当插入/关闭耳机时，SKAudioNode()崩溃

Question

我正在使用SKAudioNode()在我的游戏中播放背景音乐。我有一个播放/暂停功能，一切正常工作，直到我插入我的耳机。根本没有声音，当我调用暂停/播放函数时，我会得到这个错误

AVAudioPlayerNode.mm:333: Start: required条件为false：_engine->IsRunning() com.apple.coreaudo.avf音频‘，原因是：’必需条件为false：_engine->IsRunning()

有人知道这意味着什么吗？

代码：

import SpriteKit

class GameScene: SKScene {

let loop = SKAudioNode(fileNamed: "gameloop.mp3")
let play = SKAction.play()
let pause = SKAction.pause()
var isPlaying = Bool()

override func didMoveToView(view: SKView) {  
    loop.runAction(play)
    isPlaying = true
    self.addChild(loop)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    _ = touches.first as UITouch!

    for _ in touches {
        if isPlaying {
            loop.runAction(pause)
            isPlaying = false
        } else {
            loop.runAction(play)
            isPlaying = true
        } 
    }
}
}

Answer 1

我无法修复它，但是通过使用AVAudioPlayer()，我找到了一个很好的解决方法。谢谢大家支持我！

import SpriteKit
import AVFoundation

class GameScene: SKScene {    
    var audioPlayer = AVAudioPlayer()  

    override func didMoveToView(view: SKView) {        
        initAudioPlayer("gameloop.mp3")        
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {        
        _ = touches.first as UITouch!
        for _ in touches {
            toggleBackgroundMusic()            
        }        
    }

    func initAudioPlayer(filename: String) {        
        let url = NSBundle.mainBundle().URLForResource(filename, withExtension: nil)
        guard let newURL = url else {
            print("Could not find file: \(filename)")
            return
        }
        do {
            audioPlayer = try AVAudioPlayer(contentsOfURL: newURL)
            audioPlayer.numberOfLoops = -1
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        } catch let error as NSError {
            print(error.description)
        }        
    }

    func toggleBackgroundMusic() {        
        if audioPlayer.playing {
            audioPlayer.pause()
        } else {
            audioPlayer.play()
        }        
    }    
}

Answer 2

SKScene有一个名为audioEngine的属性，在某些情况下会停止。例如，如果您使用的是RPPreviewController ReplayKit，在hi-中播放一部录制好的游戏电影，然后停止播放，所以当您将其排除在外时，audioEngine就不再运行了。

我遇到了这个问题，并通过简单的检查并再次启动audioEngine来解决它。试试这个：

if !self.audioEngine.isRunning {
    do {
        try self.audioEngine.start()
    } catch {
        //handle error
    }
}