Losing “Now Playing” status from MPRemoteCommandCenter

问题

I am creating an application for iOS that can be controlled using the MPRemoteCommandCenter. This works fine.

When changing the application AVAudioSession category from AVAudioSessionCategoryPlayback to AVAudioSessionCategoryPlayback, withOptions: .MixWithOthers, it stops receiving remote control events. This is fine.

But when I change the category back to AVAudioSessionCategoryPlayback, I do not receive events from MPRemoteCommandCenter as expected.

How can I reclaim "Now Playing" status for my application?

回答1:

I did discover that when setting AVAudioSessionCategory the options are retained. So by calling setCategory(AVAudioSessionCategoryPlayback, withOptions: .MixWithOthers) first and then setCategory(AVAudioSessionCategoryPlayback) later, the .MixWithOthers option was always in effect.

I was unable to find a AVAudioSessionCategoryOptions.None option, but supplying an empty array did reset the category options.

.setCategory(AVAudioSessionCategoryPlayback, withOptions: [])

来源：https://stackoverflow.com/questions/32284272/losing-now-playing-status-from-mpremotecommandcenter