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copied!<p>To download the video from YouTube:</p> <ol> <li>Get the URL to download from, via the YouTube API or whatever other method.</li> <li>Create an <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSOutputStream_Class/Reference/Reference.html" rel="noreferrer">NSOutputStream</a> or <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSFileHandle_Class/Reference/Reference.html" rel="noreferrer">NSFileHandle</a> opened on a temporary file (in <code>NSTemporaryDirectory()</code> or a temp-named file in your Documents directory).</li> <li>Set up your progress bar and whatever else you need to do.</li> <li>Allocate and start an NSURLConnection to fetch the file from the URL. Do not use <code>sendSynchronousRequest:returningResponse:error:</code>, of course.</li> <li>In the <code>connection:didReceiveResponse:</code> delegate method, read out the length of data to be downloaded for proper updating of the progress bar.</li> <li>In the <code>connection:didReceiveData:</code> delegate method, write the data to the output stream/file handle and update the progress bar as necessary.</li> <li>In <code>connectionDidFinishLoading:</code> or <code>connection:didFailWithError:</code>, close the output stream/file handle and rename or delete the temporary file as appropriate.</li> </ol> <p>To play it back, just use NSURL's <code>fileURLWithPath:</code> to create a URL pointing to the local file in the Documents directory and play it as you would any remote video.</p>

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