onWillDetach
fun onWillDetach(validity: LifecycleListener.Validity = LifecycleListener.Validity.Infinite, listener: () -> Unit): CancellationToken
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Registers listener for the WillDetach event.
NOTE: Listener is not called if this instance is already detached.
Parameters
validity
Specify how many events should the listener receive. Defaults to an infinite validity.