ios - 使用 uicollectionview Swift 更新单个 View

Question

我有一个网格电影的 View 。有三个属性:标题标签、海报电影的 ImageView 和显示电影是否受欢迎的图像。
当单击一个单元格时，进入详细 View ，显示其他有关电影的信息，并且有一个按钮操作来支持电影。我希望更新网格 Collection View 中的按钮图标。因此，我创建了一个委托(delegate)以在此事件发生时进行监听，然后重新加载 Collection View 。
截图:
grid movies screen
detail movie screen

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for: indexPath) as! MoviesCollectionViewCell
    
    cell.titleLabel.text = popularMovies[indexPath.row].title
    
    getImageMovies(imageURLString: popularMovies[indexPath.row].poster, imageView: cell.movieImage)
    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let detailMovieViewController = DetailMovieViewController()
    
    detailMovieViewController.titleMovieLabel.text = popularMovies[indexPath.row].title
    detailMovieViewController.releaseDateMovieLabel.text = popularMovies[indexPath.row].date
    detailMovieViewController.overviewMovieLabel.text = popularMovies[indexPath.row].overview
    
    getImageMovies(imageURLString: popularMovies[indexPath.row].poster, imageView: detailMovieViewController.movieImage)
    
    getGenresMovies(genresMoviesID: popularMovies[indexPath.row].genre, genreMovieLabel: detailMovieViewController.genreMovieLabel)
    
    collectionView.deselectItem(at: indexPath, animated: true)
    
    detailMovieViewController.delegate = self
    selectedIndexPath = indexPath
    
    self.navigationController?.pushViewController(detailMovieViewController, animated: true)
    
    
}


protocol favoriteMovieDelegate: class {
func updateFavoriteImage ()
}

@objc func markFavoriteButtom (buttom: UIButton){
    
    if buttom.isSelected == false {
        buttom.isSelected = true
    }else {
        buttom.isSelected = false
    }
    
    delegate?.updateFavoriteImage()
    
}


func updateFavoriteImage() {
    
    if let indexPath = selectedIndexPath {
        let cell = collectionView.cellForItem(at: indexPath) as! MoviesCollectionViewCell
        
        cell.favoriteIconImage.image = UIImage(named: "favorite_full_icon")
        collectionView.reloadData()
    }
}


struct Films: Codable {
   let id: Int
   let title: String
   let poster: String
   let genre: [Int]
   let date: String
   let overview: String

enum CodingKeys: String, CodingKey {
    case id
    case title
    case poster = "poster_path"
    case genre = "genre_ids"
    case date = "release_date"
    case overview
}

}

Answer 1

而不是直接更新您的cell.favoriteIconImage.image您必须直接更新您的对象，然后重新加载 CollectionView .您需要在 cellForItem 上设置收藏图片此外，您需要将其发布到服务器，一旦用户将其设为 fav ... 并获取 isFav如果要保留数据，请从服务器。如果您的服务器不支持 isFav那么您需要将其存储在本地，以针对 film Id ...在 user default