我的程序有内存泄漏

-(IBAction)play2;

{
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef =CFBundleCopyResourceURL(mainBundle, 
                                             (CFStringRef) @"Bear3", CFSTR ("wav"), NULL);

    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
}

这给了我一个错误：

potential leak of an object allocated " CFBundleResourceURL
returns a Core Foundation object with a +1 retain count

音频服务创建系统声音ID http://developer.apple.com/library/ios/documentation/AudioToolbox/Reference/SystemSoundServicesReference/Reference/reference.html#//apple_ref/c/func/AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID); - 此处泄漏，因为创建添加了保留计数

use 音频服务DisposeSystemSoundID http://developer.apple.com/library/ios/documentation/AudioToolbox/Reference/SystemSoundServicesReference/Reference/reference.html#//apple_ref/c/func/AudioServicesDisposeSystemSoundID播放声音后