Pause music with a button in another scene in Xcode

Question

So I have a music that starts playing in the AppDelegate (when the app is loaded basically), and I want to make it stop once I press a button on my settings scene that has its own ViewController class. How can this be achieved? How can I access the variable I have on my appDelegate class that starts the music? Here's the code for starting the music in AppDelegate:

var themeAudioURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("theme", ofType: "mp3")!)

var themePlayer = AVAudioPlayer()

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    themePlayer = AVAudioPlayer(contentsOfURL: themeAudioURL, error: nil)

    themePlayer.volume = 0.05
    themePlayer.numberOfLoops = -1
    themePlayer.play()
    return true
}

Answer 1

You can pass player further to the next scene. You can do this in prepare for segue method. Alternatively you can get an app delegate in another view controller and cast it to your appdelegate implementation.