ios - 获取 AVAudioPlayer 一次播放多种声音

Question

我试图让多个声音文件在 AVAudioPlayer 实例上播放，但是当一个声音播放时，另一个停止。我一次只能播放一种声音。这是我的代码:

import AVFoundation

class GSAudio{

    static var instance: GSAudio!

    var soundFileNameURL: NSURL = NSURL()
    var soundFileName = ""
    var soundPlay = AVAudioPlayer()

    func playSound (soundFile: String){

        GSAudio.instance = self

        soundFileName = soundFile
        soundFileNameURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(soundFileName, ofType: "aif", inDirectory:"Sounds")!)
        do{
            try soundPlay = AVAudioPlayer(contentsOfURL: soundFileNameURL)
        } catch {
            print("Could not play sound file!")
        }

        soundPlay.prepareToPlay()
        soundPlay.play ()
    }
}

任何人都可以告诉我如何同时播放多个声音文件来帮助我吗？任何帮助深表感谢。

非常感谢，凯

Answer 1

音频停止的原因是因为您只设置了一个 AVAudioPlayer，所以当您要求类播放另一种声音时，您当前正在用 AVAudioPlayer 的新实例替换旧实例。你基本上是在覆盖它。

您可以创建 GSAudio 类的两个实例，然后在每个实例上调用 playSound，或者使该类成为使用 audioPlayers 字典的通用音频管理器。

我更喜欢后一种选择，因为它允许更简洁的代码并且也更高效。你可以检查一下你之前是否已经为声音制作了一个播放器，而不是制作一个新的播放器。

无论如何，我为您重新制作了您的类，以便它可以同时播放多种声音。它还可以在自身上播放相同的声音(它不会替换之前的声音实例)希望对您有所帮助!

该类是单例，因此要访问该类，请使用:

GSAudio.sharedInstance

例如，要播放您会调用的声音:

GSAudio.sharedInstance.playSound("AudioFileName")

同时播放多个声音:

GSAudio.sharedInstance.playSounds("AudioFileName1", "AudioFileName2")

或者您可以在某处的数组中加载声音并调用接受数组的 playSounds 函数:

let sounds = ["AudioFileName1", "AudioFileName2"]
GSAudio.sharedInstance.playSounds(sounds)

我还添加了一个 playSounds 函数，允许您延迟以级联格式播放的每个声音。所以:

 let soundFileNames = ["SoundFileName1", "SoundFileName2", "SoundFileName3"]
 GSAudio.sharedInstance.playSounds(soundFileNames, withDelay: 1.0)

会在 sound1 之后播放 sound2，然后 sound3 会在 sound2 之后播放一秒钟，依此类推。

这是类:

class GSAudio: NSObject, AVAudioPlayerDelegate {

    static let sharedInstance = GSAudio()

    private override init() {}

    var players = [NSURL:AVAudioPlayer]()
    var duplicatePlayers = [AVAudioPlayer]()

    func playSound (soundFileName: String){

        let soundFileNameURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(soundFileName, ofType: "aif", inDirectory:"Sounds")!)

        if let player = players[soundFileNameURL] { //player for sound has been found

            if player.playing == false { //player is not in use, so use that one
                player.prepareToPlay()
                player.play()

            } else { // player is in use, create a new, duplicate, player and use that instead

                let duplicatePlayer = try! AVAudioPlayer(contentsOfURL: soundFileNameURL)
                //use 'try!' because we know the URL worked before.

                duplicatePlayer.delegate = self
                //assign delegate for duplicatePlayer so delegate can remove the duplicate once it's stopped playing

                duplicatePlayers.append(duplicatePlayer)
                //add duplicate to array so it doesn't get removed from memory before finishing

                duplicatePlayer.prepareToPlay()
                duplicatePlayer.play()

            }
        } else { //player has not been found, create a new player with the URL if possible
            do{
                let player = try AVAudioPlayer(contentsOfURL: soundFileNameURL)
                players[soundFileNameURL] = player
                player.prepareToPlay()
                player.play()
            } catch {
                print("Could not play sound file!")
            }
        }
    }


    func playSounds(soundFileNames: [String]){

        for soundFileName in soundFileNames {
            playSound(soundFileName)
        }
    }

    func playSounds(soundFileNames: String...){
        for soundFileName in soundFileNames {
            playSound(soundFileName)
        }
    }

    func playSounds(soundFileNames: [String], withDelay: Double) { //withDelay is in seconds
        for (index, soundFileName) in soundFileNames.enumerate() {
            let delay = withDelay*Double(index)
            let _ = NSTimer.scheduledTimerWithTimeInterval(delay, target: self, selector: #selector(playSoundNotification(_:)), userInfo: ["fileName":soundFileName], repeats: false)
        }
    }

     func playSoundNotification(notification: NSNotification) {
        if let soundFileName = notification.userInfo?["fileName"] as? String {
             playSound(soundFileName)
         }
     }

     func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
        duplicatePlayers.removeAtIndex(duplicatePlayers.indexOf(player)!)
        //Remove the duplicate player once it is done
    }

}