How long does AudioServicesPlaySystemSound(kSystemSoundID_Vibrate) last?

StackOverflow https://stackoverflow.com/questions/3338006

문제

I don't have access an iPhone to test on right now. Can anyone tell me how long this call makes the phone vibrate? Thanks.

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해결책

This article at http://www.kimballlarsen.com/2009/12/22/how-to-make-iphone-vibrate-for-a-long-time/ states that:

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate) API call will produce exactly 0.4 seconds of vibration and 0.1 seconds of silence.

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