为什么我在某些app里看到有推送是否震动的选项，但是在 iOS Developer Library 里看到的却是震动是程序不可控的，必须由用户决定？
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You can explicitly invoke vibration on an iPhone by using the kSystemSoundID_Vibrate constant when you call the AudioServicesPlaySystemSound function.
https://developer.apple.com/library/ios/documentation/MusicAudio/Conceptual/CoreAudioOverview/CoreAudioEssentials/CoreAudioEssentials.html