You may be interested in libextobjc

[onmyway133]

libextobjc

Concrete protocols, using EXTConcreteProtocol, for providing default implementations of the methods in a protocol.

[sunnyxx]

Yes, we have fun with libextobjc too, lots of codes are based on EXTConcreteProtocol, this repo is built for exercising and provides a better usage like @defs and separated implementations. Thanks.