title: Ready to use iOS UIScrollView with lazy loading of cells for displaying a "shelf" of book covers?
body: <p>I want to display a number of book and magazine covers in my app (similar to the shelf view in iBooks). So far I have implemented my own UIScrollView which displays the covers just fine - unfortunately due to performance problems, I'm forced to rewrite the whole view; however I'm sure that someone else has solved this already and probably made it an open source project (possibly part of a bigger UI toolkit/library?).</p>
  
  <p>Unfortunately I didn't get far by consulting Google, Google Code and github. There are a lot of projects, most of them are examples and tests or abadoned.</p>
  
  <p>So basically I'm looking for a UIScrollView based class with the following features:</p>
  
  <ul>
  <li>Possibility to define a cell size (of the thumbnail/cover)</li>
  <li>Automatic layout depending on available space</li>
  <li>Lazy loading (using a delegate which provides the cell contents)</li>
  </ul>
  
  <p>Basically a UITableView, but for book shelfs.</p>
  
  <p>Any pointers to existing projects or toolkits are highly appreciated!</p>
  
  <p>Thanks!</p>