Instance Method

removeObserver(_:fromObjectsAt:forKeyPath:context:)

Raises an exception.

Declaration

func removeObserver(_ observer: NSObject, fromObjectsAt indexes: IndexSet, forKeyPath keyPath: String, context: UnsafeMutableRawPointer?)

Parameters

observer

The object to remove as an observer.

indexes

The index set.

keyPath

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

context

The context passed to the notifications.

Discussion

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

See Also

Key-Value Observing

func addObserver(NSObject, toObjectsAt: IndexSet, forKeyPath: String, options: NSKeyValueObservingOptions = [], context: UnsafeMutableRawPointer?)

Registers an observer to receive key value observer notifications for the specified key-path relative to the objects at the indexes.

func removeObserver(NSObject, fromObjectsAt: IndexSet, forKeyPath: String)

Removes anObserver from all key value observer notifications associated with the specified keyPath relative to the array’s objects at indexes.