Check if iPad is in silent mode [duplicate]

Answer 1

This SO answer answers it nicely:

Detect Silent mode in iOS5?

And regarding Gabe's answer, if his answer does indeed use a private API, Apple will reject your app.

Answer 2

In your XIB you can add a slider to check what the volume level is at, so basically you can tell if it is silent, and know the level of the volume. For more understanding of this class, here's the link http://blog.stormyprods.com/2008/09/proper-usage-of-mpvolumeview-class.html but try this first:

The following code will create something like a volume bar.

- (void)viewDidLoad {
        // create a frame for MPVolumeView image
 CGRect frame = volumeViewHolder.bounds; // CGRectMake(0, 5, 180, 0);
 volumeView = [[[MPVolumeView alloc] initWithFrame:frame] autorelease];
 [volumeView sizeToFit];
 [volumeViewHolder addSubview:volumeView];

 for (UIView *view in [volumeView subviews]){
  if ([[[view class] description] isEqualToString:@"MPVolumeSlider"]) {
   volumeViewSlider = view;
  }
 }
 [[NSNotificationCenter defaultCenter] addObserver:self 
      selector:@selector(volumeChanged:) 
      name:@"AVSystemController_SystemVolumeDidChangeNotification" 
      object:nil];
}
- (void) volumeChanged:(NSNotification *)notify
{
[volumeViewSlider setValue:[[[notify userInfo] objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"] floatValue]];
}

I heard that for some reason apple doesn't allow you to sell an app if you use a certain class (the one in my example) but I'm not too sure about this, I would double-check and make sure that you are 'allowed' to use it. But the code should work.