title: iPhone Chart: How can we zoom in in Core Plot ? (example code: AAPLot)
body: <p>iPhone Chart: How can we zoom in  in Core Plot ? (example code: AAPLot)</p>
  
  <p>I am now using Core Plot to draw a Chart by example Code AAPLot</p>
  
  <pre><code>CPTGraphHostingView *graphHost;
  IBOutlet UIScrollView *_scrollview;
  IBOutlet UIView *zoom_view;    
  APYahooDataPuller *datapuller;
  CPTXYGraph *graph;
  </code></pre>
  
  <p>How to let the View zoom in and zoom out?</p>