我尝试从当前日期获取小时数：
var date:NSDate = NSDate()
var calendar:NSCalendar = NSCalendar.currentCalendar()
var components:NSDateComponents = calendar.components(unitFlags: NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit, fromDate: date)
var hour = components.hour
var minute = components.minute
var seconds = components.second
但是，它无法识别日历单位：
NSHourCalendarUnit, NSMinuteCalendarUnit andNSSecondCalendarUnit
我收到错误消息：
use of unresolved identifier NSSecondCalendarUnit ...
我想念什么吗？
使用NSCalendarUnit常量代替
var date:NSDate = NSDate()
var calendar:NSCalendar = NSCalendar.currentCalendar()
var components:NSDateComponents = calendar.components(
NSCalendarUnit.CalendarUnitHour | NSCalendarUnit.CalendarUnitMinute | NSCalendarUnit.CalendarUnitSecond, fromDate: date)
var hour = components.hour
var minute = components.minute
var seconds = components.second
参考：
从NSCalendar班级
func components(unitFlags: NSCalendarUnit, fromDate date: NSDate!) -> NSDateComponents!
^^^^^^^
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