Question

ViewController1.h

@interface ViewController : UIViewController
@property AVAudioPlayer *audioPlayer;
@end

ViewController1.m

@synthesize audioPlayer;
...
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[audioPlayer play];

How can I stop the music from method in class ViewController2?

Answer 1

Use an NSNotification:

Put this where the user clicks stop music in ViewController2:

[[NSNotificationCenter defaultCenter] postNotificationName:@"stopMusic" object:nil];

and in ViewController1 should have this:

-(void)viewDidLoad:
{
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(stopTheMusic:) name:@"stopMusic" object:nil];
}

-(IBAction)stopTheMusic:(id)sender {
        [audioPlayer stop];
}

Good Luck!