title: How to detect device's iOS-version's build number, (e.g. 13A452)
body: <p>Is there a way to programmatically detect iOS version's build number, 
  For example iOS version 9.0.2(13A452).
  I know how to detect iOS version eg: 9.0.2.</p>
  
  <p>Is there any API to detect 13A452?</p>
  
  <p>Thanks in advance.</p>