StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POTracking Asynchronous Connections with Blocks
text
Body
copied!<p>I am doing a lot of URL requests (about 60 small images) and I have started to do them Asynchronously. My code adds another image (little downloading thing) and then sets a Request going.</p> <p>When the request is done I want "data" to be put in the location which was originally added for it, however, I can not see how to pass "imageLocation" to the block for it to store the image in the correct location.</p> <p>I have replaced the 3rd line with below which seems to work but I am not 100% it is correct (it is very hard to tell as the images are nearly identical). I am also thinking that it is possible to pass "imageLocation" at the point where the block is declared.</p> <p>Can any confirm any of this?</p> <blockquote> <p>__block int imageLocation = [allImages count] - 1;</p> </blockquote> <pre><code> // Add another image to MArray [allImages addObject:[UIImage imageNamed:@"downloading.png"]]; imageLocation = [allImages count] - 1; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]]; [request setTimeoutInterval: 10.0]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { if (data != nil && error == nil) { //All Worked [allImages replaceObjectAtIndex:imageLocation withObject:[UIImage imageWithData:data]]; } else { // There was an error, alert the user [allImages replaceObjectAtIndex:imageLocation withObject:[UIImage imageNamed:@"error.png"]]; }]; </code></pre>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload