OOPer. I have a lot of classes (let's name them data processors). User may select one, and I need to save this selection and later use an instance of this class. Now I'm saving the class name as NSStringFromClass. Thanks, I will be grateful for ideas.

Much less, about 50. Maybe just make a function that will give the instance from name? Like this https://gist.github.com/Higher08/d54e07ac752884a5e615f15bc7e73ba0