How to cache image for temporary use iOS Swift 5

File

import UIKit

class ImageCache {
    static func getImage(urlString: String) -> UIImage? {
        if let dict = UserDefaults.standard.object(forKey: "ImageCache") as? [String:String] {
            if let path = dict[urlString] {
                if let data = try? Data(contentsOf: URL(fileURLWithPath: path)) {
                    let img = UIImage(data: data)
                    return img
                }
            }
        }
        
        return nil
    }
    
    static func storeImage(urlString: String, img: UIImage) {
        let path = NSTemporaryDirectory().appending(UUID().uuidString)
        let url = URL(fileURLWithPath: path)
        
        let data = img.jpegData(compressionQuality: 1.0)
        try? data?.write(to: url)
        
        var dict = UserDefaults.standard.object(forKey: "ImageCache") as? [String:String]
        if dict == nil {
            dict = [String:String]()
        }
        dict![urlString] = path
        UserDefaults.standard.set(dict, forKey: "ImageCache")
    }
}

// Implemantion

// store
func downloadVideoCover(completion : @escaping (UIImage?)->Void) {
    AVAsset(url: URL(string: url)!).generateThumbnail { (image) in
        DispatchQueue.main.async {
            guard let image = image else { return }
            ImageCache.storeImage(urlString: self.url, img: image)
            completion(image)
            return
        }
    }
}

// show
if let image = ImageCache.getImage(urlString: url) {
  imageView.image = image
}