import Kingfisher
//旧版本
ImageDownloader.default.downloadImage(with: urlStr.url!, retrieveImageTask: nil, options: nil, progressBlock: nil) { (image, error, url, _) in
weakself?.bankBtn.setImage(image, for: .normal)
}
swift5.0
KingfisherManager.shared.retrieveImage(with: urlStr.url!) { result in
let image = try? result.get().image
if let image = image {
}
}