Extract Category is a refactoring in Objective-C that helps you extract a category from an existing class and update all usages of extracted members across the whole project or workspace.

For example, for the method below press &shortcut:Refactorings.QuickListPopupAction; and select Category action. In the dialog that opens, type a category name and select members of the current class that should be moved to the new category:

The new category will be created based on the selected members.