sisoje

class URLImageTableViewCell: UITableViewCell {
    @IBOutlet weak var urlImageView: UIImageView!    
    
    var urlImageLoader: DeinitBlock?

    // new task is created, old task cancelled automatically
    func setImage(url: URL) {
        urlImageLoader = urlImageView.setCachedImage(url: url)
    }
}

sisoje

extension URLSessionDataTask {
    var cancellation: DeinitBlock {
        return DeinitBlock { [weak self] in
            self?.cancel()
        }
    }
}

sisoje

class DeinitBlock {
    let onDeinit: () -> Void
    init(_ block: @escaping () -> Void) {
        onDeinit = block
    }
    deinit {
        onDeinit()
    }
}