title: Xcode 7 - 'xxx' is only available on iOS 8.0 or newer
body: <p>My project need to support iOS 7 and above. So I wrote different code for iOS 7 and above, everything works fine. However, I just upgraded Xcode from 6.4 to 7.0, Xcode alert me 'xxx' is only available on iOS, even through the code won't execute on iOS 8 because I checked the iOS version before execute.</p>
  
  <p>Is there any way to use Xcode 7 and support iOS 7 and above?</p>
  
  <p><a href="https://i.stack.imgur.com/mPZBQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mPZBQ.png" alt="enter image description here"></a></p>