title: Xcode 6.1 swift autocomplete and code sense broken
body: <p>I am using <code>Xcode Version 6.1 (6A1052d)</code>, it is working well except the only problem is auto complete and code sense is broken for <code>swift</code> projects.</p>
  
  <p>I can fix it by deleting derived data and the folder <code>~/Library/Caches/com.apple.dt.Xcode</code>, which is described <a href="https://stackoverflow.com/a/26596341/4016786">here</a>, or changing the <code>deployment target</code> of the project from <code>8.1</code> to <code>8.0</code>.</p>
  
  <p>However, the first solution only last me for 1 or 2 days, out of no where it doesn't work again, I don't want to delete the folders every so often or change the target iOS versions all the time. Please help me.</p>