Ask HN: I want to go from 0 to iOS Developer

Hi guys, I am currently a self-employed graphic designer / video editor / marketer consulting for various companies. I have been doing this for years.

So, if I have what I think is a great app idea (I have several actually) but don't really know much about coding except what I learned in QBasic when I was in high school a long time ago, where would y'all suggest I start learning how to make apps for iOS? (I don't have an android or know much at all about it)

I've heard of treehouse and codeacademy to start from nothing, but I'm wondering if you guys could suggest something better?