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PONSURLConnection doesn't receive data when creating many downloading objects in iOS5
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copied!<p>I have been searching for this problem on the SOF for several days and I still have not found the solution (say the same problem) yet.</p> <p>I'm making and app that downloads 5 images simultaneously in an URL list (each image is on a different server).</p> <p>I have an <code>ImageDownloader</code> class subclasses <code>NSOperation</code> and implements the <code>NSURLConnectionDataDelegate</code>.</p> <p>So that I can add an instance of <code>ImageDownloader</code> to an <code>operationQueue</code> in the <code>ViewController</code> and it will run in a separate thread under the <code>operationQueue</code>. The line that add the downloader to the <code>operationQueue</code> is here:</p> <pre><code>downloader = [[ImageDownloader alloc] init]; [downloader downloadImageWithURL:[controller.URList objectForKey:[NSString stringWithFormat:@"%d",downloadIndex]] queue:queue andTag:downloadIndex + 100]; //my custom initialize downloader.delegate = self; [queue addOperation:downloader]; //use the addOperation method </code></pre> <p>Everything works fine in <strong>iOS6</strong> but messed up in <strong>iOS5</strong> (5.0 on my test device and 5.1 on my SDK), it just doesn't receive any response nor data by performing the methods <code>didReceiveResponse</code> and <code>didReceiveData</code> at all (these 2 methods are not jumped in). </p> <p>After the timeout was exceeded, the runloop jumps into <code>didFailWithError</code> method and the program stalls. </p> <p>As I understand, this means the runloop still runs right?</p> <p>I tried to print out the <code>error</code> and all I got is: <code>The request timed out</code>.</p> <p>When I reduce the number of downloading instances to 2 then it runs, but not with >=3 downloading instances.</p> <p>One more information is that my network connection does limit the number of connection. But it work fine in iOS6, why it just doesn't work on iOS5? </p> <p>I can still load the web in the simulator while the app is downloading.</p> <p>So what kind of problem is this and how can I get over this problem? </p> <p>Thanks in advance.</p> <p>*<strong><em>Update:</em>*</strong> as there are many classes and the problem's not been clearly detected yet, I will share here the whole project. You can download it directly from here: <a href="https://dl.dropboxusercontent.com/u/15628608/Public%20files/DownloadImageByOperation.zip" rel="nofollow">DownloadingImage</a></p>

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