title: Communicating and persisting data between apps with App Groups
body: <p>iOS 8 revealed a new API yesterday concerning App Groups. It was kind of messy before to share data and communicate between apps and I believe that's precisely what App Groups is intended to correct.</p>
  
  <p>In my app I have enabled App Groups and added a new group but I just can't find any documentation on how to use it. Documentation and API references only state how to add a group.</p>
  
  <p>So what is App Groups really intended to do? Is there any documentation somewhere on how to use it?</p>