Problems updating Uicollectionview

Question

I’m having trouble giving reloadData() in Uicollectionview when using the UISearchBar. Debugging to see if the object coming from REALM was nil I realized that the function to filter is coming with the correct values. Put when giving reloadData() in Collection nothing happens....

Class of the Uicollectionview

 class HomeViewController: UIViewController,UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UISearchBarDelegate {

//MARK: - IBOutlet
@IBOutlet weak var searchbar: UISearchBar!

@IBOutlet weak var ListOfMovies: UICollectionView!

//MARK: - Variables
var movies : Results<Moviess>!

var indexPath: IndexPath!
let realm = try! Realm()

override func viewDidLoad() {
    super.viewDidLoad()
    ListOfMovies.delegate = self
    ListOfMovies.dataSource = self
    searchbar.delegate = self
    getRequest()

}

override func viewWillAppear(_ animated: Bool) {
    getObjects()
}
func getObjects() -> Results<Moviess>{
    movies = realm.objects(Moviess.self)
    return movies
}

func getRequest(){
    if getObjects().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 {
    print( getObjects().count,"<---  Items")
    return getObjects().count
  }

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "listOfMovies", for: indexPath) as! HomeCollectionViewCell

    let infos = getObjects()[indexPath.item]
    cell.configurationMovie(movie: infos)
    return cell
  }
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let infos = getObjects()[indexPath.item]
    infos.togleFavorite()
    ListOfMovies.reloadData()
    print(infos.title)
}


  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{

        movies = getObjects().filter("title CONTAINS[cd] %@", searchText)
        print(movies.count, "<----- item FIltred")
        self.ListOfMovies.reloadData()
    }
}

}

When I type something in Archbar I see this

20 <---  Items
 A
10 <----- item FIltred. <-- Aqui é onde ele filtra o resultados
20 <---  Items <--- Apos o reloadData() da collection ele volta com os itens iniciais 

Object class REALM

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
    }
  }
}

Where can I be wrong? Thank you!

Answer 1

Within the function numberOfItemsInSection you are calling getObjects(), she is "resetting" the values of movies for all the objects you have in the Realm:

func getObjects() -> Results<Moviess>{
    movies = realm.objects(Moviess.self)
    return movies
}

And your table is filled with this variable. When you call the reloadData(), one of the functions performed from the datasource of the tableView is the numberOfItemsInSection:

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    print( getObjects().count,"<---  Items")
    return getObjects().count
  }

Basically you are filtering the data, and when you are going to update the table, you are doing fetch of all the data again.