IOS：当我返回视图时停止音频
当我从视图中退出时，我会启动一首顺口溜，当我返回此视图时，我想停止此顺口溜（wma），
当我在 IbAction 中退出时，我有以下代码：
NSString *path = [NSString stringWithFormat:@"%@/%@",
[[NSBundle mainBundle] resourcePath],
@"file.wav"];
NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO];
AudioServicesCreateSystemSoundID((CFURLRef)filePath, &soundID);
AudioServicesPlaySystemSound(soundID);
但是当我返回视图时，我尝试在 viewWillAppear 中写入，
AudioServicesRemoveSystemSoundCompletion(soundID);
AudioServicesDisposeSystemSoundID(soundID);
但是它不起作用，你能帮我吗？
When I exit from a view I start a jingle and when i return in this view I want to stop this jingle (wma)
when I exit in IbAction I have this code:
NSString *path = [NSString stringWithFormat:@"%@/%@",
[[NSBundle mainBundle] resourcePath],
@"file.wav"];
NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO];
AudioServicesCreateSystemSoundID((CFURLRef)filePath, &soundID);
AudioServicesPlaySystemSound(soundID);
but when I return in the view I try to write in viewWillAppear
AudioServicesRemoveSystemSoundCompletion(soundID);
AudioServicesDisposeSystemSoundID(soundID);
but it don't work, can you help me?
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viewWillAppear：在某些情况下不会被调用。您可以使用通知中心（[NSNotificationCenter defaultCenter]）或委托让您立即查看何时停止音乐。有一些方法，例如
postNotification:和addObserver:，检查它们。viewWillAppear:not will be called in some cases. You can use notification center ([NSNotificationCenter defaultCenter]) or delegate to let your view now when to stop music.There are some methods like
postNotification:andaddObserver:, check them.