如何防止每次加载View Controller时都创建新的AVAudioPlayer类实例 - Swift

I am building a simple Audio Player app using Swift. I have two View Controllers in my Storyboard. The second View Controller creates an instance of the AVAudioPlayer and is used to play audio. I want the user to be able to navigate away from that view controller, use other features in the app and go back to that view controller to manipulate the player.I am building a simple Audio Player app using S