How to implemenmt locking / unlocking feature in iPhone App?
<p>HI,
   I am creating an App in which countdown will be running. I want to lock the iPhone when user taps on the button to start the countdown. Can anyone of you tell me how to do it. Any sample App or code will be very helpful. </p>

<p>here is the image which will make clear what I am asking for.
<img src="http://i.stack.imgur.com/3CqSV.png" alt="enter image description here"></p>

<p>When I will slide the "lock" from left to right user will be ale to further interact with the App<br>
Thanks in Advance!</p>
