AVAudioPlayer Swift 3不播放聲音

Question

我將AVFoundation.framework添加到了我的項目中。在我的項目導航器中，我添加了文件「Horn.mp3」，這是一秒鐘的聲音。

當按下按鈕（帶有喇叭圖像）時，聲音應該播放，標籤也應該改變它的文本。

該標籤正在改變它的文本，但聲音沒有播放。

這是我的代碼：

import UIKit 
import AVFoundation 

class ViewController: UIViewController { 

    @IBAction func hornButtonPressed(_ sender: Any) { 
     playSound() 
     hornLabel.text = "Toet!!!" 
    } 

    @IBOutlet weak var hornLabel: UILabel! 

    func playSound(){ 
     var player: AVAudioPlayer? 
     let sound = Bundle.main.url(forResource: "Horn", withExtension: "mp3") 
     do { 
      player = try AVAudioPlayer(contentsOf: sound!) 
      guard let player = player else { return } 
      player.prepareToPlay() 
      player.play() 
     } catch let error { 
      print(error.localizedDescription) 
     } 

    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


} 

Answer 1

你需要移動AVPlayer的聲明類級別。 AVPlayer當您在方法中聲明它們時，無法播放聲音。

class ViewController: UIViewController { 
    var player: AVAudioPlayer? // <-- notice here 

    @IBAction func hornButtonPressed(_ sender: Any) { 
     playSound() 
     hornLabel.text = "Toet!!!" 
    } 

    @IBOutlet weak var hornLabel: UILabel! 

    func playSound(){ 
     let sound = Bundle.main.url(forResource: "Horn", withExtension: "mp3") 
     do { 
      player = try AVAudioPlayer(contentsOf: sound!) 
      guard let player = player else { return } 
      player.prepareToPlay() 
      player.play() 
     } catch let error { 
      print(error.localizedDescription) 
     } 

    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


}