title: how to save .zip file in iphone app
body: <p>in my app when user press Download button, then .zip file will be downloaded and should be save on device.</p>
  
  <ol>
  <li>how to store streaming data into .zip file? and </li>
  <li>where to store this .zip file so user can unzip file and see the data of file?</li>
  </ol>
  
  <p>I am using NSURLConncetion to download .zip file   </p>
  
  <p>thank you in advance</p>