需要计数定时器，iPhone编程 [英] Count-Up Timer Required, iPhone Programming

问题描述

我是新的iPhone编程，所以希望有人可以帮助我在这里。我已经搜索网络，但只能找到倒计时器的信息。

I am new to iPhone programming so am hoping someone can help me out here. I have searched the web, but can only find information on count down timers.

我想要做的是，当按下按钮时启动计数器，然后当某个值下降，例如5时，停止它，最后显示该时间。我可以在屏幕上显示值，一旦我有他们，但得到的时间在第一个地方是证明对我很难。

What I am looking to do is start a count up timer when a button is pressed and then stop it when a certain value drops by, say 5, and finally display that time. I can display values on screen once I have them, but getting the time in the first place is proving difficult for me.

如果这是一个简单的问题，我期待着阅读您的回复。

I apologize if this is a simple question, but I look forward to reading your responses.

提前感谢，
stu

Thanks in advance, stu

推荐答案

NSDate 将提供当前日期。您可以使用 - （NSTimeInterval）timeIntervalSinceNow
来获取自第一次调用以来的时间。

NSDate will provide the current date. You can use - (NSTimeInterval)timeIntervalSinceNow to get the time since the first call and now.

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