使用Kingfisher加载图片后，处理图片尺寸

使用KF加载网络图片后，经常会因为不同的图片处理需要做适配处理

解决方法：

let newUrl = url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
self.bgImage.kf.setImage(with: URL(string: newUrl)) { result in
    switch result {
    case .success(let value):
        let size = value.image.size
        let scale = Float(size.height / size.width)
        print("--\(size), ---\(scale)")
        print("Task done for: \(value.source.url?.absoluteString ?? "")")
    case .failure(let error):
        print("Job failed: \(error.localizedDescription)")
    }
}