title: Why does UIFont systemFontOfSize:weight not crash on iOS 8.0?
body: <p>I'm having a strange issue with conflicting compilers, due to <code>UIFont</code> <code>systemFontOfSize:weight</code> which is supposedly only available from iOS 8.2. </p>
  
  <p>Locally, I can compile a project that uses the function onto an iPhone 6 running iOS 8.0 and it runs perfectly fine. I can also compile to the 8.1 Simulator with correct results, including weighting.</p>
  
  <p>The issue is that we are using Team City and the line will not compile on the server using the iOS 8.0 SDK. I know the solution is to remove the line, but I'd like to find out why it's not catching the error during a local compile... Was the function available before iOS 8.2 but just as a private API?</p>