AVAudioPlayer.play()不播放声音 [英] AVAudioPlayer.play() does not play sound

问题描述

以下代码为什么不播放声音?它为play()返回"true"，但我听不到任何声音.

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);

如果我改用以下代码，则可以听到声音.

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优胜美地10.10.3
• Xcode 6.2

推荐答案

问题是Player(您的AVAudioPlayer)是局部变量.因此，它会立即消失-在开始播放之前，更不用说结束播放了.

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.

解决方案:改为使用属性，这样它就会持久.

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

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