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  1. PO
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    <p>If you're downloading any data over a network connection, I would suggest using <a href="http://allseeing-i.com/ASIHTTPRequest/" rel="nofollow">ASIHttpRequest</a>. This will allow you to download files asynchronously, meaning your interface doesn't freeze during the download process.</p> <p>If you use <code>ASIHttpRequest</code>, you can also set the <code>didFinishSelector</code>. By doing this, you can control which method is called when a specific URL has finished loading.</p> <p>Have a look at this:</p> <pre><code>NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com"]; ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; [request setDelegate:self]; [request startAsynchronous]; [request setDidFinishSelector:@selector(requestDone:)]; </code></pre> <p>Then:</p> <pre><code>- (void)requestDone:(ASIHTTPRequest *)request { // Use when fetching text data NSString *responseString = [request responseString]; // Use when fetching binary data NSData *responseData = [request responseData]; // If you want, you can get the url of the request like this NSURL *url = [request url]; } </code></pre> <p>As for the second part of your question, if the <code>requestDone:</code> method has not been called, you know the download has not completed.</p> <p>If you want to do something more complicated with multiple downloads, <code>ASIHttpRequest</code> offers queue functionality too. Take a look <a href="http://allseeing-i.com/ASIHTTPRequest/How-to-use" rel="nofollow">here</a>.</p>
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    1. PONSURLConnection delegate
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    1. USLiam George Betsworth
    1. USLiam George Betsworth
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      1. VTUpMod
    1. CO`NSURLConnection` also operates asynchronously by default. That's why there are delegate methods; they are the callbacks to get the results of the connection.
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      1. USJosh Caswell
    2. COI have zero exp. with ASIHttpRequest... does it handle https?
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      1. USsangony
    3. COYes, it does. Just use https for the URL, no issues at all.
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      1. USBill Burgess
 

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