Question

在这里，我曾经使用AVAudioPlayer Framework播放歌曲。希望它正在播放，但如果我点击Songslist中的其他歌曲，我会检查条件：

if(player.isPlaying == YES)
{
    [player stop];
    // And also i need to release or remove the existing NSDATA from the Player. otherwise the player won't release the existing data. So the memory pressure occurring in my project. 
}
self.audioPlayer = [self.audioPlayer initWithData:m_currentMusic.fileData error:&error];
[self.audioPlayer prepareToPlay];
[self.audioPlayer play];

Answer 1

AVAudioPlayer#data是一个只读的非保留属性。因此，数据不会被保留，您也无需将其重新发布（默认情况下为assigned）。

但是，正如我所说的那样，它是read-only所以如果你想改变曲目你就不能设置它。您也不应该在已初始化的对象上调用init...，如代码中所示：

self.audioPlayer=[self.audioPlayer initWithData:m_currentMusic.fileData error:&error];

我相信您想要的行动是让现有的self.audioPlayer重新制作并重新创建一个新行动，如下所示：

// stop player as in your original code...
[self.audioPlayer release];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithData:m_currentMusic.fileData error:&error];
self.audioPlayer = newPlayer;
[self.audioPlayer setDelegate:self];
[newPlayer release];

请注意，release会导致原始曲目data被回收（因为它未被保留）。

另见Core Audio Overview

如何从AVAudioPlayer释放NSDATA？

1 个答案: