This was added in Xcode 4.3 and works down to 10.6.8 I believe.

The aim of course is to have a concise public interface for a class that exposes only the necessary API (interface) for using the class as necessary. This however was not possible as all member variables and properties had to be declared in the public header file. With the update to Objective-C member variables and properties can be moved into a class extension or into the implementation section of the class.

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