title: Are there any good examples of using UIManagedDocument available?
body: <p>I just started a new iOS project and chose to use Core Data with UIManagedDocument. Unfortunately, this is a new class so there aren't many examples out there that use it yet. As a beginner, I would really like to learn from some sample code or tutorials about UIManagedDocument. </p>
  
  <p>Are there any good examples of or tutorials about the use of UIManagedDocument with Core Data on iOS?</p>