Objective-C

unsigned unitFlags = NSCalendarUnitYear
				   | NSCalendarUnitMonth
				   | NSCalendarUnitDay
				   | NSCalendarUnitWeekday
				   | NSCalendarUnitHour
				   | NSCalendarUnitMinute
				   | NSCalendarUnitSecond;

Swift 2.0

let unitFlags: NSCalendarUnit = [ .Year,
								  .Month,
								  .Day,
								  .Weekday,
								  .Hour,
								  .Minute,
								  .Second ]

Swift 1.2

let unitFlags: NSCalendarUnit = .CalendarUnitYear
							  | .CalendarUnitMonth
							  | .CalendarUnitDay
							  | .CalendarUnitWeekday
							  | .CalendarUnitHour
							  | .CalendarUnitMinute
							  | .CalendarUnitSecond