Swift：声音在模拟器上播放，但不在设备上播放

Question

我正在为 iPhone/iPad 构建一个应用程序，我正在尝试解决一个声音问题：

该应用程序带有一个四分钟的倒数计时器。当倒计时到 00:00 时，会触发一个简短的音效。这在不同的模拟器上运行良好，但我的手机保持静音。该应用程序是为 7.1 构建的。我想知道是因为代码还是我的手机不工作（它确实有声音问题）。我的代码看起来好吗？我希望有人可以帮助解决这个问题。

这里是：

import Foundation
import UIKit
import AVFoundation


class VC11 : UIViewController {


    @IBOutlet weak var timerLabel: UILabel!



    var timer = NSTimer()
    var count = 240
    var timerRunning = false
    var audioPlayer = AVAudioPlayer()


    override func viewDidLoad() {
        super.viewDidLoad()


            func nextPage(sender:UISwipeGestureRecognizer) {
                switch sender.direction {

                case UISwipeGestureRecognizerDirection.Left:
                    print("SWIPED LEFT")
                    self.performSegueWithIdentifier("seg11", sender: nil)
                default:
                    break

                }


                var leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
                var rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))

                leftSwipe.direction = .Left
                rightSwipe.direction = .Right

                view.addGestureRecognizer(leftSwipe)
                view.addGestureRecognizer(rightSwipe)
            }


        }



    func updateTime() {
        count--

            let seconds = count % 60
            let minutes = (count / 60) % 60
            let hours = count / 3600
            let strHours = hours > 9 ? String(hours) : "0" + String(hours)
            let strMinutes = minutes > 9 ? String(minutes) : "0" + String(minutes)
            let strSeconds = seconds > 9 ? String(seconds) : "0" + String(seconds)
            if hours > 0 {
                timerLabel.text = "\(strHours):\(strMinutes):\(strSeconds)"
            }
            else {
                timerLabel.text = "\(strMinutes):\(strSeconds)"

        }
        stopTimer()


           }
  @IBAction func startTimer(sender: AnyObject) {
    timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true)

    sender.setTitle("Running...", forState: .Normal)

       }


    func stopTimer()

    {

        if count == 0 {
            timer.invalidate()
            timerRunning = false
            timerLabel.text = "04:00"
            playSound()
            count = 240

        }


    }




    func playSound() {

    var soundPath = NSBundle.mainBundle().pathForResource("Metal_Gong", ofType: "wav")
    var soundURL = NSURL.fileURLWithPath(soundPath!)


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


}

Answer 1

确保您的设备没有被触发进入静音模式。

此外，对于简短的系统声音，您可以使用 AudioToolbox 中的系统声音（https://developer.apple.com/library/ios/documentation/AudioToolbox/Reference/SystemSoundServicesReference/）：

if let soundURL = NSBundle.mainBundle().URLForResource("Metal_Gong", withExtension: "wav") {
    var mySound: SystemSoundID = 0
    AudioServicesCreateSystemSoundID(soundURL, &mySound)
    AudioServicesPlaySystemSound(mySound);
}