PersistentDataStore+Image.swift

extension PersistentDataStore {
    func loadImage(forIdentifier identifier: Identifier, completionHandler block: @escaping (UIImage?) -> (Void)) {
        loadData(forIdentifier: identifier, dataTransformer: { UIImage(data: $0) }, completionHandler: block)
    }

    func storeImage(_ image: UIImage, identifier: String = UUID().uuidString, completionHandler handler: @escaping (Result) -> ()) {
        storeData({ image.jpegData(compressionQuality: 1.0) }, identifier: identifier, completionHandler: handler)
    }
}

// Examples:
persistentStore.storeImage(image) { (result) in
    print(result)
}

persistentStore.loadImage(forIdentifier: "my_identifier") { (image) -> (Void) in
    guard let image = image else {
        print("Failed loading image.")
        return
    }
    print(image)
}