title: Adding a lot of data to core data while keeping the UI responsive
body: <p>I'm looking for a way to add a whole load of data to core data while keeping the little activity indicator spinning on the UI. I tried adding the data on another thread but since learned that core data is not thread safe, and I get all kinds of errors. Can anyone suggest another approach to this?</p>
  
  <p>Thanks in advance.</p>