Playing sound effects

Playing simple sounds is even easier. We will use SKAction objects to play sounds on specific events, such as when picking up a coin or starting the game.

Adding the coin sound effect to the Coin class

First, we will add a happy sound each time the player collects a coin. To add the coin sound effect, follow these steps:

1. Open Coin.swift and add a new property to the Coin class to cache a coin sound action:

           let coinSound =  
               SKAction.playSoundFileNamed("Sound/Coin.aif",  
               waitForCompletion: false) 

2. Locate the collect function and add the following line at the bottom of the function to play the sound:

           // Play the coin sound: 
           self.run(coinSound) 

That is all you need to do to play the coin sound every time the player collects a coin. You can run the project now to test it out if you like.

To avoid memory-based crashes, it is important to cache each playSoundFileNamed action object and rerun the same object each time you want to...