iphone - 保留从 4 开始的计数

Question

在以下代码中

 NSURL *file = [[NSURL alloc] initFileURLWithPath: [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:soundName]];
     //        NSData *data = [NSData dataWithContentsOfURL:file];
     myExampleSound1 =[[AVAudioPlayer alloc] initWithContentsOfURL:file error:nil];
     myExampleSound1.volume=0.9;
     [myExampleSound1 prepareToPlay];
     myExampleSound1.delegate = self;
     [myExampleSound1 play];
     [soundsArray addObject:myExampleSound1];

     NSLog(@"RETAIN COUNT BEFORE RELEASE file = %d, myExampleSound1=%d, soundsArray=%d", [file retainCount],[myExampleSound1 retainCount], [soundsArray retainCount]);
     [file release];
     NSLog(@"RETAIN COUNT AFTER RELEASE file = %d, myExampleSound1=%d, soundsArray=%d", [file retainCount],[myExampleSound1 retainCount], [soundsArray retainCount]);

我正在打印文件的保留计数在发布前为 4，在发布后为 3。提前致谢