Sound playing notification on IPhone

When playing sound on IPhone using AVAudioPlyer, How to be notified when reaches certain time during the play开发者_如何学Pythoning?

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There is delegate method when AVAudioPlayer is finished successfully,

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag;

If you want to notify user when AVAudioPlayer reaches certain time, you can implement NSTimer using following method.

+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;