关于在tableView中显示上次保存的CoreData数据，我遇到了一些问题

Question

我将来自MovieDetailViewController的数据保存在coreData中。我试图从另一个控制器访问coreData数据。当我将数据保存到coreData并切换到另一个控制器，在那里我在tableView中输出结果时，它不会在那里显示新保存的名称。当我删除后台并重新打开它时，它会向我显示上次保存的数据。

我需要一些类似于tableView方法tableView.reloadData()的东西。

class MovieDetailViewController: UIViewController {
var coreDataMovieName: [NSManagedObject] = []
var movie: Movie!
var detailsImageView: UIImage!
var movieName = ""

override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = movie.title
//Detalebshi Photos gamochena
if let posterPath = movie.posterPath {
TMDBClient.downloadPosterImage(path: posterPath) { (data, error) in
guard let data = data else {
return
}
let image = UIImage(data: data)
self.imageView.image = image
self.detailsImageView = image
}
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Favorite")
do {
coreDataMovieName = try managedContext.fetch(fetchRequest)
} catch let error as NSError {
print("Could not fetch. (error), (error.userInfo)")
}
}

func save(name: String) {
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let entity = NSEntityDescription.entity(forEntityName: "Favorite", in: managedContext)!
let person = NSManagedObject(entity: entity, insertInto: managedContext)
person.setValue(name, forKeyPath: "movieName")
do {
try managedContext.save()
coreDataMovieName.append(person)
print("saved (person)")
} catch let error as NSError {
print("Could not save. (error), (error.userInfo)")
}
}
@IBAction func coreDataFavoritesBtnTapped(_ sender: Any) {
save(name: movieName)
}
}

我尝试访问核心数据的控制器：

class CoreDataFavoritesViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!

var movie: [NSManagedObject] = []
override func viewDidLoad() {
super.viewDidLoad()
title = "The List"
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
tableView.dataSource = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Favorite")
do {
movie = try managedContext.fetch(fetchRequest)
} catch let error as NSError {
print("Could not fetch. (error), (error.userInfo)")
}
}
}
// MARK: - UITableViewDataSource
extension CoreDataFavoritesViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

return movie.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let person = movie[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = person.value(forKeyPath: "movieName") as? String
return cell
}
}

Answer 1

您在上下文保存后追加数据

coreDataMovieName.append(person)

在之前做

try managedContext.save()