Ios Apple Swift:如何在1/100或1/1000内获得当前秒数?
我想知道如何更改此代码,以便在counterlabel.text中显示1/10或1/100或1/1000秒。Ios Apple Swift:如何在1/100或1/1000内获得当前秒数?,ios,swift,nsdate,nscalendar,Ios,Swift,Nsdate,Nscalendar,我想知道如何更改此代码,以便在counterlabel.text中显示1/10或1/100或1/1000秒。 就是想不出来。。。谢谢 有一个纳秒的日历单位: func updateTime() { var date = NSDate() var calendar = NSCalendar.currentCalendar() var components = calendar.components(.CalendarUnitSecond, fromDate: date)
就是想不出来。。。谢谢 有一个纳秒的日历单位:
func updateTime() {
var date = NSDate()
var calendar = NSCalendar.currentCalendar()
var components = calendar.components(.CalendarUnitSecond, fromDate: date)
var hour = components.hour
var minutes = components.minute
var seconds = components.second
counterLabel.text = "\(seconds)"
var myIndicator = counterLabel.text?.toInt()
if myIndicator! % 2 == 0 {
// do this
} else {
// do that
}
}
Swift 3的更新
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitNanosecond, fromDate: date)
let nanoSeconds = components.nanosecond
let fmt = NSDateFormatter()
fmt.dateFormat = "HH:mm:ss.SSS"
counterLabel.text = fmt.stringFromDate(date)
这将以10-9秒为单位给出秒的小数部分。
对于毫秒,只需将该值除以106:
或者,如果您只想显示分数
秒,使用NSDateFormatter
和SSS
格式。例如:
let milliSeconds = nanoSeconds / 1_000_000
Swift 3的更新
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitNanosecond, fromDate: date)
let nanoSeconds = components.nanosecond
let fmt = NSDateFormatter()
fmt.dateFormat = "HH:mm:ss.SSS"
counterLabel.text = fmt.stringFromDate(date)
请注意,代码中的所有变量实际上都可以定义为常量(
let
),谢谢,Martin。工作得很有魅力!