Personally, I had to take a different route than online videos/tutorials. Between doing web development full-time and having a family at home, I couldn't find the time to focus on becoming competent at iOS development.

So I took a week off and went to Chicago for one of the Pragmatic Studios courses (http://pragmaticstudio.com). Being able to focus on that was exactly what I needed.

YMMV of course, but I thought I'd throw in an alternate option.