Call class method of Objective C category

Question

AFNetworking has a class method called + af_sharedImageCache that I want to access from my own category, but I can't figure out the syntax to reference this. Internally it is doing [[self class] af_sharedImageCache] but obviously that's not gonna work for me. :)

Answer 1

That's because + af_sharedImageCache is a private method, not exposed on UIImageView+AFNetworking.h. You can call it, though, using Obj-C runtime.

if ([[self class] respondsToSelector:@sel(af_sharedImageCache)]) {
     NSCache *cache = [[self class] performSelector:@sel(af_sharedImageCache)];
}

However, AFImageCache is a private class, and you would have to do the same hack to use its methods. If I were you, I'd create my own cache, as it's clear that AFNetworking doesn't want that you mess with its cache implementation.