title: touchesBegan not responding
body: <p>-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
      {
          NSLog(@" touches ");
      }</p>
  
  <p>The above method is not calling in my apps. My application description is as under.</p>
  
  <p>I have a <code>MainViewController</code> which loads a <code>ContentViewController</code> in it. <code>ContentViewController</code> has a webview which loads a pdf file.</p>
  
  <p>How to listen the tap of <code>MainViewController's</code> View.</p>
  
  <p>Regards.</p>