如何与协议共享重用的UIImageView？

protocol UIImageViewDelegate: class {
    func setImageWithURL(url: URL, completion: @escaping (UIImage?) -> Void)
}

class ReusableImageView: UIImageView {
    weak var delegate: UIImageViewDelegate?
    
    func loadImage(withURL url: URL) {
        delegate?.setImageWithURL(url: url) { [weak self] image in
            self?.image = image
        }
    }
}

// 在使用时设置代理并加载图片
let imageView = ReusableImageView()
imageView.delegate = MyImageLoader()
imageView.loadImage(withURL: imageURL)

class ReusableImageView: UIImageView {
    var imageLoader: ((URL, @escaping (UIImage?) -> Void) -> Void)?
    
    func loadImage(withURL url: URL) {
        imageLoader?(url) { [weak self] image in
            self?.image = image
        }
    }
}

// 在使用时设置闭包并加载图片
let imageView = ReusableImageView()
imageView.imageLoader = { url, completion in
    // 使用自定义的图片加载逻辑
    // ...
    completion(image)
}
imageView.loadImage(withURL: imageURL)