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copied!<p><a href="https://stackoverflow.com/questions/2536441/iphone-progressive-download-audio-player" title="This">This</a> questions discusses what you're looking for</p> <p>Edit:</p> <p>If you want to download a file THEN play it, what you need to do is:</p> <p>use an NSURLConnection to download the file to the disk - <a href="https://stackoverflow.com/questions/623735/how-to-download-a-large-file-with-the-iphone-sdk-and-avoid-memory-usage-issues" title="this">this</a> link discusses saving large files (i wouldn't keep 2-5mb's in the memory when i don't need them even thought it will probably work).</p> <p>, than an AVAudioPlayer to play it - check <a href="http://mobileorchard.com/easy-audio-playback-with-avaudioplayer/" rel="nofollow noreferrer" title="this">this</a> out.</p> <p>Edit 2:</p> <p>For the cancel button, it should practically just call the [NSURLConnection cancel] method and do whatever other finishing up your download class is gonna need...</p> <p>For the progress bar, in the NSURLConnectionDelegate method didReceiveResponse, you take the NSURLResponse, cast it to a NSHTTPURLResponse, and retrieve the size of the file you're downloading using the <a href="http://developer.apple.com/library/ios/documentation/cocoa/reference/foundation/Classes/NSURLResponse_Class/Reference/Reference.html#//apple_ref/occ/instm/NSURLResponse/expectedContentLength" rel="nofollow noreferrer" title="expectedContentLength">expectedContentLength</a> method.</p> <p>And then in each call to the NSURLConnection:didRecieveData method you count the incoming bytes using [data length] method, divide it by the <a href="http://developer.apple.com/library/ios/documentation/cocoa/reference/foundation/Classes/NSURLResponse_Class/Reference/Reference.html#//apple_ref/occ/instm/NSURLResponse/expectedContentLength" rel="nofollow noreferrer" title="expectedContentLength">expectedContentLength</a> from the previous URL response and that's the float the represents your progress that you pass to the progress view's <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/UIProgressView_Class/Reference/Reference.html#//apple_ref/occ/instp/UIProgressView/progress" rel="nofollow noreferrer">progress</a> property</p>

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