A mask describing the kinds of edits pending for the text storage object.
- iOS 7.0+
- macOS 10.0+
- tvOS 9.0+
This property indicates pending changes for attributes, characters, or both. Use the C bitwise AND operator to test the value against the
edited constants; testing for equality will fail if additional mask flags are added later. The text storage object’s associated delegate and layout managers can use this information to determine the nature of edits in their respective notification methods.