Protocol

URLSessionDownloadDelegate

A protocol defining methods that URLSession instances call on their delegates to handle task-level events specific to download tasks.

Declaration

protocol URLSessionDownloadDelegate

Overview

In addition to the methods in this protocol, be sure to implement the methods in the URLSessionTaskDelegate and URLSessionDelegate protocols to handle events common to all task types and session-level events, respectively.

Topics

Handling Download Life Cycle Changes

func urlSession(URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo: URL)

Tells the delegate that a download task has finished downloading.

Required.

Resuming Paused Downloads

Relationships

See Also

Adding Download Tasks to a Session

func downloadTask(with: URL) -> URLSessionDownloadTask

Creates a download task that retrieves the contents of the specified URL and saves the results to a file.

func downloadTask(with: URL, completionHandler: (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask

Creates a download task that retrieves the contents of the specified URL, saves the results to a file, and calls a handler upon completion.

func downloadTask(with: URLRequest) -> URLSessionDownloadTask

Creates a download task that retrieves the contents of a URL based on the specified URL request object and saves the results to a file.

func downloadTask(with: URLRequest, completionHandler: (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask

Creates a download task that retrieves the contents of a URL based on the specified URL request object, saves the results to a file, and calls a handler upon completion.

func downloadTask(withResumeData: Data) -> URLSessionDownloadTask

Creates a download task to resume a previously canceled or failed download.

func downloadTask(withResumeData: Data, completionHandler: (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask

Creates a download task to resume a previously canceled or failed download and calls a handler upon completion.

class URLSessionDownloadTask

A URL session task that stores downloaded data to file.