how to play audioplayer in ios using AVAudioplayer - ios

Question

I am trying to create AVAudioPlayer Programatically.I Have small issue if i play audioplayer.
I am displaying 12 audio items in UITableview.If i click first item that corresponding song will play.I should not click any pass button.i click back button and click second item.if i click second item the audio view controller will display.I click play button the song display.In first song and second song play simultaneously.This is my issue.Please help me anybody.
-(void)playOrPauseButtonPressed:(id)sender
{
if(playing==NO)
{
[playButton setBackgroundImage:[UIImage imageNamed:#"Pause.png"] forState:UIControlStateNormal];
// Here Pause.png is a image showing Pause Button.
NSError *err=nil;
AVAudioSession *audioSession=[AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSLog(#"%# %d",urlsArray,selectedIndex);
NSString *sourcePath=[urlsArray objectAtIndex:selectedIndex];
NSData *objectData=[NSData dataWithContentsOfURL:[NSURL URLWithString:sourcePath]];
audioPlayer = [[AVAudioPlayer alloc] initWithData:objectData error:&err];
audioPlayer.numberOfLoops = 0;
[audioPlayer prepareToPlay];
audioPlayer.delegate=self;
[audioPlayer play];
playing=YES;
}
else if (playing==YES)
{
[playButton setBackgroundImage:[UIImage imageNamed:#"play.png"] forState:UIControlStateNormal];
[audioPlayer pause];
playing=NO;
}
if (self.audioPlayer)
{
[self updateViewForPlayerInfo];
[self updateViewForPlayerState];
[self.audioPlayer setDelegate:self];
}
}
-(void)updateViewForPlayerInfo
{
self.songDuration.text = [NSString stringWithFormat:#"%d:%02d", (int)self.audioPlayer.duration / 60, (int)self.audioPlayer.duration % 60, nil];
NSLog(#"%f", self.audioPlayer.duration);
self.progressBar.maximumValue = self.audioPlayer.duration;
self.volumeSlider.value = self.audioPlayer.volume;
}
-(void)updateViewForPlayerState
{
[self updateCurrentTime];
if (self.updatedTimer)
{
[self.updatedTimer invalidate];
}
if (self.audioPlayer.playing)
{
self.updatedTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:#selector(updateCurrentTime) userInfo:self.audioPlayer repeats:YES];
}
}
-(void)updateCurrentTime
{
//NSLog(#"self.audioPlayer.currentTime = %f", self.audioPlayer.currentTime);
self.currentTime.text = [NSString stringWithFormat:#"%d:%02d", (int)self.audioPlayer.currentTime / 60, (int)self.audioPlayer.currentTime % 60, nil];
self.progressBar.value = self.audioPlayer.currentTime;
}
-(void)volumeSliderMoved:(UISlider *)sender
{
self.audioPlayer.volume=[sender value];
}

Answer 1

before creating a new instance of AVAudioPlayer, deallocate or nil the existing instance of player by using following lines
sourcePath=Nil;
[audioPlayer stop];
audioPlayer = Nil;

Answer 2

Stop the player when you go back. Maybe in ViewWillDisappear or before you create a new instance of audioplayer, you can call
if(self.audioplayer) {
[self.audioPlayer stop];
self.audioPlayer = nil;
}

Answer 3

Before initializing the AVAudioPlayer remove all the instances that are running before.
//YOUR STUFF
NSString *sourcePath=[urlsArray objectAtIndex:selectedIndex];
NSData *objectData=[NSData dataWithContentsOfURL:[NSURL URLWithString:sourcePath]];
for (AVAudioPlayer *a in urlsArray)
[a stop];
audioPlayer = [[AVAudioPlayer alloc] initWithData:objectData error:&err];
audioPlayer.numberOfLoops = 0;
//REST STUFF