swift - 在 Swift 中使用未解析的标识符 NSSecondCalendarUnit

Question

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 

我得到错误:

use of unresolved identifier NSSecondCalendarUnit ...

我错过了什么吗？

Answer 1

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

---

引用:

来自 NSCalendar 类

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