Getting iOS device volume

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Hi,

I am trying to figure out a way to retrieve the current volume from an iOS device. I don't need to change it...just retrieve it. I thought about using a plugin for this, but I don't really want to poll the device, but rather have the device fire an event that talks back to Unity via the UnitySendMessage callback.

I found the following code bits while researching the issue, but I can't seem to get them to work properly as I really have no idea where they are supposed to go.

 // Volume control notification
     
     [[NSNotificationCenter defaultCenter]
      addObserver:self
      selector:@selector(volumeChanged:)
      name:@"AVSystemController_SystemVolumeDidChangeNotification"
      object:nil];


 - (void) volumeChanged:(NSNotification *) notification
 {
     float volume = [[[notification userInfo]
                     objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"]
                     floatValue];
     
     NSString *volString = [NSString stringWithFormat: @"%f",volume];
     const char* volChar = [volString UTF8String];
     UnitySendMessage("AudioManager","OnVolumeChanged",volChar);
 }

I have tried putting the event registration in various places around the AppController.mm, but it never seems to fire the actual event. My Obj-C is very weak, so I'm sure I'm doing something blatantly wrong. Anybody have any suggestions?

Answer 1

Answer by agamedesigner · Aug 03, 2012 at 08:13 PM

I think this might help: http://stackoverflow.com/questions/7207417/how-to-detect-an-iphone-ipod-volume-level

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chrisjjones · Aug 03, 2012 at 08:22 PM 0

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I did run across this in my search and this would be an alternate way of getting the device volume (there were several I found), but how do I tie that into an event that is fired when someone actively changes the volume on the device?

agamedesigner · Aug 03, 2012 at 08:37 PM 0

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how about this: http://stackoverflow.com/questions/6164471/listen-to-a-value-change-of-my-text-field

chrisjjones · Aug 03, 2012 at 09:57 PM 0

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I think I already have that part of it down. I did add the following right above my notification registration code, but it didn't seem to make a difference, which I put in the startUnity function.

AudioSessionInitialize(NULL, NULL, NULL, NULL); AudioSessionSetActive(true);

http://stackoverflow.com/questions/7749030/objective-c-volumechanged-wasnt-called-even-add-a-observer-for-avsystemcontrol

Getting iOS device volume

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