title: iOS 6 APIs and backwards compatibility
body: <p>Can I use APIs and Frameworks introduced in iOS 6 in an app that supports earlier iOS versions?</p>
  
  <p>Is this only possible through workarounds and code such as:</p>
  
  <pre><code>[[UIDevice currentDevice] systemVersion]
  </code></pre>
  
  <p>Or would I be able to use updated frameworks, APIs, etc. in an app that supports earlier versions of iOS without specifying the version?</p>
  
  <p>And also, would I be able to use Xcode 4.5, or would I have to stick to the current public release?</p>