Bridge between Kingfisher and UIImageView for easy swapping between 3rd party image download libraries

UIImageView+URL.swift

//
//  UIImageView+URL.swift
//  marcosgriselli
//
//  Created by Marcos Griselli.
//  Copyright © 2017 marcosgriselli. All rights reserved.
//

import Kingfisher

public enum ImageAnimation {
    case flipFromLeft
    case flipFromRight
    case fade
    
    
    /// Kingfisher transition. This keeps all animation code together rather than distributed in the codebase.
    /// Makes it easier to hadle it and modify it in the future
    ///
    /// - Returns: current third party library animator. Currently: ImageTransition
    func convert(withDuration duration: TimeInterval) -> ImageTransition {
        switch self {
        case .flipFromLeft:
            return ImageTransition.flipFromLeft(duration)
        case .flipFromRight:
            return ImageTransition.flipFromRight(duration)
        case .fade:
            return ImageTransition.fade(duration)
        }
    }
}

// MARK: - UIImageView image downloader from URL's

extension UIImageView {
    func setImage(fromURL url: URL) {
        kf.setImage(with: url)
    }
    
    func setImage(fromURL url: URL,
                  withPlaceholderImage placeholder: UIImage?,
                  animation: ImageAnimation? = nil,
                  duration: TimeInterval? = 0,
                  completion: CompletionHandler? = nil) {

        var options: KingfisherOptionsInfo? = nil
        if let animation = animation {
            options?.append(.transition(animation.convert(withDuration: duration ?? 0.2)))
        }
        kf.setImage(with: url,
                    placeholder: placeholder,
                    options: options,
                    progressBlock: nil,
                    completionHandler: completion)
    }
    
    func setImage(fromString string: String?) {
        guard let string = string, let url = URL(string: string) else { return }
        setImage(fromURL: url)
    }
    
    func setImage(fromString string: String?, completion: @escaping CompletionHandler) {
        guard let string = string, let url = URL(string: string) else { return }
        setImage(fromURL: url,
                 withPlaceholderImage: nil,
                 animation: nil, 
                 duration: nil,
                 completion: completion)
    }
    
    func cancelDownload() {
        kf.cancelDownloadTask()
    }
}