如何從AVAudioPlayer發佈NSDATA？

Question

在這裏，我曾經使用AVAudioPlayer Framework播放歌曲。但願這是玩，但如果我在其他歌曲點擊來自Songslist我將檢查條件：

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是隻讀的非保留財產。因此，數據不會被保留，您也不需要將其解除（默認爲assigned）。

但是，正如我所說，它是read-only所以你不能設置它，如果你想改變軌道。你也應該不是已initialied對象調用init...，如代碼：

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

我相信你想要的東西預期的行動是relesae現有self.audioPlayer並重新創建一個新的，如下：

// 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]; 

注意，release會導致你原來的軌道data要回收的（因爲它的非保留）。

也Core Audio Overview