获取多个AVAudioPlayerNodes的播放进度/时间

import AVFoundation

// 创建AVAudioEngine对象
let audioEngine = AVAudioEngine()

// 创建AVAudioPlayerNode对象
let playerNode1 = AVAudioPlayerNode()
let playerNode2 = AVAudioPlayerNode()

// 连接AVAudioPlayerNodes到AVAudioEngine
audioEngine.attach(playerNode1)
audioEngine.attach(playerNode2)

let mixer = audioEngine.mainMixerNode
audioEngine.connect(playerNode1, to: mixer, format: nil)
audioEngine.connect(playerNode2, to: mixer, format: nil)

// 启动AVAudioEngine
try? audioEngine.start()

// 监听AVAudioPlayerNodes的播放进度
let timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { _ in
    let currentTime1 = playerNode1.currentTime
    let currentTime2 = playerNode2.currentTime
    
    // 处理播放进度/时间，例如格式化为特定的时间格式
    let formattedTime1 = formatTime(currentTime1)
    let formattedTime2 = formatTime(currentTime2)
    
    print("Player 1: \(formattedTime1)")
    print("Player 2: \(formattedTime2)")
}

// 播放音频文件
let audioFileURL1 = Bundle.main.url(forResource: "audio1", withExtension: "mp3")!
let audioFileURL2 = Bundle.main.url(forResource: "audio2", withExtension: "mp3")!

let audioFile1 = try? AVAudioFile(forReading: audioFileURL1)
let audioFile2 = try? AVAudioFile(forReading: audioFileURL2)

playerNode1.scheduleFile(audioFile1, at: nil)
playerNode2.scheduleFile(audioFile2, at: nil)

playerNode1.play()
playerNode2.play()

// 格式化时间的辅助函数
func formatTime(_ time: TimeInterval) -> String {
    let minutes = Int(time / 60)
    let seconds = Int(time.truncatingRemainder(dividingBy: 60))
    return String(format: "%02d:%02d", minutes, seconds)
}