title: #ifdef to check if device is iPhone 5
body: <p>I wrote:</p>
  
  <pre><code>#define IS_IPHONE_5 ([UIScreen mainScreen].bounds.size.height == 568.0)
  
  #ifdef IS_IPHONE_5
  #define SCREEN_HEIGHT 568
  #else
  #define SCREEN_HEIGHT 480
  #endif
  </code></pre>
  
  <p>but it always return that device is iPhone 5... What am I doing wrong?</p>