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    <p>I would be careful calling <code>setValue</code> on an <code>MPVolumeView</code> since it probably won't do anything other than update the <em>appearance</em> of the slider, but not the actual device volume level. You would instead have to call <code>_commitVolumeChange</code> which is private API and will likely get your app rejected.</p> <p>A short answer to how to control volume: It really depends on what you're trying to control the volume of. </p> <p>If you want a "controls every sound within the app" sort of control then you can use an <code>MPVolumeView</code> but you <strong>cannot</strong> change it's value programmatically. You would then only be able to change the volume by either moving the slider with a touch or using the volume buttons on the side of the device. The best thing to do is create a global object that stores the volume level which any of your objects can read before they play their sound. </p> <p>If it's an <code>AVAudioPlayer</code> object, you'd create the object and use <code>[theAudioPlayerObject setVolume: someFloat];</code> where <code>someFloat</code> is a value between 0.0 and 1.0.</p> <p>If it's a <code>SystemSound</code> object, you can't control volume.</p> <p>If it's an <code>AudioQueue</code> you'd change it via <code>AudioQueueSetParameter</code></p> <p>Like I said.. it all depends on <em>how</em> you are playing the sound.</p> <p><strong>Update based on comment</strong></p> <p><a href="http://cocoawithlove.com/2008/09/streaming-and-playing-live-mp3-stream.html" rel="noreferrer">For that particular example</a>, you would set the volume like this:</p> <blockquote> <p>Add to the AudioStreamer.h file</p> </blockquote> <pre><code>- (void)setVolume:(float)Level; </code></pre> <blockquote> <p>Add to the AudioStreamer.m file</p> </blockquote> <pre><code>- (void)setVolume:(float)Level { OSStatus errorMsg = AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, Level); if (errorMsg) { NSLog(@"AudioQueueSetParameter returned %d when setting the volume.", errorMsg); } } </code></pre> <blockquote> <p>Add to the view controller for where the volume knob will be (this goes in the .m file.. i just did this as a couple UIButtons real quick, you'll have to do your own) and set up an IBAction to change the volume for a given value (you can pass in 0.0 thru 1.0 as a float)</p> </blockquote> <pre><code>- (IBAction)volumeUp:(id)sender { [streamer setVolume:1.0]; } - (IBAction)volumeDown:(id)sender { [streamer setVolume:0.0]; } </code></pre>
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    1. POChanging the volume without a volume slider on an iphone
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    1. COI want to control the volume of my app. I'm trying to make an app using matt gallagher classes on how to stream an mp3 source http://cocoawithlove.com/2008/09/streaming-and-playing-live-mp3-stream.html
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    2. COSee my updated answer
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    3. COThank you very much rob, I will try it :D I'm quite new to iphone programming :D thanks :D
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