Swift：如何在更改視圖時停止背景音樂

Question

我試圖在更改爲另一個視圖時讓背景音樂停止播放。

我有一個全局變量來播放音樂

import Foundation 
import AVFoundation 

class MusicHelper { 
    static let sharedHelper = MusicHelper() 
    var audioPlayer: AVAudioPlayer? 

    func playBackgroundMusic() { 
     let aSound = NSURL(fileURLWithPath: Bundle.main.path(forResource: "The Walking Dead", ofType: "mp3")!) 
     do { 
      audioPlayer = try AVAudioPlayer(contentsOf:aSound as URL) 
      audioPlayer!.numberOfLoops = -1 
      audioPlayer!.prepareToPlay() 
      audioPlayer!.play() 
     } catch { 
      print("Cannot play the file") 
     } 
    } 
} 

然後我音樂加載到視圖這裏

import UIKit 
import SwiftGifOrigin 
import AVFoundation 

class ViewController: UIViewController { 
    var audioPlayer: AVAudioPlayer? 

    @IBOutlet weak var introGif: UIImageView! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     // Gif intro 
     self.introGif.image = UIImage.gifWithName("WalkingDeadIntro") 

     _ = try! Data(contentsOf: Bundle.main.url(forResource: "WalkingDeadIntro", withExtension: "gif")!) 
     //self.bottomImageView.image = UIImage.gif(data: imageData) 

     // Load background Music 
     MusicHelper.sharedHelper.playBackgroundMusic() 
    } 

Answer 1

只要寫下面的代碼停止時提供的視圖更改玩家正如你所提到的，audioPlayer是一個全局變量。

override func viewWillDisappear() { 
audioPlayer.stop() 
}