title: OSX making NSCollectionView in Xcode 6.4 with objective c
body: <p>I have looked up a lot of resources for programming  NSCollectionView  but couldn't find any please help.</p>
  
  <p>Seen following but not working:</p>
  
  <p>1.<a href="https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CollectionViews/Introduction/Introduction.html" rel="nofollow">https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CollectionViews/Introduction/Introduction.html</a>
  2. not found any relevant source code on github
  3.watched-<a href="https://www.youtube.com/watch?v=dw-sHMTsMVs" rel="nofollow">https://www.youtube.com/watch?v=dw-sHMTsMVs</a> but outdated.</p>
  
  <p>please help.</p>