Sets the current audio session category.
- iOS 3.0+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
The audio session category to apply to the audio session. See Audio Session Categories for supported category values.
true if the audio session category and options were set successfully, or
The audio session's category defines how the app intends to use audio. Typically, you set the category before activating the session. You can also set the category while the session is active, but this results in an immediate route change.