ipad - Changing the volume without a volume slider on an iphone

Question

I need your help. How should I proceed to change the sound volume in my app. I don't want to use a volume slider. Instead I have an UIImageView which is a volume knob, in which I rotate clockwise to increase, and anti clockwise to decrease the sound volume. The rotation is just an animation and I've already done that part.

I need your help and advice on how to increase/decrease the volume. Thanks

Answer 1

I view this as a bug in Apple's code and have reported it to them both with Bug Reports and in person, but since they insist its a feature, you might as well benefit from it.

Use the following code to change your application's volume:

[[MPMusicPlayerController applicationMusicPlayer] setVolume:newVolume];

This will only work after you have established your audio session, either by playing a sound or by setting it active as such:

[[AVAudioSession sharedInstance] setActive:YES error:NULL];

Note as that you'll need MediaPlayer.framework and AVFoundation.framework and that the volume is between 0.0 and 1.0.