在OS X版本10.10中不推荐使用'YearCalendarUnit':改为使用NSCalendarUnitYear

Question

我的代码:

 let calendar = NSCalendar.currentCalendar()
 let dateComponents = calendar.components(NSCalendarUnit.YearCalendarUnit | NSCalendarUnit.MonthCalendarUnit | NSCalendarUnit.DayCalendarUnit, fromDate: self)

我的错误:

'YearCalendarUnit' was deprecated in OS X version 10.10: Use NSCalendarUnitYear instead
'MonthCalendarUnit' was deprecated in OS X version 10.10: Use NSCalendarUnitMonth instead
'DayCalendarUnit' was deprecated in OS X version 10.10: Use NSCalendarUnitDay instead

但我不能键入NSCalendarUnitYear以及(NSCalendarUnitMonth/NSCalendarUnitDay)有什么问题？

Answer 1

使用 let dateComponents = calendar.components(.CalendarUnitYear | .CalendarUnitMonth | .CalendarUnitDay, fromDate: self)

编辑:
这是因为错误消息是针对Objective-C的,不适合swift.

编辑2:看看Will对Swift 2及其评论的评论.