title: Can I make an Xcode project read only, ie prevent it from modifying files?
body: <p>I'm working on an iOS project that I edit in Emacs but debug in Xcode. I occasionally edit the source files in Xcode accidentally, so I'd like to prevent that. I can't make the files themselves read only, since I need to edit them. Is there any way to make the Xcode editor treat them as read only and prevent me from editing them?</p>
  
  <p>I do occasionally use Xcode to edit the <em>project</em>, e.g. adding and removing files. It's just Xcode's <em>file editor</em> that i want to prevent from editing files. So, I'd need something that applies to the file editor only, or that can be easily toggled on and off.</p>