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Playing a random audio file with Swift

I keep getting the following error when I use Shake Gesture in the iPhone simulator:

Fatal error: Unexpectedly found zero while expanding optional value

Here is my code:

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var soundFiles = ["kidLaughing", "pewpew", "pingas", "runningfeet"]
    var player: AVAudioPlayer = AVAudioPlayer()

    override func motionEnded(motion: UIEventSubtype, withEvent event: UIEvent) {
        if event.subtype == .MotionShake {
            var randomSoundFile = Int(arc4random_uniform(UInt32(soundFiles.count)))
            var fileLocation = NSString(string:NSBundle.mainBundle().pathForResource("sounds/" + soundFiles[randomSoundFile], ofType: "mp3")!)

            var error: NSError? = nil

            player = AVAudioPlayer(contentsOfURL: NSURL(string: fileLocation), error: &error)

            player.play()
        }
    }
}

I have a folder named sounds

with 4 mp3

files located in it. The error is on this line of code:

  var fileLocation = NSString(string:NSBundle.mainBundle().pathForResource("sounds/" + soundFiles[randomSoundFile], ofType: "mp3")!)

I tried everything I could to get this to work, but nothing I tried worked. Any help is appreciated!

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5 answers


This means that there is a value that is zero when you state that it is not. Divide the fault line into your components and find out exactly what is zero:

var soundFile = soundFiles[randomSoundFile]
var path = "sounds/" + soundFile
var fullPath = NSBundle.mainBundle().pathForResource(path, ofType: "mp3")!
var fileLocation = NSString(string:fullPath) // fyi, this line is pointless, fullPath is already a string


I would assume it crashes on the pathForResource line because the file cannot actually be found. Make sure you actually link the "sounds" directory in your kit.

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// You can try this also for random sound playback.

import UIKit
import AVFoundation
class GameScene: SKScene {
var pinballVoiceArray = ["BS_PinballBounce1.mp3", "BS_PinballBounce2.mp3", "BS_PinballBounce3.mp3"]
var randomIndex = 0
override func didMoveToView(view: SKView) {
    //use the random sound function
    playPinballSound()
   }
func playPinballSound () {
    randomIndex = Int(arc4random_uniform(UInt32(pinballVoiceArray.count)))
    var selectedFileName = pinballVoiceArray[randomIndex]
    runAction(SKAction.playSoundFileNamed(selectedFileName, waitForCompletion: false))
    }
}


// Call the playPinballSound function where you want to play the random sound.

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    let path = NSBundle.mainBundle().pathForResource("Ring", ofType: "mp3")
    let fileURL = NSURL(fileURLWithPath: path!)
    play = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
    play.prepareToPlay()
    play.delegate = self
    play.play()

This is just an example

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I had the same problem.

I solved this by choosing "Create Folder Links" instead of "Create Groups" when copying the sound folder to the project.

Hope it works for you too. I'm very new to Swift and all iOS programming, so I don't know what exactly is going on behind the scenes.

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I had the same problem. What I did was just "Add files to MyProject ..." and add the whole sound folder. Once Swift had a link to this folder, there was no need to include this folder in the pathForResource parameter.

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