DownloadModelSpec.swift

final class Download {

    weak var delegate: DownloadDelegate?
    
    // Other properties 
    
    var progress: Float = 0.0 {
        didSet {
            updateProgress()
        }
    }
    
    // Gives float for download progress - for delegate
    
    private func updateProgress() {
        delegate?.downloadProgressUpdated(for: progress)
    }
    
    // Initialization
}