ios - 在 XCODE 8 Swift 3 中为倒数计时器添加音调

Question

我是编码新手。我正在尝试学习 iOS 开发，我创建了一个简单的倒数计时器，它使用 slider 来选择以秒为单位的时间量。我想为倒计时的最后 9 秒添加一个基调。我知道如何添加音频文件，但我“不知道”如何为计时器的最后 9 秒添加倒计时音。

@IBAction func startBtnTapped(_ sender: Any) {
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.counter), userInfo: nil, repeats: true)

    SoundPlayer4.play()

    //Hide Start and Slider Buttons
    startBtn.isHidden = true
    sliderCtrl.isHidden = true
    stopBtn.isHidden = false

}

@IBAction func stopBtnTapped(_ sender: Any) {
    timer.invalidate()
    seconds = 180
    sliderCtrl.setValue(180, animated: true)
    timerLbl.text = "180"

    SoundPlayer3.play()

    //Show Start and Slider Buttons
    sliderCtrl.isHidden = false
    startBtn.isHidden = false
    stopBtn.isHidden = true
}

@IBAction func sliderCrtlUsed(_ sender: UISlider) {
    seconds = Int(sender.value)
    timerLbl.text = String(seconds)
}

func counter(){
    seconds -= 1
    timerLbl.text = String(seconds)

    if (seconds == 0){
        timer.invalidate()

        //Show Start and Slider Buttons
        startBtn.isHidden = false
        sliderCtrl.isHidden = false
        stopBtn.isHidden = true

        //Play Audio
        SoundPlayer1.play()
    }
}

那么谁能帮我在我的项目中添加倒计时音调呢？谢谢

Answer 1

将此代码放入counter 函数中:

if seconds < 10 {

    var AudioURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Dog bark", ofType: "mp3")!)
    var AudioPlayer = AVAudioPlayer()

    do {       
        AudioPlayer = try AVAudioPlayer(contentsOfURL: AudioURL)
    } catch _ as NSError {
        fatalError()
    }

    AudioPlayer.play()
}

然后把文件放在这里:

就是这样!

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