Streaming large files with URLSession and background transfers in Swift allows developers to efficiently manage downloads without blocking the main thread. By leveraging the capabilities of URLSession, we can ensure a smooth user experience even when dealing with hefty data. This method is particularly useful for applications that need to handle large assets, such as videos or high-resolution images, seamlessly.
// Configuring URLSession for background downloads
let config = URLSessionConfiguration.background(withIdentifier: "com.example.app.background")
let session = URLSession(configuration: config, delegate: self, delegateQueue: nil)
// Starting a file download
func downloadFile(from url: URL) {
let downloadTask = session.downloadTask(with: url)
downloadTask.resume()
}
// Handling the download completion
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
// Move downloaded file to permanent location
let destinationURL = getDocumentsDirectory().appendingPathComponent("file.ext")
try? FileManager.default.moveItem(at: location, to: destinationURL)
}
// Helper method to get documents directory
func getDocumentsDirectory() -> URL {
return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
}
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