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removeObserver(_:forKeyPath:)

Raises an exception.

Declaration

func removeObserver(_ observer: NSObject, forKeyPath keyPath: String)

Parameters

  • observer:

    The object to remove as an observer.

  • keyPath:

    A key-path, relative to the set, for which observer is registered to receive KVO change notifications. This value must not be nil.

Discussion

NSSet objects are not observable, so this method raises an exception when invoked on an NSSet object. Instead of observing a set, observe the unordered to-many relationship for which the set is the collection of related objects.

See Also

Key-Value Observing