Swift 中的 NSURL 数组错误？

Question

所以我正在尝试创建一个变量，我可以使用它从我创建的 NSURL 数组中选择随机声音。这是数组，也就是导致错误的行：

var levelOneSounds = 
    [
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Barn", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Chicken", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Birds", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Camera", ofType: "mp3")!), NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Cat", ofType: "mp3")!), 
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Crickets", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Glass", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Siren", ofType: "mp3")!), NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Slap", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Snoring", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Toilet Flushing", ofType: "mp3")!),
        NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Wolves Howling", ofType: "mp3")!)
    ]

显然，所有这些都是我存储在Supporting Files 文件夹中的mp3 文件。我还在这里创建了音频播放器：

var levelOneAudioPlayer = AVAudioPlayer()

这是我的 viewDidLoad() 方法，我在其中创建随机声音变量并播放该声音：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    var randomSound = levelOneSounds[Int(arc4random_uniform(UInt32(levelOneSounds.count)))]

    levelOneAudioPlayer = AVAudioPlayer(contentsOfURL: randomSound, error: nil)
    levelOneAudioPlayer.play()
}

然而，每当我运行这个并进入这个视图控制器时，我在数组中得到以下错误：

Thread 1: EXC_BAD_INSTRUCTION (code = EXC_1386_INVOP, subcode = 0 x 0)

如何解决此问题以便播放随机声音？我是编程新手，所以如果我犯了一个明显的错误，我深表歉意。谢谢！

这里是资源文件夹的照片link： http://i.stack.imgur.com/bj3yG.png

Answer 1

发生错误是因为您的声音位于资源文件夹的子文件夹中。

基本功能pathForResource:ofType:不考虑子文件夹。

来自文档：

The method first looks for a matching resource file in the non-localized resource directory of the specified bundle. If a matching resource file is not found, it then looks in the top level of an available language-specific .lproj folder. (The search order for the language-specific folders corresponds to the user’s preferences.) It does not recurse through other subfolders at any of these locations.

你必须使用这个功能

NSBundle.mainBundle().pathForResource("Barn", ofType: "mp3", inDirectory:"Level 1")

或使用一行获取所有 URL 的更有效的函数

let levelOneSounds = NSBundle.mainBundle().URLsForResourcesWithExtension("mp3", subdirectory:"Level 1")

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