How do you add background music to SpriteKit? - ios

Question

I tried doing this:
let soundFilePath = NSBundle.mainBundle().pathForResource("GL006_SNES_Victory_loop.aif", ofType: "GL006_SNES_Victory_loop.aif")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath!)
let player = AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
player.numberOfLoops = -1 //infinite
player.play()
I put this code in the didMoveToView function, and I have import AVFoundation at the top of my code. I get the error:
Call can throw, but it is not marked with 'try' and the error is not handled.
Thank you in advance!

Answer 1

(Xcode 8 and Swift 3)
Using SpriteKit this is pretty simple. You create an SKAudioNote with a sound file and then you attach it to your Scene as a child. It will loop by default:
override func didMove(to view: SKView) {
let backgroundSound = SKAudioNode(fileNamed: "bg.mp3")
self.addChild(backgroundSound)
}
If you want to stop the background music at some point you can use the build in methods:
backgroundSound.run(SKAction.stop())
Or maybe you want to play the sound again after stopping it:
backgroundSound.run(SKAction.play())
SpriteKit makes this really simple. I hope this helps you.

Answer 2

In Swift 2, the parameter of type NSErrorPointer is left out and can be caught within catch block as follows:
do
{
let player = try AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
}
catch let error as NSError
{
print(error.description)
}
Addendum:
It is better to declare your AVAudioPlayer as an ivar; otherwise, it could be released and thus the music won't play:
class yourViewController: UIViewController
{
var player : AVAudioPlayer!
....
So, given that, we make a minor change to the aforementioned try-catch:
do
{
player = try AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
}
catch let error as NSError
{
print(error.description)
}
Edit:
What you originally have:
let soundFilePath = NSBundle.mainBundle().pathForResource("GL006_SNES_Victory_loop.aif", ofType: "GL006_SNES_Victory_loop.aif")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath!)
let player = AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
player.numberOfLoops = -1 //infinite
player.play()
Hereby adding the catch clause in Swift 2:
let soundFilePath = NSBundle.mainBundle().pathForResource("GL006_SNES_Victory_loop.aif", ofType: "GL006_SNES_Victory_loop.aif")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath!)
do
{
player = try AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
}
catch let error as NSError
{
print(error.description)
}
player.numberOfLoops = -1 //infinite
player.play()
Assuming your class is a subclass of SKScene:
class yourGameScene: SKScene
{
//declare your AVAudioPlayer ivar
var player : AVAudioPlayer!
//Here is your didMoveToView function
override func didMoveToView(view: SKView)
{
let soundFilePath = NSBundle.mainBundle().pathForResource("GL006_SNES_Victory_loop.aif", ofType: "GL006_SNES_Victory_loop.aif")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath!)
do
{
player = try AVAudioPlayer(contentsOfURL: soundFileURL, fileTypeHint: nil)
}
catch let error as NSError
{
print(error.description)
}
player.numberOfLoops = -1 //infinite
player.play()
//The rest of your other codes
}
}