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Use sleepUntilDate method of NSThread:

<pre style="background-image: URL(http://2.bp.blogspot.com/_z5ltvMQPaa8/SjJXr_U2YBI/AAAAAAAAAAM/46OqEP32CJ8/s320/codebg.gif); background: #f0f0f0; border: 1px dashed #CCCCCC; color: black; font-family: arial; font-size: 12px; height: auto; line-height: 20px; overflow: auto; padding: 0px; text-align: left; width: 99%;"> NSDate *future = [NSDate dateWithTimeIntervalSinceNow: 2.2 ]; //In seconds
[NSThread sleepUntilDate:future];
</pre>

<div class="p2"><h3>Useful links</h3><div><ul><li>Run code in main thread from other thread</li><li>Make asynchronous method calls</li></ul></div><div>
</div><div>Source</div></div><div class="p2"></div>