Ask HN: Is there any up-to-date guide to resources for learning iOS?

I know I could google the answer myself but I get so many different opinions and recommendations on this subject. So, I'd like to ask the trusted HN community. I basically need the first three resources which are up-to-date and I should check out right now. About me: I am not new to software development and dived once into Objective-C for some weeks (but years ago). Thanks.