Swift中未解析标识符单位的使用

我尝试从当前日期获取小时分钟数：

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，它不识别日历单位：

NSHourCalendarUnit, NSMinuteCalendarUnit andNSSecondCalendarUnit 

我得到一个错误：

use of unresolved identifier NSSecondCalendarUnit ...

---

我遗漏了什么吗？

使用

NSCalendarUnit

常量

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

class

func components(unitFlags: NSCalendarUnit, fromDate date: NSDate!) -> NSDateComponents!
                             ^^^^^^^

---

改用

NSCalendarUnit

常量

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

class

func components(unitFlags: NSCalendarUnit, fromDate date: NSDate!) -> NSDateComponents!
                             ^^^^^^^

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对于Swift 2.0，您必须对上面第3行使用以下语法：var组件：NSDateComponents=calendar.components（[.Hour、.Minute、.Second]，fromDate:date）对于Swift 2.0，您必须对上面第3行使用以下语法：var组件：NSDateComponents=calendar.components（[.Hour、.Minute、.Second]，fromDate:date）