Cocoa audio issues

1. I have 2 buttons, 1 turns to the next page and should play a sound at the same time but the sound doesn't seems to be working, I need your help on this please.

2. I have 4 pages and in each page there is a play button that play or stop the audio, but if I press play and press next to the next page, the audio will keep playing, how do I do so that if I press the next button, it will stop the music automatically. Thanks for your help, find below the code.

   - (IBAction)next {
   
       // This part plays the next page turn noise
       NSURL *this = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/next.mp3", [[NSBundle mainBundle] resourcePath]]];
   
       NSError *error;
       audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:this error:&error];
       [audioPlayer setDelegate:self];
       audioPlayer.numberOfLoops = 0;
       [audioPlayer play];
   开发者_运维技巧
       // This part takes us to the next view
       Rabbana2 *rab = [[Rabbana2 alloc] initWithNibName:@"Rabbana2" bundle:nil];
       [UIView beginAnimations:@"flipView" context:Nil];
       [UIView setAnimationDuration:2];
       [UIView setAnimationCurve:UIViewAnimationOptionCurveEaseInOut];
       [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
   
       [self.view addSubview:rab.view];
       [UIView commitAnimations];
   
   }
   
   // This button plays the audio
   - (IBAction)play {
   
       if(clicked == 0){
           clicked = 1;
           NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/rabbana1.wav", [[NSBundle mainBundle] resourcePath]]];
   
           NSError *error;
           audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
           [audioPlayer setDelegate:self];
           audioPlayer.numberOfLoops = 0;
   
   
           [audioPlayer play];
           [start setImage:[UIImage imageNamed:@"Sstop.png"] forState:UIControlStateNormal];
   
       } 
       else{
           [audioPlayer release];
           clicked = 0;
           [start setImage:[UIImage imageNamed:@"Pplay.png"] forState:UIControlStateNormal];
       } 
   
   }
   
   //If user does not do anything by the end of the sound set the button to start
   - (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player
                           successfully: (BOOL) flag {
       if (flag==YES) {
           clicked = 0;
           [start setImage:[UIImage imageNamed:@"Pplay.png"] forState:UIControlStateNormal];
       }
   }
   

In your method which handles the page turn, you need to stop the current playing sound by using [audioPlayer stop] if it is playing