Value Change Enum
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An enumeration indicating the type of change occurring in the WillChangeValue(String) and DidChangeValue(String) methods.
public enum NSKeyValueChange
type NSKeyValueChange =
The change being reported is an insertion into a collection.
The change being reported is a removal from a collection.
The change being reported is a set of changes in a collection.
The change is reported for setting a value in a property.