在Objective-C中花费时间 [英] Getting time elapsed in Objective-C

问题描述

我需要在两个事件之间花费时间，例如，UIView的出现和用户的第一反应。

I need to get the time elapsed between two events, for example, the appearance of a UIView and the user's first reaction.

如何在Objective中实现它-C？

How can I achieve it in Objective-C?

推荐答案

NSDate *start = [NSDate date];
// do stuff...
NSTimeInterval timeInterval = [start timeIntervalSinceNow];

timeInterval 是start和now之间的区别，以秒为单位，精确度为亚毫秒。

timeInterval is the difference between start and now, in seconds, with sub-millisecond precision.

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