本文介绍了如何从 NSTimer 中找到剩余的时间间隔的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我设置了一个 NSTimer.scheduledTimerWithTimeInterval
方法,该方法每 20 分钟间隔一次.我希望能够找出应用程序进入后台模式时还剩下多少时间.我如何知道间隔还剩多少时间?
I have set a NSTimer.scheduledTimerWithTimeInterval
method which has an interval every 20 minutes. I want to be able to find out how much time is left when the the app goes into background mode. How do I find out how much time is left from the interval?
谢谢
推荐答案
您可以访问 NSTimer 的 fireDate
,它会告诉您计时器何时将再次触发.
You have access to a NSTimer's fireDate
, which tells you when the timer is going to fire again.
现在和 fireDate
之间的区别是您可以使用 NSDate 的 timeIntervalSinceDate
API.
The difference between now and the fireDate
is an interval you can calculate using NSDate's timeIntervalSinceDate
API.
E.G.类似:
let fireDate = yourTimer.fireDate
let nowDate = NSDate()
let remainingTimeInterval = nowDate.timeIntervalSinceDate(fireDate)
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