For the iPad or iPhone, how do you control the system Volume? For example, have a button that mutes all audio

I would like to make a button in my iPad app (probably will be similar to iPhone apps) that when I push this button, all audio is muted, even when you exit the app.

I don't see anyway that you can control the volume, although I'm sure other开发者_开发百科 apps have that I have seen in the app store for the iPhone. I also read some places that doing this would reject you from the app store.

How could I go about lowering, or highering the volume of the iPad from an app that works even when the app closes?

Thank you!

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AFAIK, you can't, at least not programmatically. But you can integrate an MPVolumeView.

Using a UISlider to change volume

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You can't do this. Apple does not let you make system-wide changes that affect other apps like this.