Swift Spritekit：背景音乐没有播放

2 回答

• 2

  我认为它不会播放的原因是因为一旦场景改变，音频节点将被释放 . 我不确定为什么它只在转换之间进行 . 我也从未使用过音频节点，但我确实创建了自己的自定义类来处理所有音频 .

  另外，我不会复制和粘贴代码 . 当你只有一个类来处理音频时，你在两个场景中都有相同的代码 . 这是一个使用我制作的名为JKAudioPlayer的自定义类的解决方案 . 只需创建一个新的Swift类并将代码粘贴到其中 . 由于稍后声明的音频对象不是场景的一部分，因此在转换时它将继续/允许播放音乐 .

  import Foundation
  import SpriteKit
  import AVFoundation
  import AVFoundation.AVAudioSession
  
  /**Manages a shared instance of JKAudioPlayer.*/
  private let JKAudioInstance = JKAudioPlayer()
  
  /**Provides an easy way to play sounds and music. Use sharedInstance method to access a single object for the entire game to manage the sound and music.*/
  public class JKAudioPlayer {
  
      /**Used to access music.*/
      var musicPlayer: AVAudioPlayer!
  
      /** Allows the audio to be shared with other music (such as music being played from your music app). If this setting is false, music you play from your music player will stop when this app's music starts. Default set by Apple is false. */
      static var canShareAudio = false {
          didSet {
              canShareAudio ? try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient) : try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategorySoloAmbient)
          }
      }
  
      /**Creates an instance of the JAAudio class so the user doesn't have to make their own instance and allows use of the functions. */
      public class func sharedInstance() -> JKAudioPlayer {
          return JKAudioInstance
      }
  
  /**Plays music. You can ignore the "type" property if you include the full name with extension in the "filename" property. Set "canShareAudio" to true if you want other music to be able to play at the same time (default by Apple is false).*/
      public func playMusic(fileName: String, withExtension type: String = "") {
          if let url = NSBundle.mainBundle().URLForResource(fileName, withExtension: type) {
              musicPlayer = try? AVAudioPlayer(contentsOfURL: url)
              musicPlayer.numberOfLoops = -1
              musicPlayer.prepareToPlay()
              musicPlayer.play()
          }
      }
  
      /**Stops the music. Use the "resumeMusic" method to turn it back on. */
      public func stopMusic() {
          if musicPlayer != nil && musicPlayer!.playing {
              musicPlayer.currentTime = 0
              musicPlayer.stop()
          }
      }
  
      /**Pauses the music. Use the "resumeMusic" method to turn it back on. */
      public func pauseMusic() {
          if musicPlayer != nil && musicPlayer!.playing {
              musicPlayer.pause()
          }
      }
  
      /**Resumes the music after being stopped or paused. */
      public func resumeMusic() {
          if musicPlayer != nil && !musicPlayer!.playing {
              musicPlayer.play()
          }
      }
  
      /**Plays a sound only once. Must be used inside a runAction(...) method.*/
      public func playSound(fileName: String) -> SKAction? {
          return SKAction.playSoundFileNamed(fileName, waitForCompletion: false)
      }
  }
  

  要使用它，请创建一个可以访问音频的全局变量 .

  let audio = JKAudioPlayer.sharedInstance()
  

  然后，当您想要播放音乐时，可以在场景类的didMoveToView函数中轻松调用它 .

  audio.playMusic("MusicName")
  

  您还可以通过调用暂停/停止/恢复音乐功能来控制它，如下所示：

  audio.stopMusic()
  

  如果您希望用户能够在后台播放自己的音乐，例如从他们的iTunes资料库中播放他们的音乐，那么您可以在GameViewController的viewDidLoad函数中将canShareAudio设置为true .

  audio.canShareAudio = true
  

  回复于 2024-05-03T15:26:37+08:00
• 0

  这里是测试和工作的Swift 3的代码你需要将文件的扩展名放在最后，否则它将无法找到声音文件

  在一个新的Swift文件中复制和粘贴

  import Foundation
  import SpriteKit
  import AVFoundation
  
      public let audio = JKAudioPlayer.sharedInstance()
  
  
      private let JKAudioInstance = JKAudioPlayer()
  
  
      public class JKAudioPlayer {
  
  
      var musicPlayer: AVAudioPlayer!
  
  
      static var canShareAudio = false {
          didSet {
          canShareAudio ? try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient) : try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategorySoloAmbient)
          }
      }
  
      public class func sharedInstance() -> JKAudioPlayer {
          return JKAudioInstance
      }
      public func playMusic(fileName: String, withExtension type: String = "") {
          if let url = Bundle.main.url(forResource: fileName, withExtension: type) {
              musicPlayer = try? AVAudioPlayer(contentsOf: url)
              musicPlayer.numberOfLoops = -1
              musicPlayer.prepareToPlay()
              musicPlayer.play()
          }
      }
  
  
      public func stopMusic() {
          if musicPlayer != nil && musicPlayer!.isPlaying {
              musicPlayer.currentTime = 0
              musicPlayer.stop()
          }
      }
  
  
      public func pauseMusic() {
          if musicPlayer != nil && musicPlayer!.isPlaying {
              musicPlayer.pause()
          }
      }
  
      public func resumeMusic() {
          if musicPlayer != nil && !musicPlayer!.isPlaying {
              musicPlayer.play()
          }
      }
  
      public func playSound(fileName: String) -> SKAction? {
          return SKAction.playSoundFileNamed(fileName, waitForCompletion: false)
      }
  }
  

  播放任何文件只是简单地插入

  audio.playMusic(fileName: "NameOfFile")
  

  并停止音乐只是放在你需要停止的地方

  audio.stopMusic()
  

  回复于 2024-05-03T15:26:37+08:00