如何在AvAudioPlayerNode中循环Xcode10

Question

嗨，我正在用SpriteKit做一场SpriteKit游戏，决定用AvAudioPlayerNode和引擎代替常规的AvAudioPlayer，这样我就可以改变球场和回放速度，但是我遇到了一个问题，在比赛结束后AvAudioPlayerNode不会重复。

我已经使用了来自堆栈溢出的许多答案，但是它们非常过时，如果您确实解决了这个问题，可以确保它与我的代码一起工作，否则它是无用的。

//

let engine = AVAudioEngine()
let speedControl = AVAudioUnitVarispeed()
let pitchControl = AVAudioUnitTimePitch()
let audioplayer = AVAudioPlayerNode()
let audioPath = Bundle.main.path(forResource: "loop", ofType: "wav")


func play(_ url: URL) throws {

 let file = try AVAudioFile(forReading: url)



 engine.attach(audioplayer)
 engine.attach(pitchControl)
 engine.attach(speedControl)

 engine.connect(audioplayer, to: speedControl, format: nil)
 engine.connect(speedControl, to: pitchControl, format: nil)
 engine.connect(pitchControl, to: engine.mainMixerNode, format: nil)

 audioplayer.scheduleFile(file, at: nil)

 try engine.start()
 audioplayer.play()


}

‘

//此操作只需在游戏视图控制器中运行

let audioPath = Bundle.main.path(forResource: "loop", ofType: "wav") ?? ""

    do
    {

        try? play(URL(fileURLWithPath: audioPath))
    }
    catch {
}

实际上，我不知道从哪里开始，我对Xcode相当陌生，所以任何帮助都是有用的，请不要把我15岁的事情复杂化。

Answer 1

您希望将文件读入缓冲区，然后将播放机安排为循环。

let file = try AVAudioFile(forReading: url)
let audioFileBuffer = AVAudioPCMBuffer(PCMFormat: file.fileFormat, frameCapacity: file.length)
try? read(into buffer: audioFileBuffer )
audioFilePlayer.scheduleBuffer(audioFileBuffer, atTime: nil, options:.Loops, completionHandler: nil)
audioFilePlayer.play()