title: iPhone: How to code a reducing countdown timer?
body: <p>I want to show a countdown timer using a <code>UILabel</code> which will start from 5 and <strong>reduces by 1 every second</strong> like:</p>
  
  <p>5
  4
  3
  2
  1</p>
  
  <p>and finally hides the label when it reaches 0.</p>
  
  <p>I tried to code it using <code>NSTimer scheduledTimerWithTimeInterval</code> but failed miserably.</p>
  
  <p>Please help me.</p>