AVAudioPlayer.play() does not play sound

问题

Why doesn't the following code play a sound? It returns "true" for play(), but I cannot hear anything.

    let path = "/Users/account/Music/sound.mp3";
    let fileURL = NSURL(fileURLWithPath: path)
    var Player = AVAudioPlayer(contentsOfURL:fileURL, error:nil);

    Player.delegate = self;
    Player.prepareToPlay();
    Player.volume = 1.0;
    var res = Player.play();
    println(res);

If I use the following code instead, I can hear the sound.

    var inFileURL:CFURL = fileURL!;
    var mySound = UnsafeMutablePointer<SystemSoundID>.alloc(sizeof(SystemSoundID));
    AudioServicesCreateSystemSoundID(inFileURL, mySound);
    AudioServicesPlaySystemSound(mySound.memory)

• OS X Yosemite 10.10.3
• Xcode 6.2

回答1:

The problem is that Player, your AVAudioPlayer, is a local variable. So it goes out of existence immediately - before it can even start playing, let alone finish playing.

Solution: make it a property instead, so that it will persist.

来源：https://stackoverflow.com/questions/29379524/avaudioplayer-play-does-not-play-sound