing shows. Can someone please have a look? The code below handles persistence. https://github.com/lexypaul13/Covid-News Error Message: [] nwprotocolgetquicimageblockinvoke dlopen libquic failed func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {         let save =  UIContextualAction(style: .normal, title: "Save") { (action, view, completionHandler) in             completionHandler(true)                 CoreDataManger.sharedInstance.createData()     }         save.backgroundColor = .systemBlue         let swipe =  UISwipeActionsConfiguration(actions: [save])         return swipe     } _ class CoreDataManger: NSObject {     static let sharedInstance = CoreDataManger()     private override init() {}     var newsCoreData: [News] = []     var article = ArticlesData()     // MARK: - Core Data Saving support     func createData(){         //As we know that container is set up in the AppDelegates so we need to refer that container.         DispatchQueue.main.async(execute: { [self] in         guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }         //We need to create a context from this container         let managedContext = appDelegate.persistentContainer.viewContext         //Now let’s create an entity and new user records.         let newsEntity = NSEntityDescription.entity(forEntityName: "News", in: managedContext)!   for article in self.newsCoreData{         let news = NSManagedObject(entity: newsEntity, insertInto: managedContext) news.setValue("\(article.author ?? "")", forKeyPath: "author")   news.setValue("\(article.myDescription ?? "")", forKeyPath: "myDescription") news.setValue("\(article.publishedAt ?? "")", forKeyPath: "publishAt")          news.setValue("\(article.title ?? "")", forKeyPath: "title")          news.setValue("\(article.urlImage ?? "")", forKeyPath: "urlImage")          news.setValue("\(article.urlWebsite ?? "")", forKeyPath: "urlWebsite")         }        //Now we have set all the values. The next step is to save them inside the Core Data         do {             try managedContext.save()         } catch let error as NSError {             print("Could not save. \(error), \(error.userInfo)")         }         print(FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))     }         )} }

I want to implement a search bar in my app, However I can't access the methods to manipulate strings such filter, lowercase, contain etc. Can anyone provide a suggestion on how can I solve this issue ? I am a beginner. Here's my model class Articles: NSObject{     var author: String?     var title: String?     var publishedAt: String?     var urlImage: String?     var urlWebsite : String? } class LatestNewsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { let newsData = Articles() //Model object let urlRequest = "https://newsapi.org/v2/everything?q=coronavirus&apiKey=" //Website API var urlSelected = "" var articles: [Articles]? = [] // holds array of Articles data var indexOfPageToRequest = 1 @IBOutlet weak var tableview: UITableView! func parseData(data:Data)-> [Articles] { var articles: [Articles]? = [] // holds parsed data do { let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary let jsonArticles = jsonResult?["articles"] as? [AnyObject] ?? [] // gets first head of json file and converts it to dictionary for jsonArticle in jsonArticles{ // captures data and stores it in the model object let article = Articles() article.author = jsonArticle["author"] as? String article.title = jsonArticle["description"] as? String article.publishedAt = jsonArticle["publishedAt"] as? String article.urlImage = jsonArticle["urlToImage"] as? String article.urlWebsite = jsonArticle["url"] as? String articles?.append(article) //put article data in the array } print(jsonArticles) DispatchQueue.main.async { if(articles!.count > 0) { self.tableview.reloadData() } } } catch { print("Nothing my guy\(error)") } return articles ?? [] // returns an array of articles } func tableView( tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return articles?.count ?? 0 } func tableView( tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! NewsTableViewCell cell.authorName.text = articles?[indexPath.row].author cell.headLine.text = articles?[indexPath.row].title cell.newsImage.downloadImage(from:(self.articles?[indexPath.item].urlImage ?? "nill")) cell.timePublication.text = articles?[indexPath.row].publishedAt return cell } func searchBar(_ searchBar: UISearchBar,textDidChange searchText: String){ filteredData = [] }

How do I show more table cells from the newsapi.org ; right now it only shows 19. How do I increase the number to show more when the user scrolls down ? Please look at the LatestNewsView Controller  https://github.com/lexypaul13/Covid-News