title: Iphone write code in prefix.pch
body: <p>I want to write code in prefix.pch for chatboost
  currently i have made a file name global where i have mentioned all app ids and  signatures</p>
  
  <p>currently my .pch file looks like this</p>
  
  <pre><code>#import &lt;Availability.h&gt;
  
  
  #ifndef __IPHONE_5_0
  #warning "This project uses features only available in iOS SDK 5.0 and later."
  #endif
  
  #ifdef __OBJC__
      #import &lt;UIKit/UIKit.h&gt;
      #import &lt;Foundation/Foundation.h&gt;
      #import "Global.h"
      #import "Chartboost.h"
  #endif
  </code></pre>
  
  <p>but i have no idea how to write code in prefix.pch</p>
  
  <p>my global.h file looks like this</p>
  
  <pre><code>#import &lt;Foundation/Foundation.h&gt;
  
  @interface Global : NSObject
  #define APP_ID @"dfgdf";
  #define APP_SIGNATURE @"fdgfd";
  @end
  </code></pre>