Iphone 无法停止背景音乐（Swift 3，Xcode 8）

我在加载视图时运行了一个

AVAudioPlayer

实例。从另一个

ViewController

我有一个

ui开关来停止音乐。我可以从开关接收
Bool
，并看到它在
控制台中调用正确的功能，但我无法让音乐停止播放。我尝试过停止、暂停和更改音量，但都没有效果。当应用程序关闭（双击home并向上滑动）且开关状态保持关闭时，音乐将不会播放。如果打开开关，音乐将播放，但不会停止

代码：

*******交换机代码********

 let optionDefaults = UserDefaults.standard

 @IBOutlet weak var musicOnOff: UISwitch!

 var musicOn : Bool = true

 @IBAction func switchToGame(sender: UIButton) {


    if musicOnOff.isOn{

        musicOn = true
        optionDefaults.set(musicOn, forKey: "musicOn")

    }

    if musicOnOff.isOn == false{

        musicOn = false
        optionDefaults.set(musicOn, forKey: "musicOn")

    }}

override func viewDidLoad() {
    super.viewDidLoad()

if optionDefaults.value(forKey: "musicOn") != nil  {

    let musicOn: Bool = optionDefaults.value(forKey: "musicOn") as! Bool
    if musicOn == false  {

        musicOnOff.isOn = false

    }

    else{

        musicOnOff.isOn  = true

    }
}}

 let optionDefaults = UserDefaults.standard

 @IBOutlet weak var musicOnOff: UISwitch!

 var musicOn : Bool = true

 @IBAction func switchToGame(sender: UIButton) {


    if musicOnOff.isOn{
        musicOn = true
        optionDefaults.set(musicOn, forKey: "musicOn")
    }else{
        musicOn = false
        optionDefaults.set(musicOn, forKey: "musicOn")
    }

    playOrStopMusic()
}

override func viewDidLoad() {
    super.viewDidLoad()
    playOrStopMusic()
}

您仅在视图加载完成时播放音乐。如果您想在切换开关切换时停止并播放音乐，只需在切换开关操作上调用palyOrStopMusic方法

var player:AVAudioPlayer = AVAudioPlayer()

let optionDefaults = UserDefaults.standard

override func viewDidLoad() {

super.viewDidLoad()
     playOrStopMusic()
  }

func playOrStopMusic(){
 do{

        let audioPath = Bundle.main.path(forResource: "backgroundmusic", ofType: "wav")
        try player = AVAudioPlayer(contentsOf: NSURL(fileURLWithPath: audioPath!) as URL)
        player.volume = 0.2

        if optionDefaults.value(forKey: "musicOn") != nil  {

            let musicOn: Bool = optionDefaults.value(forKey: "musicOn") as! Bool
            if musicOn == false  {

                print("********** Music is off **********")
                player.stop()

            }

            else {

                print("********** Music is On **********")
                player.play()

            }  
        } 
    } catch {
       print("AVPlayer did not initialize")
    }

    player.numberOfLoops = -1
}

*******交换机代码********

 let optionDefaults = UserDefaults.standard

 @IBOutlet weak var musicOnOff: UISwitch!

 var musicOn : Bool = true

 @IBAction func switchToGame(sender: UIButton) {


    if musicOnOff.isOn{

        musicOn = true
        optionDefaults.set(musicOn, forKey: "musicOn")

    }

    if musicOnOff.isOn == false{

        musicOn = false
        optionDefaults.set(musicOn, forKey: "musicOn")

    }}

override func viewDidLoad() {
    super.viewDidLoad()

if optionDefaults.value(forKey: "musicOn") != nil  {

    let musicOn: Bool = optionDefaults.value(forKey: "musicOn") as! Bool
    if musicOn == false  {

        musicOnOff.isOn = false

    }

    else{

        musicOnOff.isOn  = true

    }
}}

 let optionDefaults = UserDefaults.standard

 @IBOutlet weak var musicOnOff: UISwitch!

 var musicOn : Bool = true

 @IBAction func switchToGame(sender: UIButton) {


    if musicOnOff.isOn{
        musicOn = true
        optionDefaults.set(musicOn, forKey: "musicOn")
    }else{
        musicOn = false
        optionDefaults.set(musicOn, forKey: "musicOn")
    }

    playOrStopMusic()
}

override func viewDidLoad() {
    super.viewDidLoad()
    playOrStopMusic()
}

您可以包括开关切换的代码吗？似乎viewcontroller只在加载一次开关时检查开关的状态，这不允许您暂停音乐。@DaneJordan，编辑了post以添加开关切换代码，但该代码不起作用，现在当我转到选项viewcontroller时，它会再次启动音乐，以便覆盖音乐