A couple weeks ago we released a new open-source component on our Github account.
PDTSimpleCalendar is a very simple calendar/date picker component for your iOS apps based on UICollectionView.
It has a very light and clean design inspired by Apple Calendar app.
PDTSimpleCalendar supports all calendar supported by NSCalendar and is very easy to use and customize. Colors can be changed using properties or UIAppearance proxy.
Check it out on our Github account: jivesoftware/PDTSimpleCalendar · GitHub
At Jive, we use it in the Producteev app to set deadline for tasks:
Hope you'll like it!