iPhone开发中使用AVAudioPlayer出现内存泄漏的解决办法

 

最近在使用AVAudioPlayer播放音频时，发现有内存泄漏的现象，我的代码如下：

-(id)init
{
    if (self = [super init]) {
        NSString *path = [[NSBundle mainBundle] pathForResource:@"GameOver" ofType:@"mp3"];
        NSError *error = nil;
        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:&error];
        audioPlayer.delegate = self;
        [audioPlayer prepareToPlay];
        audioPlayer.numberOfLoops = -1;
        [audioPlayer play];
    }
    
    return self;
}

 

-(void)dealloc
{
    if (audioPlayer && [audioPlayer isPlaying]) {
        [audioPlayer stop];
    }
    
    [audioPlayer release];
    audioPlayer = nil;
    [super dealloc];
}

 

跟踪Instruments工具中的泄漏情况，发现都是在NSURL或NSData泄漏了，在stackoverflow发现有人这么说（帖子：http://stackoverflow.com/questions/12498015/leak-from-nsurl-and-avaudioplayer-using-arc）：

Looks to be a leak in Apple's code... I tried using both

• -[AVAudioPlayer initWithData:error:] and
• -[AVAudioPlayer initWithContentsOfURL:error:]

In the first case, the allocated AVAudioPlayer instance retains the passed in NSData. In the second, the passed in NSURL is retained:

也就是说使用AVAudioPlayer播放音频时，NSData或NSURL被retain了，所以，我在dealloc方法中将其release，内存泄漏就解决了：

-(void)dealloc
{
    [audioPlayer.url release];
    
    if (audioPlayer && [audioPlayer isPlaying]) {
        [audioPlayer stop];
    }
    
    [audioPlayer release];
    audioPlayer = nil;
    [super dealloc];
}