Instance Method

downloadTaskWithRequest:

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.

Declaration

- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request;

Parameters

request

A URL request object that provides the URL, cache policy, request type, body data or body stream, and so on.

Return Value

The new session download task.

Discussion

By creating a task based on a request object, you can tune various aspects of the task’s behavior, including the cache policy and timeout interval.

After you create the task, you must start it by calling its resume method. The task calls methods on the session’s delegate to provide you with progress notifications, the location of the resulting temporary file, and so on.

See Also

Adding Download Tasks to a Session

- downloadTaskWithURL:

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

- downloadTaskWithURL:completionHandler:

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

- downloadTaskWithRequest:completionHandler:

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.

- downloadTaskWithResumeData:

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

- downloadTaskWithResumeData:completionHandler:

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

NSURLSessionDownloadTask

A URL session task that stores downloaded data to file.

NSURLSessionDownloadDelegate

A protocol that defines methods that URL session instances call on their delegates to handle task-level events specific to download tasks.