Cancel NSURLConnection started with sendAsynchronousRequest:queue:completionHandler:?
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M

1

12
  1. Is it possible to cancel an NSURLConnection started with sendAsynchronousRequest:queue:completionHandler:?

  2. Why doesn't sendAsynchronousRequest:queue:completionHandler: return the NSURLConnection object it creates so that I can cancel it?

Mert answered 28/5, 2012 at 20:58 Comment(0)
H
5

EDIT - Since my provided answer seems to have been wrong, you should check out the following related question and its answers:

How can I cancel an asynchronous call through NSURLConnection sendAsynchronousRequest?

Old answer:

In your header of your class (e.g. ViewController), declare an operation queue:

NSOperationQueue *downloadOperationQueue;

To download a file call something like the following:

downloadOperationQueue = [[NSOperationQueue alloc] init];
NSURLRequest *fileRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com/images/nav_logo114.png"]
                                             cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                         timeoutInterval:10];
[NSURLConnection sendAsynchronousRequest:fileRequest
                                   queue:downloadOperationQueue
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                           NSLog(@"download successful");
                       }];

To cancel the download later on call:

[downloadOperationQueue cancelAllOperations];
Hix answered 11/9, 2012 at 13:54 Comment(4)
According to the doc: "...queue: The operation queue to which the handler block is dispatched when the request completes or failed". ie: the queue paramater is the queue that handles the completion block, not the queue that takes care of the request itselfValle
WTF? it will not cancel the request :DBristol
Yes. That's why I edited the answer and provided a link to another answer.Hix
Yes, the old answer just set isCancelled to Yes and you need to manually check and behave accordingly :/Lava

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