iphone - 用于测量 iPad 或手机代码内精确执行时间的代码？

Question

使用 ma​​ch_absolute_time 和下面 golden eagle 解释的简单 NSDate 方法有什么区别吗？

这是使用 mach 方法的一个很好的解释...

How do I accurately time how long it takes to call a function on the iPhone?

和

Measure time between library call and callback

Answer 1

loop
  {
   NSDate *start = [NSDate date];

  // a considerable amount of difficult processing here
  // a considerable amount of difficult processing here
  // a considerable amount of difficult processing here

   NSDate *methodFinish = [NSDate date];
   NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:start];

   NSLog(@"Execution Time: %f", executionTime);
  }

应该可以。