I am not really a UML-User and relatively new to OO-Programming, i just used UML if i had to and it is long ago. Now i had to write an iPhone-Software and dont really know, how to realize Messages and Protocolls in an UML-Diagramm.
And.. did i understand it in the right way, that in Objective-C is just one kind of inheritance ? You can just extend the Root-Class (and of couse instanciate) ?
It seems to me, that Objective-C is not really conform to some aspects of the UML-Concept.