A pointer to an Objective-C foreign object.
A string or
nil
.
A pointer to an Objective-C foreign object or
nil
.
A notification center.
The function
remove-observer
calls the Objective-C instance method
"removeObserver:name:object:"
of
centre
to remove
target
as an observer with the given
name
and
object
, which both default to
nil
.
If center is omitted then it defaults to the default notification center.