iphone - NSData dataWithContentsOfFile 仪器 100% 泄漏

Question

已更新

为什么 NSData dataWithContentsOfFile 行在 Instruments 中显示泄漏？我正在使用 ARC。部署目标是 iOS 5.0

@autoreleasepool
{
    AudioPlayerAV *context = [userInfo valueForKey:@"self"];
    NSString *filepath = [userInfo valueForKey:@"filepath"];
    [context.player stop];

    //check if file is there fetch player from dict
    AVAudioPlayer *_player = nil;
    NSError *error = nil;
    NSData *filedata = [NSData dataWithContentsOfFile:filepath];

    _player = [[AVAudioPlayer alloc]initWithData:filedata error:&error]; 
    context.player = _player;
    NSLog(@"loadAndPlay error : %@",[error description]);
    context.player.numberOfLoops = (context.loop)?-1:0;
    context.player.volume = context.volume;
    [context.player play];
}

Answer 1

有时候，仪器会指向错误的线路，我认为是this泄漏 AVAudioPlayer .

来自: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.

You can see the AVAudioPlayer object then creates a C++ object AVAudioPlayerCpp, which retains the NSData again

Later, when the AVAudioPlayer object is released, the NSData is released, but there's never a release call from the associated AVAudioPlayerCpp... (You can tell from the attached image)

查看一下，answer 中附有一些仪器截图.