AVAudioSessionCategory not working with Microphone

Hello.

I'm building a media-focused app with Unity. As per the Apple guidelines (https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/Sound.html), sound is essential to the app, so I am trying to change the AVAudioSession category so that my app plays sound even when in 'silent' mode.

I am able to hook into the view controller, and get it working with this:

Code (CSharp):

1. - (void)viewWillAppear:(NSNotification*)notification
2. {
3.     AVAudioSession *audioSession = [AVAudioSession sharedInstance];
4.     [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
5. }

However, as soon as I use the Unity Microphone to record audio, the above setCategory seems to be invalidated, and my app once again goes into silent mode until I disable the 'silent' switch.

Is the Unity Microphone implementation overriding the category? I've tried using other categories (AVAudioSessionCategoryMultiRoute, etc), but as soon as the Microphone is used, my setting gets clobbered.

Thanks.

edit: I 'solved' this by explicitly setting the category on app startup as well as AFTER I finish recording with the microphone.

 

Yep, I was using AVAudioSessionCategoryPlayAndRecord originally, but it was still getting clobbered. I also noticed the volume (even at max setting) was noticeably more quiet than usual.

Using AVAudioSessionCategoryPlayback put my app at the same volume level as all other apps, and since I have to explicitly call it after microphone recording anyways due to the clobbering issue, this was the setting I chose.