Swift : Player audio file from another class file
<p>First of all, I just want to let you know I'm a newbie in iOS programming ;)</p>

<p>I would like to know if the following scenario is possible or which way I need to update my code to make it work.
I would like to play an audio file located in the <strong>player class file</strong> within the <strong>ViewController file</strong>.
I added the file "test.wav" to the root of project.</p>

<h2>My problem</h2>

<p>When I play the sound by tapping a button, the program can't find the sound file. I have the following error message: 
<strong>fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)</strong></p>

<h2>Main swift file: ViewController.swift</h2>

<pre><code>import UIKit
import AVFoundation

class ViewController: UIViewController {

    var player1: Player!

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func playAudio(sender: AnyObject) {
        player1.playAudioFile()
    }

}
</code></pre>

<h2>Class file: Player.swift</h2>

<pre><code>import Foundation

import AVFoundation

class Player {

// Variables

    var vc: ViewController!
    var audioFile: AVAudioPlayer!


// Initializer

    init (){

    }

// Methods

    func playAudioFile() {

        if audioFile.playing {
            audioFile.stop()
        } else {
            audioFile.play()
        }
    }

// Intialize ViewController

    init (vc:ViewController!) {

        // Set path for the attack sound

        let audioSnd = NSBundle.mainBundle().pathForResource("test", ofType: "wav")
        let audioFileURL = NSURL(fileURLWithPath: audioSnd!)

        do {

            try audioFile = AVAudioPlayer(contentsOfURL: audioFileURL, fileTypeHint:  nil)
            audioFile.prepareToPlay()

        } catch let err as NSError {
            print(err.debugDescription)
        }
    }
}
</code></pre>

<h2>More information</h2>

<p>My program has a class "Player", with subclasses such as "Human" and "Monster".
By default, my class player has some audio files for attacks, dying, etc. 
Under some conditions, the "player" can become a human or a monster and get custom attack and dying sounds.</p>

<p>Thanks a lot for your help! ;)</p>