UIImageView+ImageDescriptor.swift

extension UIImageView {
    func apply(_ imageDescriptor: ImageDescriptor<UIImage>) {
        cancelAnyExistingFetches()
        
        accessibilityIdentifier = imageDescriptor.properties.accessibilityIdentifier
        backgroundColor = imageDescriptor.properties.backgroundColor
        contentMode = imageDescriptor.properties.contentMode
        tintColor = imageDescriptor.properties.tintColor
        image = imageDescriptor.imageReference
    }

    func apply(
        _ imageDescriptor: ImageDescriptor<URL>,
        loading loadingImageDescriptor: ImageDescriptor<UIImage>? = nil,
        failure failureImageDescriptor: ImageDescriptor<UIImage>? = nil
    ) {
        cancelAnyExistingFetches()

        if let loadingImageDescriptor = loadingImageDescriptor {
            apply(loadingImageDescriptor)
        }

        let imageURL = imageDescriptor.imageReference
        fetchImage(with: imageURL) { [weak self] result in
            guard let _self = self else {
                return
            }

            switch result {
            case .success(let image):
                let downloadedImageDescriptor = ImageDescriptor<UIImage>(
                    imageReference: image,
                    properties: imageDescriptor.properties
                )
                _self.apply(downloadedImageDescriptor)
            case .failure:
                if let failureImageDescriptor = failureImageDescriptor {
                    _self.apply(failureImageDescriptor)
                }
            }
        }
    }
}