问题
I\'ve seen techniques to make sure that an app respects the mute switch, but is it possible to set the iPhone to mute (no sounds from any apps) using the SDK?
回答1:
No.
Applications developed using the official SDK cannot change (and in most cases cannot even access) system-wide settings.
回答2:
It is possible, but only using private API's. I only went as far as muting the ringer, but you should be able to control the master level as well.
See How to disable iOS System Sounds
回答3:
It is technically possible to change the system volume through the private AVSystemController class in Celestial.framework, but will prevent your app from getting Apple's approval
回答4:
As only one app can be running at a time, the only possible use I can think of for this would be to mute other people's apps, and it should be fairly clear why Apple prevents that.
What would I do if an app muted the iPhone and I didn't know it happened? It can't physically move the mute switch on the side of the phone, so that wouldn't match, and I'd have to figure out a) that the phone was muted and b) how to unmute it without the switch.
回答5:
I can change volume using AVSystemController, it sets to minimum which is 0.06x. Is there class/API to mute it completely? toggleActiveCategoryMuted does not work
来源：https://stackoverflow.com/questions/596862/is-it-possible-to-programmatically-mute-the-iphone