Swift：使用開關關閉按鈕聲音

Question

我正在構建一個簡單的計數器，每次按下按鈕時都會發出聲音。 但是，我使用開關將聲音靜音的解決方案無效。有沒有什麼辦法來靜音AVAudioPlayer？停止似乎沒有幫助，我想這很正常，因爲沒有連續播放音樂。 這裏是我的代碼：

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

var rowValue: Int = 0 

let motivationalQuotes: [String] = ["xxx", "xxx", "xxx", "xxx", "xxx", "xxx", "xxx", "xxx", "xxx", ] 

@IBOutlet weak var motivationLabel: UILabel! 

@IBAction func subtractRowButton(sender: AnyObject) { 
    if rowValue > 0 { 
     rowValue = rowValue - 1 
    } else { 
     rowValue = 0 
    } 

    rowCount.text = "\(rowValue)" 

    playSubtractSound() 
    motivateThem() 

} 

@IBAction func addRowButton(sender: AnyObject) { 
    rowValue = rowValue + 1 
    rowCount.text = "\(rowValue)" 

    playAddSound() 
    motivateThem() 

} 

@IBOutlet weak var rowCount: UILabel! 


@IBAction func resetButton(sender: AnyObject) { 
    rowValue = 0 
    rowCount.text = "\(rowValue)" 
} 


@IBOutlet weak var soundSwitch: UISwitch! 

@IBAction func switchPressed(sender: UISwitch) { 

    if soundSwitch.on { 
     beepPlayer.volume = 0 

    } else { 
     beepPlayer.stop() 
    } 

} 

func motivateThem(){ 
    if(rowValue > 0 && rowValue < 2) 
    { 
     motivationLabel.text = motivationalQuotes[0] 
    } 
    else if(rowValue > 19) 
    { 
     motivationLabel.text = motivationalQuotes[8] 
    } 
} 

let addSoundURL = NSBundle.mainBundle().URLForResource("add", withExtension: "aif")! 
let subtractSoundURL = NSBundle.mainBundle().URLForResource("subtract", withExtension: "aif")! 
var beepPlayer = AVAudioPlayer() 

func playAddSound(){ 
    beepPlayer = AVAudioPlayer(contentsOfURL: addSoundURL, error: nil) 
    beepPlayer.prepareToPlay() 
    beepPlayer.play() 
} 

func playSubtractSound(){ 
    beepPlayer = AVAudioPlayer(contentsOfURL: subtractSoundURL, error: nil) 
    beepPlayer.prepareToPlay() 
    beepPlayer.play() 
} 

Answer 1

只是不發聲如果沒有必要。

if soundSwitch.on { playAddSound() }