This directory contains header files that define action protocols. Functionally these protocols are used to add application-specific methods to UIResponder, to allow controls to send action messages up the responder chain.
These protocols headers are in this directory because, although they relate to specific UI features (settings, toolbar, etc), they will be used by different UI components, and should be independent of any specific UI implementation.
Classes that instantiate controls that send the methods in one of these protocols will need to import the header for that protocol, but won't need to conform to it.
Classes in the responder chain that handle any of these methods need to conform to the protocol.
These protocols are specifically for use in the UI-layer target/action context, and shouldn't be used for other purposes. The sender parameter of any of these methods should always be an actual UIControl instance that the user is interacting with.