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POGet time interval and play a sound in objective C
 

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    <p>I am new to Object C, and I have two questions but I can not find the answers on stackoverflow.</p> <p>My iOS app is simple, one button on the screen, and if user tap it, it will:</p> <ol> <li><p>play a sound</p></li> <li><p>get the time interval between 2 taps in millisecond.</p></li> </ol> <p>Thanks to Owl, now the code to get the interval look like this:</p> <p>(Long coding since I don't understand what is "UNIX time stamp" and I don't know where/how to use the second code.)</p> <pre><code>double dt1; double dt2; -(IBAction)Beated:(id)sender{ If (FB == 1) { FB = 2; NSDate *date = [NSDate date]; NSTimeInterval ti = [date timeIntervalSince1970]; dt1 = ti; } else { FB = 1 NSDate *date = [NSDate date]; NSTimeInterval ti = [date timeIntervalSince1970]; dt2 = ti; double progress; progress = dt2 - dt1; int timeInMs = trunc(progress * 1000); NSLog(@"Interval %d", timeInMs); } } </code></pre> <p>And after start the app, there is a lag when the sound was played for the first time, but it works good after the first tap. How to stop that lag?</p> <p>My code to play the sound:</p> <p>in .h</p> <pre><code>#import &lt;AVFoundation/AVFoundation.h&gt; </code></pre> <p>and</p> <pre><code>AVAudioPlayer *audioPlayer; </code></pre> <p>in .m</p> <pre><code> -(IBAction)Beated:(id)sender { NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/ssn.wav", [[NSBundle mainBundle] resourcePath]]]; NSError*error; audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:$error]; audioPlayer.numberOfLoops = 0; [audioPlayer play]; } </code></pre> <p>Thanks </p>
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