iPhone SDK 4 - How to programmatically detect volume hardware button press?

问题

How would you detect if the user presses the volume hardware buttons and prevent default behaviour?

Thanks a lot.

回答1:

Look at AVSystemController_SystemVolumeDidChangeNotification (or alternatively here)

来源：https://stackoverflow.com/questions/3722239/iphone-sdk-4-how-to-programmatically-detect-volume-hardware-button-press