Crashing before the app starts

Question

override func viewWillLayoutSubviews() {
    let bgMusicURL:NSURL = NSBundle.mainBundle().URLForResource("bgmusic", withExtension: "mp3")!
    backgroundMusicPlayer = try! AVAudioPlayer(contentsOfURL: bgMusicURL)
    backgroundMusicPlayer.numberOfLoops = -1
    backgroundMusicPlayer.prepareToPlay()
    backgroundMusicPlayer.play()

    // Configure the view
    let skView:SKView = self.view as! SKView
    //skView.showsFPS = true
    //skView.showsNodeCount = true

    // Create and Configure the sciene
    let scene:SKScene = GameScene(size: skView.bounds.size)
    scene.scaleMode = SKSceneScaleMode.AspectFill
    skView.presentScene(scene)

I'm getting

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

and it's crashing the app before it even starts. New to programming btw.

Thank You

score 0 · Answer 1 · answered Nov 19 '15 at 00:18

The reason this is happening is because your code isn't safe at all! In your first line you force unwrap a url that may or may not be able to be formed by the system, and then in the next line you force a try without catching any errors. I suspect, however, that the error is in your first line. The system can't find the music file you're trying to load, but you're force unwrapping it, which will cause it to crash.

Crashing before the app starts

1 Answers1