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

问题描述

为什么下面的代码没有声音?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);

如果我改用下面的代码，我可以听到声音.

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

问题在于 Player，你的 AVAudioPlayer，是一个局部变量.所以它会立即消失 - 甚至可以开始播放，更不用说完成播放了.

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:改为将其设为属性，以便它持久化.

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

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