stop first sound when second is playing - ios

Question

I am an absolute beginner in both objective-c and other environments so please be patient. Here is my problem: I need to play sound files so that each of them stops when the other is started, right now they overlap; here is a snippet of my code.
Thank you in advance and let me know if you need other details.
- (IBAction)soundfirst {
NSString *path =
[[NSBundle mainBundle] pathForResource:#"hi2" ofType:#"mp3"];
player1 = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path]
error:NULL];
player1.delegate = self;
[player1 play];
}
- (IBAction)soundsecond {
[player1 stop];
NSString *path =
[[NSBundle mainBundle] pathForResource:#"hi2" ofType:#"mp3"];
player2 = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path]
error:NULL];
player2.delegate = self;
[player2 play];
}

Answer 1

The best way to do something when you're stuck, is to look into the documentation.
In your code, you're creating an object of type AVAudioPlayer, and naming it player1.
AVAudioPlayer Documentation:
http://developer.apple.com/library/ios/#DOCUMENTATION/AVFoundation/Reference/AVAudioPlayerClassReference/Reference/Reference.html
look under the instance methods, and there's a method there called stop.
So in the first method, you can do something like
if(player2.playing){
[player2 stop];
}
[player1 play];

Answer 2

#import <AudioToolbox/AudioServices.h>
SystemSoundID buttonClickSoundID;
+ (void)playButtonClickSound {
if (buttonClickSoundID == 0) {
NSString *soundPath = [[NSBundle mainBundle] pathForResource:#"button_click" ofType:#"wav"];
CFURLRef soundURL = (CFURLRef)[NSURL fileURLWithPath:soundPath];
AudioServicesCreateSystemSoundID(soundURL, &buttonClickSoundID);
}
AudioServicesPlaySystemSound(buttonClickSoundID);
}