How to calculate the time taken by one process in objective c?

Question

Hey there, I am fresh to iPhone development and Objective C. Sorry if this question is too stupid....

Here is my problem, I want to calculate the time taken by one of my function. like UIGetScreenImage. Here is the code:

-(void)screenCapture{
   CGImageRef screen = UIGetScreenImage();
   UIImage* image = [UIImage imageWithCGImage:screen];
   CGImageRelease(screen);
   UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

what should I do to calculate the time taken by this process? Sample code would be appreciated.

Thanks for your kind assistance. Look forward to your replies and ideas. :D

Answer 1

You can get current date on method start and finish and check time passed between those 2 moments:

-(void)screenCapture{
   NSDate* startDate = [NSDate date];
   ...
   NSDate* finishDate = [NSDate date];
   NSLog(@"%f", [finishDate timeIntervalSinceDate: startDate]);
}