Is it possible to cancel an
NSURLConnection
started withsendAsynchronousRequest:queue:completionHandler:
?Why doesn't
sendAsynchronousRequest:queue:completionHandler:
return theNSURLConnection
object it creates so that I can cancel it?
Cancel NSURLConnection started with sendAsynchronousRequest:queue:completionHandler:?
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];
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 itself –
Valle
WTF? it will not cancel the request :D –
Bristol
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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