Error passing data to tableViewController - ios

Question

I have a problem. I'm making an app that consumes an API from themoviedb and saves the movies in the Realm. On the main screen I am using the CollectionViewController, and when I touch the movie it will go to details. However when it goes to details nothing appears and when I select another film it brings the previous film.
Home:
import UIKit
import RealmSwift
class HomeViewController: UIViewController,UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UISearchBarDelegate {
#IBOutlet weak var searchbar: UISearchBar!
#IBOutlet weak var ListOfMovies: UICollectionView!
var movies : Results<Moviess>!
let realm = try! Realm()
var detailsMovies = Moviess()
override func viewDidLoad() {
super.viewDidLoad()
print(Realm.Configuration.defaultConfiguration.fileURL!)
ListOfMovies.delegate = self
ListOfMovies.dataSource = self
searchbar.delegate = self
movies = realm.objects(Moviess.self)
getRequest()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
func getObjects(filter: String) -> Results<Moviess>{
movies = realm.objects(Moviess.self).filter("title CONTAINS[cd] %#",filter)
return movies
}
func getRequest(){
print(movies.count)
if movies.count < 1 {
RequestData.requisicao { (result) in
switch(result){
case .success(let detalhe):
self.ListOfMovies.reloadData()
print(detalhe)
case .failure(let error):
print(error)
}
}
}}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return movies.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "listOfMovies", for: indexPath) as! HomeCollectionViewCell
let infos = movies[indexPath.item]
cell.configurationMovie(movie: infos)
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
detailsMovies = movies[indexPath.row]
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return UIDevice.current.userInterfaceIdiom == .phone ? CGSize(width: collectionView.bounds.width/2-20, height: 200) : CGSize(width: collectionView.bounds.width/3-20, height: 250)
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
print(searchText)
if !searchText.isEmpty{
let filtro = getObjects(filter: searchText)
print(filtro)
ListOfMovies.reloadData()
}else{
movies = realm.objects(Moviess.self)
ListOfMovies.reloadData()
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "details")
{
let viewController = segue.destination as! DetailViewController
print(detailsMovies)
viewController.conta = detailsMovies
}
}
}
Details:
import UIKit
import RealmSwift
class DetailViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
var conta: Moviess!
let realm = try! Realm()
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
tableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return [conta].count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "details", for: indexPath) as! DetailsTableViewCell
let infos = [conta][indexPath.item]
cell.prepare(movie: infos!)
return cell
}
}
Moviess
import RealmSwift
import UIKit
class Moviess: Object{
#objc dynamic var id = 0
#objc dynamic var title = ""
#objc dynamic var overview = ""
#objc dynamic var poster = ""
#objc dynamic var isFavorites = false
override class func primaryKey() -> String? {
return "id"
}
convenience init (id: Int){
self.init()
self.id = id
}
override class func indexedProperties() -> [String] {
return ["isFavorites"]
}
func insertMovieData(list: Moviess){
do {
let realm = try! Realm()
try! realm.write({ () -> Void in
realm.add(list)
})
} catch let error as NSError{
print("insert error : \(error)")
}
}
func togleFavorite(){
try? realm?.write{
isFavorites = !isFavorites
}
}
}
I have no idea where I might be giving this "bug". If someone can help and explain what is going on it will be very useful.

Answer 1

Your problem is that prepare(for:sender:) is called before collectionView(_:, didSelectItemAt:). prepare(for:sender:) should not rely on collectionView(_:, didSelectItemAt:).
Your prepare(for:sender:) method should look like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let cell = sender as? UICollectionViewCell,
let indexPath = ListOfMovies.indexPath(for: cell) else { return }
if (segue.identifier == "details") {
let viewController = segue.destination as! DetailViewController
viewController.conta = movies[indexPath.item]
}
}