title: Get access to created class object from another class
body: <p>ViewController1.h</p>
  
  <pre><code>@interface ViewController : UIViewController
  @property AVAudioPlayer *audioPlayer;
  @end
  </code></pre>
  
  <p>ViewController1.m</p>
  
  <pre><code>@synthesize audioPlayer;
  ...
  audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
  [audioPlayer play];
  </code></pre>
  
  <p>How can I stop the music from method in class ViewController2?</p>