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MBCalendarKit is a calendar control written in UIKit. I've found existing implementations to be inadequate and difficult to work with, so I rolled my own.
MBCalendarKit supports iOS 7+, and works with CocoaPods and Swift.
This project also contains a set of useful categories on NSCalendar and NSDate, so you can easily do date comparisons and date manipulation. Clone the repo and check out the Categories folder.