UICollectionView Example with UICollectionViewFlowLayout

I’m waiting for some friends to come into town tonight so I thought I might throw together a very basic UICollectionViewFlowLayout example.

It demonstrates proper use of:

  • UICollectionViewFlowLayout properties and basic subclassing.
  • How to properly implement UICollectionViewCell subclasses.
  • How to change layouts (with animation).
  • How to set up a collection view without a .xib or Storyboard.

Important things to note:

  • Always invalidate a layout before setting giving it to a collection view to use. This is really important if your app supports more than one orientation.
  • Always reset UICollectionViewCells to neutral when you override prepareForReuse.
  • Always use setCollectionViewLayout:animated: to change a layout with animation – never set the property in an animation block and assume it will work.

These are just a few of the gems I’ve picked up while writing a short book on UICollectionView. I’ll let you know when it’s available for sale.

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I’ll probably add more layouts to it other than small and large ones. If anyone has anything they want to add or suggestions, let me know.


Posted on February 5, 2013