iPhone: How to play a sound at a particular time? - iphone

Question

I have written the following code:
-(void)runTimer
{
myTicker=[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(showActivity) userInfo:nil repeats:YES];
myTicker = [NSTimer scheduledTimerWithTimeInterval:60.00 target:self selector:#selector(vibrate) userInfo:nil repeats:YES];
}
-(void)showActivity
{
NSDateFormatter *formatter =
[[[NSDateFormatter alloc] init] autorelease];
NSDate *date = [NSDate date];
[formatter setTimeStyle:NSDateFormatterMediumStyle];
[timerLabel setText:[formatter stringFromDate:date]];
}
-(void) vibrate{
AudioServicesPlaySystemSound (kSystemSoundID_Vibrate);
}
I want to play an audio file instead of vibrating the iPhone. Is that possible?

Answer 1

Tangential to the main question but the method called by the timer selector should be of the form...
-(void) aribtaryMethodName:(NSTimer *) theTimer;
...or it may not be called properly. It's selector should look like this:
myTicker=[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(aribtaryMethodName:) userInfo:nil repeats:YES];

Answer 2

Check Apple's sample project BubbleLevel. You want the SoundEffect.h and SoundEffect.m into your project and then just call:
mySound = [[SoundEffect alloc]
initWithContentsOfFile:[mainBundle pathForResource:#"mySound"
ofType:#"aif"]];
[mySound play];
Warning: I was able to play only AIF sounds converted via iTunes. Anything else failed, including CAF files. In short: import your whatever sound into iTunes (drag'n'drop), change export to AIF format and then export the file.

Answer 3

Yes. Assume you have a .caf file, you can play it with
SystemSoundID sound_id;
AudioServicesCreateSystemSoundID(NSURL_of_your_caf_file, &sound_id);
...
AudioServicesPlaySystemSound(sound_id);
To play music you may want to use AVAudioPlayer instead.

Answer 4

Sure. See AVAudioPlayer class.

Answer 5

-(IBAction)slider1Changed:(id)sender
{
[timer invalidate];
float sliderValue=slider1.value;
int totalSecond=(int)sliderValue;
time=totalSecond;
int sec= totalSecond %60;
int min= (totalSecond -sec)/60;
sliderValue=(float)totalSecond;
runTime.text=[NSString stringWithFormat:#"%d:%.2d",min,sec];
[slider1 setValue:sliderValue];
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(timerChanged) userInfo:nil repeats:YES];
// to play the audio from particular time duration
[player setCurrentTime:totalSecond];
}
-(void)timerChanged
{
int totalSecond=[player duration];
float slider1Time=(float)time;
if (time <= totalSecond) {
int sec= time %60;
int min= (time -sec)/60;
runTime.text=[NSString stringWithFormat:#"%d:%.2d",min,sec];
[slider1 setValue:slider1Time];
}
else
{
[player stop];
[timer invalidate];
}
time +=1;
}