Question

我初始化一个ivar AVAudioPlayer变量，播放并试图释放它的内存。在释放线之后，它不会设置为0x0。在零行之后，它不会变为0x0。 AVAudioPlayer是否需要特殊的东西来释放它的内存？

audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource: @"mysound" ofType: @"aif" inDirectory:@"/"]] error: &err];
audioPlayer.numberOfLoops = 0;
audioPlayer.volume = .5;
[audioPlayer prepareToPlay];
[audioPlayer play];
[audioPlayer release];
audioPlayer = nil;

Answer 1

那么，

AVAudioPLayer异步播放音频文件。您不应该在开始播放后释放播放器，这可能会导致一些与内存相关的错误，并且您的音频文件也可能无法播放。

您应该通过avaudioplayerdelegate释放播放器。有关详细信息，请查看此answer too。

希望这有帮助。

谢谢，

Madhup

Answer 2

 - (IBAction) playaction {

        NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:@"songname" ofType:@"mp3"];
        NSURL *newURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
        self.soundFileURL = newURL;
        [newURL release];
        [[AVAudioSession sharedInstance] setDelegate: self];
        [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil];

    // Registers the audio route change listener callback function
    AudioSessionAddPropertyListener (
                                     kAudioSessionProperty_AudioRouteChange,
                                     audioRouteChangeListenerCallback,
                                     self
                                     );

    // Activates the audio session.

    NSError *activationError = nil;
    [[AVAudioSession sharedInstance] setActive: YES error: &activationError];

    AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: soundFileURL error: nil];
    self.appSoundPlayer = newPlayer;
    [newPlayer release];
    [appSoundPlayer prepareToPlay];
    [appSoundPlayer setVolume: 1.0];
    [appSoundPlayer setDelegate: self];
    [appSoundPlayer play];

}

这里，appSoundPlayer在头文件中声明为

AVAudioPlayer *appSoundPlayer;

它是声明和合成的属性，也以dealloc方法发布为

[appSoundPlayer release];

AVAudioPlayer不释放内存

2 个答案: