Using URLSession downloadTask to download some file from URL, by setting timeoutIntervalForResource of the session configuration, and in urlSession(_:task:didCompleteWithError:) delegate trying to get resumeData with NSURLSessionDownloadTaskResumeData key then using downloadTask(withResumeData:) to download with resume data.
The same code works on macOS as expected but does not work on Linux environment.
Code demo:
import Foundation
#if canImport(FoundationNetworking)
import FoundationNetworking
#endif
final class DownloadTool: NSObject {
private lazy var session: URLSession = {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForResource = 5
return URLSession(configuration: configuration, delegate: self, delegateQueue: nil)
}()
private var progress = 0
func start(_ url: URL) {
session.downloadTask(with: url).resume()
}
}
extension DownloadTool: URLSessionDownloadDelegate {
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print("Download succeeded")
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
guard let error = error else { return }
print(error)
guard let resumeData = (error as NSError).userInfo[NSURLSessionDownloadTaskResumeData] as? Data else {
print("Download failed")
return
}
session.downloadTask(withResumeData: resumeData).resume()
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
let currProgress = Int(Double(totalBytesWritten) / Double(totalBytesExpectedToWrite) * 100)
if progress == currProgress { return }
progress = currProgress
print("Downloading in progress: \(progress)%")
}
}