title: What is "UserInterfaceState.xcuserstate" file in Xcode project?
body: <p>I use svnX.</p>
  
  <p>When importing project, I check "no ignore" option. (for importing libOAuth.a, ...)</p>
  
  <p>But one file is causing a small problem.</p>
  
  <blockquote>
    <p>UserInterfaceState.xcuserstate</p>
  </blockquote>
  
  <p>What is this file?</p>
  
  <p>Can I ignore this file? Is it important? Should I commit this file?</p>