title: Which book teaches the inner workings of how Xcode builds apps from code?
body: <p>I do iOS development and I'd like to have a deeper understanding of what is happening under the hood with Xcode. </p>
  
  <p>Things like byte code, virtual machines, object files, bundles, executables, etc. And ideally, I'd like to know how all of these ideas tie into Xcode.</p>
  
  <p>Which book should I get in order to learn this? </p>