Lots of frameworks were built when object-orientation were all the rage. I'm not going to insist on avoiding them just because the APIs were designed to be inhe

Lots of frameworks were built when object-orientation were all the rage. I'm not going to insist on avoiding them just because the APIs were designed to be inherited from. To use a concrete example, it's going to be real hard to build an iOS app without inheriting from UIView at some point.