AVAudioPlayer play sound from the beginning

[Sania]

Hello to all. I am new to programming. I am making my first iphone app with sounds, and i want when i press the sound button second time to stop and play at begin the sound, but now its playing two times at same time, this code i use, i add the if statement but it not working

-(IBAction)playSound:(id){

 NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"SoundFile" ofType:@"caf"]];
  player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
 [player setNumberOfLoops:0];
 [player prepareToPlay];



if (player.playing) 
{
   [player pause];
   player.currentTime = 0;
}
  [player play];

}

but it works fine in next code,

- (void)viewDidLoad {

NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"SoundFile" ofType:@"caf"]];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[player setNumberOfLoops:0];
[player prepareToPlay];

}

-(IBAction)play:(id)sender
{
 if (player.playing) {
     [player pause];
     player.currentTime = 0;
 }

 [player play];
}

and the problem is with second code working only with 2 sounds , if i add more that 2 my app not working... help me please to make it work normal

Thanks!!