Static AVAudioUnitComponentManagerRegistrationsChangedNotification 

pub unsafe static AVAudioUnitComponentManagerRegistrationsChangedNotification: &'static NSNotificationName

Available on crate feature AVAudioUnitComponent only.

A notification generated when AVAudioUnitComponentManager updates its list of components.

Register for this notification on the shared AVAudioUnitComponentManager instance, as follows:

[[NSNotificationCenter defaultCenter] addObserver: myObject
selector:
sel!(registrationsChanged:)
name:        AVAudioUnitComponentManagerRegistrationsChangedNotification
object:      [AVAudioUnitComponentManager sharedAudioUnitComponentManager]];

See also Apple’s documentation