Question

您好我是一名初学程序员，正在尝试创建一个基本的音板模板。我的代码在AppDelegate中获得了信号SiGABRT，我不明白为什么。有人可以告诉我我的代码有什么问题，或者提供我可以用来创建音板的代码。这是我到目前为止我的ViewController，任何帮助将不胜感激：

Class SoundListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var tableView: UITableView!
    var audioPlayer = AVAudioPlayer()
    var soundsArray: [Sound] = []
    var session = AVAudioSession.sharedInstance()
    var audioNSURL = NSURL()

override func viewDidLoad() {
    super.viewDidLoad()
    self.tableView.dataSource = self
    self.tableView.delegate = self

    let samplePath = NSBundle.mainBundle().pathForResource("RandomSound", ofType: "m4a")
    audioNSURL = NSURL.fileURLWithPath(samplePath!)!
    audioPlayer = AVAudioPlayer(contentsOfURL: audioNSURL, error: nil)
    audioPlayer.prepareToPlay()

    var soundPath = NSBundle.mainBundle().pathForResource("RandomSound1", ofType: "m4a")
    var soundURL = NSURL.fileURLWithPath(soundPath!)
    var sounds1 = Sound()
    sounds1.name = "Sound1"
    sounds1.URL = soundURL!
    self.soundsArray.append(sounds1)

    soundPath = NSBundle.mainBundle().pathForResource("RandomSound2", ofType: "m4a")
    soundURL = NSURL.fileURLWithPath(soundPath!)
    var sounds2 = Sound()
    sounds2.name = "Sound2"
    sounds2.URL = soundURL!
    self.soundsArray.append(sounds2)

    soundPath = NSBundle.mainBundle().pathForResource("RandomSound3", ofType: "m4a")
    soundURL = NSURL.fileURLWithPath(soundPath!)
    var sounds3 = Sound()
    sounds3.name = "Sound3"
    sounds3.URL = soundURL!
    self.soundsArray.append(sounds3)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.soundsArray.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    var cell = UITableViewCell()
    cell.textLabel?.text = self.soundsArray[indexPath.row].name
    println(cell)
    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    var sound = self.soundsArray[indexPath.row]
    var baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as! String
    var pathComponents = [baseString, sound.URL]

    var rowSoundURL = NSURL.fileURLWithPathComponents(pathComponents)!


    if audioPlayer.playing && rowSoundURL == audioNSURL {

        audioPlayer.stop()

    } else {

        audioNSURL = rowSoundURL

        self.audioPlayer = AVAudioPlayer(contentsOfURL: audioNSURL, error: nil)
        self.audioPlayer.play()

    }

    tableView.deselectRowAtIndexPath(indexPath, animated: true)

}

Answer 1

它在您的代码中是一个简单的错误;-)在viewDidLoad（） - 方法中，您只需将soundURL变量设置为媒体文件的完整路径（在本例中为RandomSound1.m4a等）< / p>

在didSelectRowAtIndexPath（） - 表视图委托的方法中，您执行以下操作：

var sound = self.soundsArray[indexPath.row]
var baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as! String
var pathComponents = [baseString, sound.URL]

然后

var rowSoundURL = NSURL.fileURLWithPathComponents(pathComponents)!

这就是应用程序崩溃的部分。发生这种情况是因为NSURL类尝试根据baseString和sound.URL创建URL（如RFC 1808,1738和2732中定义的）。如果将这些检查到变量，它将如下所示：

sound.URL => "file:///private/var/mobile/Containers/Bundle/Application/2D30CB30-919A-4253-AEFD-7386ED63A553/soundboard.app/take_5.m4a"

baseString => "/var/mobile/Containers/Data/Application/63ADE8EB-DAE0-49E0-83A7-88378F675F9D/Documents"

因此，当您现在组合这两个变量时，路径格式错误，导致崩溃。相反，你可以使用sound.URL，它会做你想要的。

我是这样实现的：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        var sound = self.soundsArray[indexPath.row]
        var baseString = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as! String

        if let rowSoundURL = sound.URL {
            if audioPlayer.playing && rowSoundURL == audioNSURL {

                audioPlayer.stop()

            } else {

                audioNSURL = rowSoundURL

                self.audioPlayer = AVAudioPlayer(contentsOfURL: audioNSURL, error: nil)
                self.audioPlayer.play()

            }
        }
        tableView.deselectRowAtIndexPath(indexPath, animated: true)
    }

注意：在我的例子中，Sound的URL变量是可选的。让我知道它是否有效

Swift Soundboard App

1 个答案: