Stopping Audio from different class - objective-c

Question

Note: I have looked at other questions and the answers to them are quite vague or unhelpful
I have this code in View_Controller.h
#property AVAudioPlayer *playerSaxophone;
Then I do this in the same file (in viewDidLoad):
NSURL *backgroundMusicSaxophone = [NSURL fileURLWithPath:
[[NSBundle mainBundle]
pathForResource:#"saxophone" ofType:#"wav"]];
self.playerSaxophone = [[AVAudioPlayer alloc]
initWithContentsOfURL:backgroundMusicSaxophone error:nil];
self.playerSaxophone.numberOfLoops = -1;
[self.playerSaxophone setVolume:0.5];
[self.playerSaxophone play];
In a different view controller I want to be able to stop or start this audio from playing by clicking 2 buttons. Is there any way I can do this?
Edit: I tried this in the "different" view controller .m file
//I do import ViewController.h in this file
- (IBAction)stop:(id)sender {
ViewController *viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[viewController.playerSaxophone stop];
}
But it didn't work.

Answer 1

You need to call:
[playerSaxophone stop];
to make the music stop.
Problem: Another view controller won't have a reference to playerSaxophone.
The fact that you want to add code that references this from another view controller means you'll have to find a way to have the three objects - view controller A, view controller B, and your audio player - communicate.
Here are a few options:
Use the delegation pattern to have one view controller tell the other view controller to stop the player.
The same as #1, but using the notification pattern. (This is ideal if you'd have a 3rd place that controls the player).
You could move playerSaxophone to be a #property on either your App Delegate or a singleton. Then each view controller will be able to find it.
These are just a few solutions. There are others.
Additional reading:
Apple's Coordinating Efforts Between View Controllers
This Stack Overflow answer
How do I set up a simple delegate to communicate between two view controllers?