What is difference between NSURLSessionDataTask vs NSURLSessionDownloadTask

ios objective-c nsurlsession nsurlsessiondownloadtask nsurlsessiontask
Toseef Khilji picture Toseef Khilji · Dec 16, 2013 · Viewed 10.2k times · Source

In latest apple introduce new NSURLSession in replace of NSURLConnection, so in there are different task , so what is the difference between NSURLSessionDataTask, NSURLSessionDownloadTask ?

and in which scenario use NSURLSessionTask and where NSURLSessionDownloadTask?

Answer

Toseef Khilji picture Toseef Khilji · Dec 16, 2013

NSURLSessionDataTask : Data tasks exchange data using NSData. NSURLSessionDataTask is not supported in Background Sessions.

Data tasks send and receive data using NSData objects. Data tasks are intended for short, often interactive requests from your app to a server. Data tasks can return data to your app one piece at a time after each piece of data is received, or all at once through a completion handler. Because data tasks do not store the data to a file, they are not supported in background sessions.

NSURLSessionDownloadTask : NSURLSessionDownloadTask directly writes the response data to a temporary file. It supports background downloads when the app is not running.

Download tasks retrieve data in the form of a file, and support background downloads while the app is not running.

I guess below image give you better knowledge:

enter image description here

Related questions

How do I make an HTTP request in Swift?

I read The Programming Language Swift by Apple in iBooks, but cannot figure out how to make an HTTP request (something like cURL) in Swift. Do I need to import Obj-C classes or do I just need to import default …

Read More
Send POST request using NSURLSession

Update: Solution found. You can read it at the end of the post. I'm trying to perform a POST request to a remote REST API using NSURLSession. The idea is to make a request with two parameters: deviceId and textContent. …

Read More
NSURLSession: How to increase time out for URL requests?

I am using iOS 7's new NSURLSessionDataTask to retrieve data as follows: NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionDataTask *dataTask = [session dataTaskWithRequest: request completionHandler: ^(NSData *data, NSURLResponse *response, NSError *error) { // }]; How can I increase the time out values to avoid the error "…

Read More