线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x48）

Question

我在XCODE上使用swift。我遇到了这个问题，如果我想单击我的按钮来播放声音。它会崩溃。我有viewcontrollers。第一个ViewController连接到一个Storyboard。该故事板具有按钮播放声音。当我运行它时，声音会播放。当转到第二个故事板播放声音时，它会崩溃

[2张图片是我用来播放音频的代码。我在第一个viewcontroller上粘贴了相同的代码。]这就是第二个viewcontroller上的代码。当我按下第二个情节提要板上的按钮时，我得到了线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x48），但在我按下的第一个按钮上却没有得到此错误。

当我运行模拟器并进入第二个视图控制器时会发生

class Level1ViewController: UIViewController, AVAudioPlayerDelegate {

    var player: AVAudioPlayer = AVAudioPlayer()
    var correctPlayer: AVAudioPlayer = AVAudioPlayer()
    var wrongPlayer: AVAudioPlayer = AVAudioPlayer()




    @IBAction func correctAnswer(_ sender: Any) {
        correctPlayer.play()
    }

    @IBAction func playOne(_ sender: Any) {
        player.play()
    }
    @IBOutlet weak var option2: UIButton! // wrong answer

    @IBAction func wrongAnswer1LV(_ sender: Any) {
    }


    @IBOutlet weak var option1: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()


        //View Controller 1 - Working

        do {
            let audioPlayer = Bundle.main.path (forResource: "bark", ofType: "wav")

            try player = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayer!)as URL)
        }

        catch {
            //ERROR!
        }

        do {
            let audioPlayer2 = Bundle.main.path (forResource: "Ding-Sound-Effect_qZC5gtOw3DU", ofType: "mp3")

            try correctPlayer = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayer2!)as URL)
        }

        catch {
            //ERROR!
        }

View Controller 2-不起作用（给出错误）

class Level2LevelViewController: UIViewController, AVAudioPlayerDelegate {

    var player: AVAudioPlayer = AVAudioPlayer()
    var correctPlayer: AVAudioPlayer = AVAudioPlayer()
    var wrongPlayer: AVAudioPlayer = AVAudioPlayer()

    @IBAction func levelTwoPLay(_ sender: Any) {
        correctPlayer.play()  **** THREAD 1: EXC_BAD_ACESS****
    }



    override func viewDidLoad() {
        super.viewDidLoad()


        do {
            let audioPlayerII = Bundle.main.path (forResource: "Door Open and Close Slam Sound Effects", ofType:"mp3")

            try player = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayerII!)as URL)
        }

        catch {
            //ERROR!!
        }

    leveltwoOp1.backgroundColor = UIColor.black
    leveltwoOp2.backgroundColor = UIColor.black
    leveltwoOpTh.backgroundColor = UIColor.black
    leveltwoOp4.backgroundColor = UIColor.black

Answer 1

您正在View Controller 1中创建一个correctPlayer对象，并使用以下方法对其进行了初始化：

try correctPlayer = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayer2!)as URL)

那很好。...但是在View Controller 2中，您可以：

var correctPlayer: AVAudioPlayer = AVAudioPlayer()

创建correctPlayer的 new 实例，该实例仅在View Controller 2的作用域内，然后您调用：

correctPlayer.play()

没有初始化它。

在View Controller 2内部，您需要再次调用：

    do {
        let audioPlayer2 = Bundle.main.path (forResource: "Ding-Sound-Effect_qZC5gtOw3DU", ofType: "mp3")

        try correctPlayer = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayer2!)as URL)
    }

    catch {
        //ERROR!
    }

之后，您应该可以播放该声音。

Answer 2

第一个视图控制器具有以下代码：

let audioPlayer2 = Bundle.main.path (forResource: "Ding-Sound-Effect_qZC5gtOw3DU", ofType: "mp3")
try correctPlayer = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPlayer2!)as URL)

但是第二个视图控制器没有该代码。因此其correctPlayer已损坏。